This patent application claims the benefit of priority to U.S. Patent Application Serial No. 13/827,779, filed March 14, 2013, which claims priority to U.S. Provisional Patent Application Serial Number 61/734,820, filed on December 7, 2012, which applications are hereby incorporated by reference herein in their entirety.

COPYRIGHT NOTICE

A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever. The following notice applies to the software and data as described below and in the drawings that form a part of this document: Copyright Raven Industries, Inc.; Sioux Falls, SD. All Rights Reserved.

TECHNICAL FIELD

This document pertains generally, but not by way of limitation, to balloons and inflatable bladders having atmospheric applications.

BACKGROUND

Lobed balloons are used in high altitude ballooning. The shape of the lobed balloon has a relatively high curvature that allows for larger diameter balloons using relatively thin material for the balloon material. In at least some examples, payloads including instruments, communications equipment and the like are coupled with or suspended from the lobed balloon. The payloads are configured to conduct operations (e.g., observation, communication and the like) at the high altitudes lobed balloons reach, for instance an altitude of 20 miles. Examples of lobed balloons are constructed with a lightweight material that is provided in diamond shaped panels of material (a gore pattern) that extend from top end to a bottom end and taper from near a midpoint toward the top and bottom ends. The diamond shaped panels are bonded to one another along their respective longitudinal edges to form the balloon. The balloon accordingly has a plurality of longitudinal seams extending from the top to the bottom of the balloon (one seam for each of the diamond shaped panels). The wider midpoint of each of the diamond shaped panels provides the outwardly curving shape of the balloon with respect to the narrower top and bottom ends. Optionally, a balloon is constructed with an upper and a lower panel coupled together along an edge.

In other examples of balloons a nested inner balloon, a ballonet, is provided within a larger balloon (e.g., a balloon within a balloon). The ballonet is coupled at an end of the larger balloon, for instance the bottom end of the larger balloon, and has a roughly spherical shape that fills at least a portion of the larger balloon. The ballonet (inner balloon) is inflated within the larger balloon. Inflation and deflation of the ballonet with atmospheric air provides ballast to the larger balloon by minimizing the remaining volume of the larger balloon dedicated to a lighter than air gas that provides buoyancy.

OVERVIEW

The present inventors have recognized, among other things, that a problem to be solved can include minimizing the bonding and corresponding generation of multiple seams in a high altitude balloon. Further, the inventors have recognized that a problem to be solved can include reducing time consuming and labor intensive assembly of a plurality diamond shaped (gore) panels to form a high altitude balloon.

In an example, the present subject matter can provide a solution to this problem, such as by coupling an upper liable balloon panel having the upper apex of the balloon with a lower pliable balloon panel having the lower apex of the balloon. The upper and lower pliable balloon panels are coupled together at a circumferential edge of the balloon, as opposed to a plurality of longitudinal seams as with gore patterned balloons. The circumferential edge provides a single edge for bonding, stitching or the like, and accordingly avoids the time consuming and labor intensive alignment and bonding of each of a plurality of diamond shaped (gore) panels along their respective longitudinal edges.

Additionally, the preassembly of the upper and lower pliable balloon panels is conducted in a single step by aligning the edge of the upper pliable balloon panel with corresponding edge of the lower pliable balloon panel.

The present inventors have further recognized, among other things, that a problem to be solved can include the minimizing of weight of a high altitude balloon. For instance, balloons that include a ballonet provide a nested balloon (ballonet) within the overall larger balloon. The nested balloon has a spherical or near spherical shape and is coupled with the larger balloon at a location within the larger balloon. Accordingly, the larger overall balloon and the nested balloon each include dedicated panels of material used to form each of the respective balloons. Stated another way, a high altitude balloon includes balloon material not only for the larger overall balloon, but for the inner nested balloon as well.

In an example, the present subject matter can provide a solution to this problem, such as by providing a deflectable diaphragm within the balloon. The deflectable diaphragm is coupled along the circumferential edge of the upper and lower pliable balloon panels. The deflectable diaphragm accordingly separates the overall larger balloon into dual chambers (e.g., a dual chamber balloon). The deflectable diaphragm and an interior surface of the dual chamber balloon form a lift gas chamber and a separated air ballast chamber. Each of the chambers, including the air ballast chamber, is formed by the diaphragm and the dual chamber balloon. Stated another way, a dedicated balloon having its own spherical or near spherical shape (with corresponding dedicated material) is avoided. Instead, each of the lift gas chamber and the air ballast chamber are formed in part from the dual chamber balloon. The weight of the overall dual chamber balloon is according minimized while at the same time providing a functional air ballast chamber.

This overview is intended to provide an overview of subject matter of the present patent application. It is not intended to provide an exclusive or exhaustive explanation of the invention. The detailed description is included to provide further information about the present patent application. BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. Like numerals having different letter suffixes may represent different instances of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed in the present document.

Figure 1 is a perspective view of one example of a dual chamber balloon in an inflated configuration.

Figure 2 is a schematic diagram of the dual chamber balloon of Figure 1. Figure 3 are dual schematic views of the dual chamber balloon of Figure 1 and a balloon including a nested ballonet.

Figure 4 is a detailed view side view of the circumferential edge between upper and lower pliable balloon panels, with a plurality of tendons retained in a circumferential anchor.

Figure 5 is a perspective view of one example of a pressure control valve and a deflation port coupled with the dual chamber balloon.

Figure 6 is a perspective view of one example of a propulsion system. Figure 7 is an exploded view of a plurality of pliable panels coincidently aligned in a stacked configuration prior to assembly of the dual chamber balloon.

Figure 8 is a block diagram showing one example of a method of making a dual chamber balloon.

Figure 9 is a schematic view of one example of a remote launch system configured to remotely inflate and launch a dual chambered balloon.

Figure 10 is a perspective view showing one example of a remote

disconnect coupling.

Figure 11 is a block diagram showing one example of a method for using a dual chamber balloon.

DETAILED DESCRIPTION

Figure 1 shows one example of a high altitude balloon system 100. As shown the high altitude balloon system 100 includes a dual chamber balloon 102 (e.g., a pumpkin balloon or lobed balloon) coupled with a payload 104 and an optional propulsion system 106, for instance by one or more suspension lines 108. In the example shown in Figure 1 the dual chamber balloon 102 is formed between an upper apex 110 and a lower apex 112. For instance, the dual chamber balloon 102 includes an upper balloon panel 114 extending from the upper apex 110 to a circumferential edge 120. A lower balloon panel 116 extends from the lower apex 112 to the circumferential edge 120. As will be described herein, in one example the upper and lower balloon panels 114, 116 are provided as discs or portions of discs and are accordingly sealed along the circumferential edge 120. Referring again to Figure 1 the payload 104 is shown suspended beneath the dual chamber balloon 102 for instance on one or more suspension lines 108. In one example the payload 104 includes one or more of instruments, communication devices and the like configured to provide additional functionality to the high altitude balloon system 100. In one example, the high altitude balloon system 100 with the payload 104 is configured to provide observation beneath and around the high altitude balloon 100 as well as one or more communication features (e.g., transmission of information, reception of information and the like). In another example, the payload 104 comprises a framework suspended beneath the high altitude balloon system 100 including for instance an air ballast blower configured to provide atmospheric air to the air ballast chamber such as the air ballast chamber 126, a source of lighter- than-air gas configured to provide lighter-than-air gas (e.g., a lift gas such as helium or hydrogen) to a lift gas chamber 124 and the like. In another example the payload 104 includes a controller sized and shaped to control the relative volume of each of the dual chamber balloon chambers for instance the lift gas chamber 124 and the air ballast chamber 126 as will be described herein.

As further shown in Figure 1, an optional propulsion system 106 is coupled with the high altitude balloon system 100. In one example the propulsion system 106 provides one or more sources of propulsion for instance propellers, guidance fins or the like as well as a power source configured to operate a motorized portion of the propulsion system such as one or more propellers. As will be described herein, in one example the propulsion system 106 includes two or more propellers optionally positioned away from the center of gravity of the high altitude balloon 100. The two or more propellers are thereby able to provide counteracting or cooperative torques to the high altitude balloon system 100 for instance the dual chamber balloon 102 to rotate the dual chamber balloon 102 and accordingly reorient the propulsion system 106 to provide at least limited directional control and propulsion to the high altitude balloon system 100.

Referring again to the view shown in Figure 1, the dual chamber balloon 102 as previously described is formed in one example with upper and lower balloon panels 114, 116. Each of the upper and lower balloon panels 114, 116 cooperate to form a balloon outer surface 121. For instance, as shown the upper and lower balloon panels 114, 116 are coupled along a circumferential edge 120 for instance along a seam or edge seal provided by adhering, bonding, melting or the like the upper and lower balloon panels 114, 116 to each other along the circumferential edge 120. As further described herein, the dual chamber balloon 102 further includes a lift gas chamber 124 separated from an air ballast chamber 126.

The lift gas chamber and air ballast chamber 124, 126 are separated by way of a deflectable diaphragm 118 positioned within the dual chamber balloon 102. For instance, as shown in Figure 1 the deflectable diaphragm 118 is coupled across the dual chamber balloon 102 and extends from the

circumferential edge 120. In one example the deflectable diaphragm 118 is interposed between the upper and lower balloon panels 114, 116 at the time of construction of the dual chamber balloon 102. Accordingly as the

circumferential edge 120 (e.g., a seam or edge seal) is formed the deflectable diaphragm 118 is coupled with each of the upper and lower balloon panels 114, 116 to accordingly form a triple layered dual chamber balloon 102 having the deflectable diaphragm 118 such as a pliable diaphragm panel interposed and coupled with each of the upper and lower balloon panels 114, 116. Accordingly the lift gas chamber 124 is formed by the upper balloon panel 114 and the deflectable diaphragm 118. That is to say the lift gas chamber 128 is formed by the balloon outer surface 121 (the portion of the balloon outer surface including the upper balloon panel 114) as well as the deflectable diaphragm 118. In a similar manner, the air ballast chamber 126 is formed by the balloon outer surface 121 (that portion of the outer surface including the balloon panel 116) in cooperation with the deflectable diaphragm 118. Stated another way, each of the lift gas chamber 124 and the air ballast chamber 126 are cooperatively formed by the balloon outer surface 121 and the deflectable diaphragm 118.

Accordingly a separate ballonet or nested balloon within the dual chamber balloon 102 is not required. The deflectable diaphragm 118 minimizes the amount of material otherwise used for a ballonet and provides a lightweight separating feature for each of the lift gas chamber and the air ballast chamber 126 that is incorporated into the construction of the dual chamber balloon 102 (e.g., by interposition of the deflectable diaphragm 118 or coupling of the deflectable diaphragm 118 along the circumferential edge 120).

Optionally the deflectable diaphragm 118 is constructed with a piece of material having a similar or identical size to each of the upper and lower balloon panels 114, 116. Accordingly, as the dual chamber balloon 102 is inflated and put into operation the deflectable diaphragm 118 is deflectable within the dual chamber balloon 102 for instance within a dual chamber balloon volume to accordingly allow adjustment of each of the corresponding volumes of the lift gas chamber 124 and the air ballast chamber 126. That is to say the deflectable diaphragm 118 in one example allows for adjustment of each of the lift gas chamber volume and the ballast chamber volume from between 0 and 100 percent of the total dual chamber balloon volume (the dual chamber balloon volume being substantially constant throughout operation of the high altitude balloon system 100). In another example, one of the chambers 124, 126 has a smaller maximum proportion of the total dual chamber balloon volume (e.g., less than 100 percent, such as 10 percent or more). Accordingly, the other of the two chambers 124, 126 fills the remainder of the volume.

In another example, the deflectable diaphragm 118 is coupled across another portion of the balloon. For instance, the deflectable diaphragm 118 has a smaller perimeter than either of the upper or lower balloon panels, and is accordingly coupled to either of the panels closer to either of the upper or lower apexes 110, 112, respectively. In still another example, the deflectable diaphragm is provided as a nested balloon formed of a light weight membrane within the dual chamber balloon 102. For instance, the diaphragm is coupled with the balloon 102 at one of the upper or lower apexes.

As further shown in Figure 1, in one example a plurality of tendons 122 extend from the upper apex 110 to the lower apex 112. The plurality of tendons 122 are provided in a distributed fashion around the dual chamber balloon 102 and are accordingly provided to provide structural integrity to the dual chamber balloon 102 and maintain the dual chamber balloon volume at a constant level after inflation and during operation of the high altitude balloon system 100. As will be described herein, in one example the tendons 122 are cables, biodegradable filaments or the like fed through a plurality of orifices within the circumferential edge 120 to accordingly maintain the tendons 122 in a distributed fashion around the balloon outer surface 121. Accordingly the feature of the dual chamber balloon 102, such as the circumferential edge 120 incorporating the seam of each of the upper and lower balloon panels 114, 116 as well as the deflectable diaphragm 118, is in another example used as the anchoring or retaining feature to accordingly feed the tendons 122 there through and maintain the tendons 122 in a distributed fashion around the dual chamber balloon 102. In still another example, the plurality of tendons 122 include other features, for instance, an adhesive tape extending across the balloon outer surface 121. The tendons 122 are continuously or intermittently adhered along the outer surface 121 (e.g., from the upper to the lower apexes 110, 112) to enhance the structural integrity of the balloon and accordingly constrain expansion of the balloon 102 beyond the desired dual chamber balloon volume.

Figure 2 shows a schematic view of the high altitude balloon system 100 previously shown in Figure 1. In this example the payload 104 is shown suspended beneath the dual chamber balloon 102, for instance by one or more suspension lines 108. In another example, the payload 104 is coupled directly with the dual chamber balloon 102, for instance at a fitting of the lower apex 112. As shown in the example of Figure 2, the payload 104 in one example includes a source of lighter- than- air gas 200. The source of lighter- than- air gas (e.g., one or more tanks or reservoirs of helium or hydrogen) is in

communication with the lift gas chamber 124. That is to say, in one example an inflation tube or the like extends around or through the dual chamber balloon 102 to accordingly provide communication between the source of lighter-than- air gas 200 and the lift gas chamber 124. The source of lighter- than- air gas 200 optionally includes one or more tanks of helium, hydrogen or another light-than- air gas configured to accordingly inflate and maintain the lift gas chamber 124 at a desired altitude. Accordingly, as the lift gas chamber 124 deflates during operation for instance through permeation of the balloon outer surface 121 or active deflation of the lift gas chamber 124 the source of lighter-than-air gas 200 is configured to accordingly re-inflate the lift gas chamber 124 to a desired inflation volume (e.g., by operation of a control valve or other system optionally in communication with the control 204 described herein).

In a similar manner the air ballast chamber 126 is in one example in communication with an air ballast blower 202 provided with the payload 104 for instance a framework suspended beneath the dual chamber balloon 102 (or optionally coupled with the balloon 102 adjacent to the lower apex 112). In a similar manner to the source of lighter-than-air gas 200 the air ballast blower 202 is configured to provide supplemental air (or other ambient environmental gas) to the air ballast chamber 126 to accordingly allow for maintenance (or increasing) of the ballast chamber volume relative to the total volume of the dual chamber balloon 102.

In one example the air ballast blower 202 is controlled for instance by a controller 204 to accordingly inflate and deflate as needed to thereby adjust the altitude of the dual chamber balloon 102 during its operation. As shown for instance in Figure 2 the deflectable diaphragm 118 deflects upwardly or downwardly with corresponding inflation and deflation of the air ballast chamber 126. For instance, in one example the controller 204 is configured to adjust the overall volume ratio between the air ballast chamber 126 and the lift gas chamber 124 relative to a substantially constant dual chamber balloon volume by operation of the air ballast blower 202. That is to say, by inflating and deflating the air ballast chamber 126 the corresponding volume of the lift gas chamber 124 is conversely adjusted to accordingly maintain the dual chamber balloon 102 at a static altitude, provide ascent, descent or the like.

As further shown in Figure 2, in one example the dual chamber balloon 102 includes a pressure control valve 206 in combination with an optional deflation port 208. As shown, the pressure control valve 206 and the deflation port 208 are in one example provided at the upper apex 110 of the dual chamber balloon 102 as a unitary feature. The pressure control valve 206 is operated to accordingly maintain or change the pressure within the dual chamber balloon 102 for instance within the lift gas chamber 124. For instance, as a pressure within the lift gas chamber 124 rises or a pressure within the total volume of the dual chamber balloon for instance across each of the air ballast chamber 126 and the lift gas chamber 124 rises above a threshold pressure the pressure control valve 206 is operated either actively or automatically according to a mechanism or controller (e.g., the controller 204) to accordingly open and relieve pressure from within the dual chamber balloon 102. One example of an active pressure control valve 206 is described herein.

As further shown in Figure 2 a deflation port 208 is optionally provided at the upper apex 110. The deflation port 208 is configured to rapidly deflate the dual chamber balloon 102 (e.g., the lift gas chamber 124) and accordingly facilitate the rapid descent of the high altitude balloon system 100 for instance upon the end of its operational lifetime. One example of a deflation port 208 is described herein.

In another example and as shown in Figure 2, the dual chamber balloon 102 includes a remote disconnect coupling 210. The lift gas chamber 124 is inflated prior to operation with a reactive gas, such as hydrogen. The remote disconnect coupling 210 allows for remote inflation and a later remote disconnection of an inflation tube from the dual chamber balloon 102 without requiring user operation adjacent to the dual chamber balloon. For instance, the remote disconnect coupling 210 includes a mechanism (pneumatic, hydraulic or the like) thereon to automatically or upon a controller received input release the gas infusion tubing from the dual chamber balloon 102 and thereby facilitate the deployment of the high altitude balloon system 100 remotely without requiring adjacent user input.

Figure 3 shows dual schematic views of balloons. The first view shows the dual chamber balloon 102 previously described herein. For instance, the dual chamber balloon 102 includes the deflectable diaphragm 118 shown in a variety of positions. A first position is shown with the diaphragm in solid lines and positioned approximately across the midpoint of the dual chamber balloon 102. Accordingly, the lift gas chamber 124 and the air ballast chamber 126 comprise substantially equal components of the overall dual chamber balloon volume. In a second position, the deflectable diaphragm 118 is shown deflected relatively upward (and in dashed lines) to accordingly decrease the lift gas chamber volume while at the same time the air ballast chamber volume is increased. As previously described, the component volumes of the air ballast chamber 126 and the lift gas chamber 124 when summed are substantially equal to the overall dual chamber balloon volume. Accordingly, with deflection of the deflectable diaphragm 118 into the upper position the lift gas chamber volume is minimized by the increased ballast chamber volume to accordingly facilitate descent of the high altitude balloon system 100 for instance to a desired altitude. Similarly, with deflection of the deflectable diaphragm 118 into a lower position (also shown in dashed lines in Figure 3) the air ballast chamber volume is accordingly decreased and the lift gas chamber volume is accordingly increased. The dual chamber balloon 102 accordingly increases in buoyancy and the high altitude balloon system 100 is thereby raised or ascends to a desired altitude.

Referring now to the second view of Figure 3, another example of a balloon 300 is provided. In this example the balloon 300 includes a lift gas chamber 302 and a ballonet 304 positioned therein. As shown the ballonet 304 is a nested balloon within the overall balloon 300. That is to say, the ballonet 304 comprises a separate sheet of material extending from for instance a lower apex of the balloon 300 to provide a separate balloon from the balloon 300. The ballonet perimeter 306 accordingly extends around substantially the entire balloon 300. Inflation of the ballonet 304, for instance with air or another heavier gas allows for a decrease of the overall volume of the lift gas chamber 302. Accordingly, with inflation and deflation of the ballonet 304 the balloon 300 is able to ascend or descend.

In contrast to the dual chamber balloon 102 previously described herein and further shown in the first view of Figure 3, the ballonet 304 comprises a separate sheet of material and accordingly a separate balloon formed within the balloon 300. Instead of having the sheet of material for instance coupled across the dual chamber balloon 102 (e.g., at the circumferential edge or some other location within the balloon between the upper and lower apexes 110, 112) an entirely separate sheet of material must be provided to the balloon 300 to accordingly provide an inner or nested balloon. The ballonet perimeter 306 is accordingly substantially larger than the deflectable diaphragm 118 shown for instance in Figures 1, 2 and the first view of Figure 3. Stated another way, the ballonet 304 does not rely on the balloon 300 to form an air ballast chamber 126. Instead, the ballonet 304 by itself forms a ballast chamber within the overall balloon 300. This dedicated chamber is accordingly not a part of the overall perimeter of the balloon 300. Instead a separate sheet of material with corresponding additional weight, coupling features between the ballonet 304 and the balloon 300 are provided. The balloon 300 is accordingly heavier and in at least some regards more difficult to construct than the dual chamber balloon 102 as described herein. For instance in one example the balloon 300 is formed with a plurality of gore panels or diamond shaped longitudinal panels extending from upper and lower apexes. An orifice is left in the balloon 300 to accordingly allow for feeding of the ballonet 304 into the balloon 300. The ballonet 304 is thereafter coupled at the lower apex of the balloon 300 for instance by one or more of stitching, sealing or the like.

In contrast to the balloon 300, the dual chamber balloon 102 provides the lift gas chamber 124 and the air ballast chamber 126 both as integral components to the dual chamber balloon 102 (e.g., formed in part by the balloon outer surface 121). For instance, each of the lift gas chamber 124 and the air ballast chamber 126 are cooperatively formed by the balloon outer surface 121 as opposed to a separate ballonet 304 as is the case with the balloon 300. The deflectable diaphragm 118, for instance a thin sheet of material interposed between the upper and lower balloon panels 114, 116, provides the separation between the lift gas chamber 124 and the air ballast chamber 126. The deflectable diaphragm 118 separates the chambers without requiring the significant amount of material needed to form a ballonet 304 shown in Figure 3. Instead, the deflectable diaphragm 118 is incorporated into the construction and assembly of the dual chamber balloon 102 for instance by coupling of the deflectable diaphragm along the circumferential edge 120 (e.g., through incorporation within a seam or an edge seal). Accordingly each of the lift gas chamber 124 and the air ballast chamber 126 are cooperatively formed by the balloon outer surface 121 as well as the deflectable diaphragm 118. A nested balloon such as the ballonet 304 having increased material and additional weight relative to the deflectable diaphragm 118 is thereby not needed in the design of the dual chamber balloon 102.

Figure 4 shows one example of a tendon 122, for instance one of a plurality of the tendons previously shown in Figure 1. As shown the tendon 122 extends over a portion of the upper balloon panel 114 through a portion of the circumferential edge 120 and across the lower balloon panel 116. As previously described each of the tendons 122 in one example extends from the upper apex 110 to the lower apex 112 shown in Figure 1. Referring now to Figure 4 the representative tendon 122 is shown extending through the circumferential edge 120. In one example the circumferential edge 120 includes a circumferential retaining feature 400 provided therein (e.g., an anchoring orifice, mechanical fitting or the like). In one example, the circumferential retaining feature 400 is a separate piece of material incorporated into the circumferential edge 120 during construction of the dual chamber balloon 102. In another example, the circumferential anchor 400 is comprised of the laminated or coextruded materials of the upper and lower balloon panels 114, 116 (and optionally the deflectable diaphragm 118). As shown for instance in Figure 4 one or more retaining orifices 402 are provided through the circumferential retaining feature 400. The tendons 122 are fed through each of these retaining orifices 402 to accordingly position each of the tendons 122 circumferentially around the circumferential edge 120. As shown in Figure 1, the plurality of tendons 122 are provided in a distributed fashion around the dual chamber balloon 102. The circumferential retaining feature 400 (optionally part of the circumferential edge 120) maintains the plurality of tendons 122 in this distributed arrangement.

In one example each of the plurality of tendons 122 are substantially non- pliable to accordingly ensure support is provided to the dual chamber balloon 102, for instance during operation and inflation of the dual chamber balloon. The tendons 122 as shown in Figure 1 extend from the upper and lower apexes 110, 112. Accordingly the tendons 122 decrease hoop stress within the material of the dual chamber balloon 102 (e.g., in the upper and lower balloon panels 114, 116) and substantially constrain and thereby minimize or eliminate deflection of the balloon material (either of the panels 114, 116) during operation or inflation. Optionally, the plurality of tendons 122 are constructed with a material that is biodegradable. For instance as the high altitude balloon system 100 reaches the end of its operational lifetime the dual chamber balloon 102 is deflated thereby allowing the high altitude balloon system 100 to rapidly descend. Accordingly the tendons 122 are constructed in one example with a biodegradable material and upon deflation and depositing of the high altitude balloon system 100 (at ground level) the plurality of tendons 122 are configured to biodegrade wherever they may land. In still another example, the plurality of tendons 122 include an adhesive tape intermittently or continuously coupled along the dual chamber balloon 102, for instance between the upper and lower apexes 110. 112.

Figure 5 shows a perspective view of an assembly of the pressure control valve 206 and the deflation port 208 previously shown for instance in the schematic view of Figure 2. Referring first to the pressure control valve 206, as shown in one example the pressure control valve 206 is housed within a valve tower 520 provided as part of the deflation port 208. For instance, the valve disc 514 is positioned within a portion of a valve flapper 502 of the deflation port 208. The valve disc 514 is movable in an upward and downward manner, for instance by operation of a valve arm 516 coupled and operated with a valve operator 518 (e.g., a motor configured to provide reciprocating motion such as by a crank that translates the valve arm 516). The valve operator 518 is coupled at one end of the valve tower 520 and accordingly moves the valve arm 516 in an upward and downward manner to accordingly close and open the valve disc 514 as needed for maintenance of a desired pressure or relief of pressure within the lift gas chamber 124 as shown in Figures 1 and 2. In one example, the valve operator 518 is coupled with or includes a communication device such as receiver or transceiver therein configured to communicate with the controller 204 to accordingly operate or cycle the valve arm 516 and the valve disc 514 to relieve or maintain pressure within the lift gas chamber 124 as needed for operation of the high altitude balloon system 100.

Referring again to Figure 5, one example of a deflation port 208 is shown. The deflation port 208 includes a valve ring 500 housing a valve flapper 502 therein. In one example, the valve ring 500 has a diameter of approximately eight to ten inches to accordingly allow (after opening of the valve flapper 502) rapid deflation of the lift gas chamber 124 to provide rapid descent of the high altitude balloon system 100.

Referring again to Figure 5, the valve flapper 502 is shown in a closed position where the valve flapper 502 is seated along the valve ring 500 (for instance the valve ring 500 has a deflectable seal such as a rubber seal, butyl seal or the like). As further shown in Figure 5 the deflation port 208 further includes a system configured to maintain the valve flapper 502 in the closed position until such time that deflation of the dual chamber balloon 102 is desired. In the example shown a retaining feature 506 such as a cable, wire or the like extends across the valve ring 500 for instance over top of the valve tower 520 through a one or more eyelets. The retaining feature 506 is retained at either side of the valve ring 500 and accordingly holds the valve flapper 502 in the closed position. At least one flapper biasing element 504 is coupled between a portion of the valve ring 500 and a corresponding centrally mounted portion of the valve flapper 502. In the example shown in Figure 5 the flapper biasing element 504 is coupled with the valve tower 520 and accordingly provides a moment to the valve flapper 502 that (without constraint of the valve flapper 502 by the retaining feature 506) allows the valve flapper to open.

The retaining feature 506 as shown herein further includes a destructible link 508 configured to sever at least a portion of the retaining feature 506 and thereby allow operation of the flapper biasing element 504. In the example shown a destructible link 508 includes a receiver 510 coupled with a severing element 512. The severing element 512 includes, but is not limited to, a heater configured to melt a link of the retaining feature 506, a cutting element or the like. The receiver 510 is in communication with the severing element 512 and upon the receipt of a severing signal the severing element 512 is operated to fracture the destructible link 508 (e.g., cut, melt or the like) and thereby separate the retaining feature 506. In one example the receiver 510 receives the severing signal from a controller, such as the controller 204 or from a remote location for instance the ground. Severing of the retaining feature 506 accordingly allows the flapper biasing element 504 to rotate the valve flapper 502 freely. Stated another way, the flapper biasing element 504 pulls the valve flapper 502 into the open configuration and thereby allows the valve ring 500 to rapidly pass lighter- than-air gas from the lift gas chamber 124. Accordingly, the lift gas chamber 124 rapidly deflates and the dual chamber balloon 102 rapidly descends to end the operation of the high altitude balloon system 100.

Figure 6 shows one example of the propulsion system 106 previously shown in Figures 1 and 2. As shown, the propulsion system 106 in this example provides dual propellers 600 positioned remotely by way of propeller arm 608 from a central beam 606. As further shown a power source 604 is provided at the end of a central beam 606 relative to each of the propellers 600. As will be described herein, in one example, the power source 604 is movable along the beam 606. As further shown in the example in Figure 6 the propulsion system 106 optionally includes one or more guidance fins 602 positioned proximate to each of the propellers 600. In one example, at least the framework of the propulsion system 106 is constructed with a biodegradable material, such as balsa. At the end of the operational lifetime of the high altitude balloon system 100 the propulsion system 106 is substantially biodegradable and will decompose after the high altitude balloon system 100 is received at the ground. As previously described the propulsion system 106 is optionally suspended below the payload 104, as shown in Figures 1 and 2. In another example, the propulsion system 106 is consolidated with the payload 104, for instance into a single pod suspended from or attached to the dual chamber balloon 102. The propulsion system 106 includes one or more propellers 600. As shown in Figure 6, the propulsion system 106 includes two propellers 600 positioned remotely relative to the central beam 606 by corresponding propeller arms 608. As shown, the propellers 600 are driven by corresponding motors 601 coupled with each of the propellers 600. In one example the motors 601 are coupled with the controller 204. In another example a separate controller or a dedicated controller is provided, for instance with the power source 604, to accordingly consolidate the operational and structural components of the propulsion system 106 into the system shown in Figure 6. In one example where the power source 604 includes a controller for each of the propellers 600 therein the controller of the power source 604 is optionally in communication with the controller 204 shown in Figure 2 or with another remote controller for instance on the ground.

In one example the propellers provide rotation and propulsion to the high altitude balloon system 100. For instance, one of the propellers 600 is operated in reverse relative to the other or at varying speeds to accordingly rotate the dual chamber balloon 102 to a different heading. After positioning the dual chamber balloon 102 along a desired heading for instance with the central beam 606 pointed along the desired heading the propellers 600 are optionally operated in concert (at the same or similar speeds) to accordingly propel the high altitude balloon system 100 in the desired direction. In another example, the guidance fins 602 cooperate with the propellers 600 to accordingly guide the propulsion system 106 and the corresponding high altitude balloon system 100 along a desired path. In still another example the guidance fins 602 include their own actuation features for instance one or more motors, actuators or the like configured to rotate the guidance fins 602 and provide additional control for rotation of the high altitude balloon system 100 and guidance of propulsion provided by the propellers 600.

As described above, in one example, the power source 604 is movably positioned along the central beam 606. For instance, one or more of the central beam 606 or the power source 604 include a drive configured to move the power source 604 along the central member. As the propellers 600 apply thrust to the high altitude balloon system 100 the system pitches upwardly, as the propellers apply a moment near to the lower apex 112 (see Figures 1 and 2). With the system described herein, the power source 604 is translated along the beam 606 to accordingly change the center of gravity of the high altitude balloon system and accordingly offset the moment provided by the propellers 600. Accordingly, thrust delivered to the high altitude balloon system by the propellers 600 is more accurately applied for directional control and guidance without undesirable changes in pitch.

Figure 7 shows an exploded view of each of the upper and lower balloon panels 114, 116 with the interposing deflectable diaphragm 118 (e.g., a pliable diaphragm panel) positioned therebetween. The circumferential edge 120, such as a seal forming the circumferential edges 120 are shown in dashed lines. As previously described in Figure 1, each of the upper and lower balloon panels 114, 116 as well as the deflectable diaphragm 118 are assembled to form a dual chamber balloon 102 having a corresponding lift gas chamber 124 and separated air ballast chamber 126. The deflectable diaphragm 118 is coupled along the circumferential edge 120 to accordingly separate each of the lift gas chamber 124 and the air ballast chamber 126 from one another. Stated another way, the lift gas chamber 124 is in one example formed by the upper balloon panel 114 and the deflectable diaphragm 118 while the air ballast chamber 126 is formed by the lower balloon panel 116 and the deflectable diaphragm 118.

As shown each of the panels 114, 116 (as well as optionally the deflectable diaphragm 118) are provided as discs for instance circular discs oriented in a stacked configuration relative to one another. During assembly each of these discs is placed on top of the other and accordingly sealed or bonded together along the circumferential edge 120 to form the dual chamber balloon 102. Stated another way, in a single manufacturing step the stacked panels 114, 116, 118 are coupled together to form the dual chamber balloon 102 with the lift gas chamber 124 and the air ballast chamber 126. Time consuming stitching or bonding for instance along a plurality of longitudinal seams corresponding to each of one or more diamond configured or gore configured panels is thereby avoided. Further, the deflectable diaphragm is readily incorporated into the circumferential edge.

Optionally, one or more of the panels 114, 116, 118 are provided as one or more quartered or half panel sections 700A-D, 702A-D (and optionally quarter panels for the diaphragm 118). The sections laid on top of one another and then coupled along the circumferential edge 120 to form at least a portion of the balloon 121. Where each of the upper and lower balloon panels 114, 116 are separated into component sections such as the upper panel sections 700A-D and the lower panel sections 702A-D each of the corresponding sections of the upper and lower pliable balloon panels 114, 116 are coupled together along the circumferential edge 120 and then coupled together along the seams between each of the component panels such as the upper panel sections 700A-D and the corresponding lower panel sections 702A-D. Optionally, the order is reversed and the sections 700 A-D, 702A-D (and optionally the diaphragm 118) are coupled along the seams between the panels to form the upper, lower and diaphragm panels 114, 116, 118 and then coupled along the circumferential edge 120.

In another example, because dual panels 114, 116 are used for each of the upper and lower balloon panels 114, 116 each of the panels is constructed with different materials. With the arrangement shown in Figure 7, for instance with the plurality of panels stacked and then coupled together along the circumferential edge 120, different materials are optionally used for each of the panels. For instance, the upper and lower balloon panels 114, 116 are constructed with a thicker layer of material for instance to substantially protect the balloon 102 and prevent the egress of gases from the dual chamber balloon 102. In one example, the upper and lower balloon panels 114, 116 are formed with coextruded layers (accordingly multiple layers) having a thickness of approximately about 3.0 millimeters. Optionally, each of the layers 114, 116 is constructed with a co-extrusion of polyethylene (e.g., two or more layers of polyethylene) with a layer of ethyl vinyl alcohol (EVOH) positioned provided in the coextrusion. In one example the ethyl vinyl alcohol substantially decreases the permeability of each of the upper and lower balloon panels 114, 116 and thereby facilitates the retention of gases within each of the lift gas chamber 124 and the air ballast chamber 126.

In another example, the deflectable diaphragm 118 is constructed with a thinner membrane for instance a membrane having approximately 0.5 millimeters of thickness. The deflectable diaphragm 118 substantially prevents the transmission of gases between each of the lift gas chamber 124 and the air ballast chamber 126 while at the same time easily allowing deflection of the diaphragm. Because the deflectable diaphragm 118 is not a portion of the balloon outer surface 121 the deflectable diaphragm 118 may be constructed with a thinner material that still maintains separation between each of the lift gas chamber 124 and the air ballast chamber 126.

In another example, each of the upper and lower balloon panels 114, 116 is formed with different materials. For instance the upper balloon panel 114, such as an upper pliable balloon panel is configured as a space-facing side of the dual chamber balloon 102 while the lower balloon panel 116 is constructed as a ground or earth-facing side of the dual chamber balloon 102. In one example, the upper balloon panel 114 is constructed with a heat reflective material to accordingly increase the heat reflectivity of the dual chamber balloon 102 relative to a lower heat reflectivity in the lower balloon panel 116. Accordingly heating of the dual chamber balloon 102, for instance by solar radiation, is accordingly attenuated with the heat reflective material. In a contrasting manner, the lower balloon panel 116 is in one example constructed with a heat absorbent material configured to accordingly absorb heat such as heat radiated from the ground. The heat absorbency of the lower balloon panel 116 (e.g., a lower pliable balloon panel) is thereby increased relative to the upper panel 114. The dual chamber balloon 102 with varying heat reflectivity and heat absorbency between the upper and lower panels 114, 116 is able to accordingly attenuate temperature changes during operation in a day and night cycle.

The table provided below provides additional material options that are combinable in one or more permutations according to the particular application of the high altitude balloon system. Each of the upper and lower balloon panels 114, 116, as well as the deflectable diaphragm 118 is optionally constructed with one or more these materials or combinations of these materials. As discussed above, each of the panels is optionally constructed with differing materials (e.g., optionally with some identical constituent components and other differing components).

High Altitude Batioon Panel Material Selection

Base Balloon. Panel Upper Balloon Panel

Polyethylene Metaiized Coating

Nylon White or Light Pigment

Polyester

Sar n Lower Balloon Panel

co-extritston or laminate of one or more Thermal Absorbent Material

Black er Dark Pigment

Other Panel Options

Anti-Static Films or Coatings

Biodegradable Films

EVOH

Figure 8 shows one example of a method 800 for making a high altitude balloon system, such as the system 100 previously shown in Figures 1 and 2. In describing the method 800 reference is made to one or more components, features, functions, steps or the like described herein. Where convenient, reference is made to the components, features, functions, steps and the like with reference numerals. Reference numerals provided are exemplary and are not exclusive. For instance, the features, components, functions, steps and the like described in the method 800 include but are not limited to the corresponding numbered elements, other corresponding features described herein (both numbered and unnumbered) as well as their equivalents.

At 802, the method 800 includes interposing a deflectable diaphragm such as a pliable diaphragm panel between an upper pliable balloon panel 114 and a lower pliable balloon panel 116. In one example, the deflectable diaphragm 118 is shown for instance in Figures 1 and 2 coupled along a circumferential edge between each of the upper and lower balloon panels 114, 116. The upper and lower pliable balloon panels 114, 116 include respective upper and lower apexes 110, 112. The panels extend from the upper and lower apexes to the circumferential edge 120 where they are coupled together.

Accordingly at 804, the method 800 includes forming the dual chamber balloon 102. In one example forming the dual chamber balloon includes coupling the upper pliable balloon panel 114 with the lower pliable balloon panel 116 at the circumferential edge 120 to form a balloon outer surface 121 of the dual chamber balloon 102. As shown in Figures 1 and 2 and previously shown in the exploded view of Figure 7 the upper and lower pliable balloon panels 114, 116 are arranged in a stacked configuration prior to assembly. In another example the upper and lower pliable balloon panels 114, 116 are discs of material and coupling along the circumferential edge 120 correspondingly forms the entirety of the balloon outer surface 121. In another example, where each of at least the upper and lower balloon panels 114, 116 (and optionally the deflectable diaphragm 118) are separated into component sections such as the upper panel sections 700A-D and the lower panel sections 702A-D each of the corresponding sections of the upper and lower pliable balloon panels 114, 116 are coupled together along the circumferential edge 120 and then coupled together along the seams between each of the component panel sections 700A-D, 702A-D.

In another example forming the dual chamber balloon further includes at 808 coupling the deflectable diaphragm 118 to the upper and lower pliable balloon panels 114, 116 at the circumferential edge 120 to form a respective lift gas chamber 124 and an air ballast chamber 126. That is to say, the air ballast chamber 126 is separated from the lift gas chamber 124 by way of the deflectable diaphragm 118 extending across the dual chamber balloon 102 from the circumferential edge 120. The lift gas chamber 124 is formed by the upper pliable balloon panel 114 and the deflectable diaphragm 118 and the air ballast chamber 126 is conversely formed by the lower balloon panel 116 and the deflectable diaphragm 118. Optionally, the deflectable diaphragm 118 extends around the dual chamber balloon, for instance the diaphragm 118 is coupled along an inner surface of one of the upper or lower balloon panels 114, 116.

In one example coupling of the upper pliable balloon panel 114 with the lower pliable balloon panel 116 along with coupling the deflectable diaphragm 118 to each of the upper and lower pliable balloon panels occurs at substantially the same time. For instance, as shown in Figure 7 each of the upper and lower pliable balloon panels 114, 116 are provided in a stacked configuration with the deflectable diaphragm 118 interposed therebetween. Where each of the panels is constructed with a substantially identical size the circumferential edge 120 for instance a seam or edge seal is formed at the outer perimeters of each of the panels 114, 116, 118 to accordingly form the dual chamber balloon 102 and the separate lift gas chamber 124 and air ballast chamber 126 therein. As discussed above, the deflectable diaphragm 118 has a smaller perimeter and is accordingly coupled with one of the panels 114, 116 (e.g., closer to one of th respective upper or lower apexes 110, 112).

Several options for the method 800 follow. In one example, the method 800 further includes selecting a first material for the upper pliable balloon panel 114 such as a heat reflective material (e.g., having a greater heat reflectivity than the lower pliable balloon panel 116). Additionally, the method 800 further includes in selecting a second material for the lower pliable balloon panel that is different from the first material of the upper pliable balloon panel 114. For instance, the second material for the lower pliable balloon panel 116 is selected for heat absorbency and accordingly has a higher heat absorbency relative to the upper balloon panel 114.

In another example, the method 800 further includes forming one or more laminated or coextruded films for each of the upper and lower balloon panels 114, 116. Optionally forming of the laminates or coextrusions of the upper and lower balloon panels 114, 116 includes coextruding one or more of the upper or lower pliable balloon panels 114, 116 with a layer of ethyl vinyl alcohol (EVOH). In one example, EVOH along with polyethylene forms a three layer film for use in the upper and lower balloon panels 114, 116. That is to say, in one example two layers of polyethylene are provided with an interposing layer of EVOH positioned therebetween. In other examples, the upper and lower balloon panels 114, 116 are formed with one or more other materials or combinations of materials to accordingly provide different material properties and balloon performance characteristics (in either or both of the upper and lower pliable balloon panels 114, 116) to the high altitude balloon system 100.

In another example coupling the deflectable diaphragm 118 to the upper and lower pliable balloon panels 114, 116 at the circumferential edge 120 includes forming a lift gas chamber having a first lift gas chamber volume and forming the ballast chamber with a second ballast chamber volume. Each of the lift gas chamber volume and the ballast chamber volume form a component of the dual chamber balloon volume of the dual chamber balloon 102.

Accordingly, with selective inflation and deflation, for instance of the ballast chamber 126 as shown in Figures 1 and 2, the volume of the lift gas chamber 124 is accordingly inversely changed. For instance, where descent of the high altitude balloon system 100 is desired the air ballast chamber 126 is inflated with the air ballast blower 202 shown in Figure 2 to accordingly increase the ballast chamber volume and accordingly decrease the lift gas chamber volume.

Accordingly, the dual chamber balloon 102 becomes less buoyant and the high altitude balloon system 100 descends.

Conversely, where ascent of the dual chamber balloon 102 is desired the air ballast chamber volume is decreased and the decrease in the volume correspondingly allows the lift gas chamber volume to increase. As the lift gas chamber 124 enlarges the dual chamber balloon 102 accordingly becomes more buoyant and the high altitude balloon system 100 correspondingly ascends to a higher altitude. In each of these scenarios the dual chamber balloon volume 102 remains substantially the same volume while the component volumes provided by the lift gas chamber 124 and the air ballast chamber 126 change to accordingly alter the buoyancy of the dual chamber balloon 102.

In another example, the method 800 includes coupling a plurality of tendons 122 (lines, filaments, taper or the like) over the balloon outer surface 121 of the dual chamber balloon 102. As previously described and shown for instance in Figures 1 and 4 each of the plurality of tendons 122 optionally extend from near the upper apex 110 to near the lower apex 112 and cross the circumferential edge 120. In another example, coupling the plurality of tendons 122 further includes retaining one or more of the plurality of tendons 122 along the circumferential edge 120. For instance referring to Figure 4 the plurality of tendons 122 are retained for instance within retaining orifices 402 formed in a circumferential retaining feature 400 (e.g., a flange of material) of the circumferential edge 120. Accordingly the plurality of tendons 122 are maintained in a distributed arrangement around the dual chamber balloon 102 according to the retention optionally provided at the circumferential edge 120.

In another example, the method 800 includes coupling a deflation port such as the deflation port 208 shown in Figure 2 with the dual chamber balloon 102 adjacent to the lift gas chamber 124. One example of the deflation port 208 is shown in Figure 5. In this example the deflation port 208 includes a valve flapper 502 rotatably coupled with a valve ring 500. As further shown a biasing element, such as a flapper biasing element 504, is configured to bias the valve flapper toward an open position to accordingly facilitate deflation of the lift gas chamber 124 and provide rapid descent of the dual chamber balloon 102 for instance at the end of the operational lifetime of the high altitude balloon system 100. As further shown in Figure 5 a retaining feature 506 is applied across the valve flapper 502 to accordingly hold the valve flapper 502 in a closed position. Disengagement of the retaining feature allows the biasing mechanism 504 to move the valve flapper 502 to the open position. In one example, the retaining feature 506 includes a feature such as a destructible link 508 configured to remotely sever the retaining feature 506 and free the flapper biasing element 504 to open the valve flapper 502.

In still another example, the method 800 further includes coupling a propulsion system, such as the propulsion system 106 with the dual chamber balloon 102. As shown for instance in Figure 1, the dual chamber balloon 102 has a gondola 107 including the propulsion system 106 thereon suspended from the dual chamber balloon by way of suspension lines 108. The propulsion system 106 is configured to provide directional control of the dual chamber balloon 102 for instance by way of rotation (the application of torque to the dual chamber balloon) and propulsion through the cooperative application of thrust through one or more propulsion elements to the dual chamber balloon 102. As described herein, in one example, the propulsion system includes a power source 604 or weight movably positioned along the central beam 606 of the gondola 108. Optionally, the method 800 includes translating the power source 604 or weight along the central beam to corresponding change the center of mass of the high altitude balloon system 100 and accordingly adjust pitch (e.g., during the application of thrust from the propulsion system 106).

In still another example the method 800 further includes installing the dual chamber balloon 102 within a remote launch system prior to inflation. In one example the remote launch system (described in more detail herein) includes a launch chamber configured to hold the dual chamber balloon therein during at least a portion of inflation of the balloon. An optional anti-static charge system is configured to minimize static electricity buildup along the dual chamber balloon especially during inflation. Optionally installing the dual chamber balloon within the remote launch system includes coupling an inert gas source (e.g., a reservoir of inert gas, anti-static media, humidified gas or the like) and a gas distribution mechanism with the launch chamber. The inert gas source and the gas distribution mechanism provide an environment within the launch chamber configured to substantially suppress or eliminate static electricity along the dual chamber balloon 102. Accordingly where the dual chamber balloon is inflated with a lighter- than- air gas such as hydrogen the anti-static system (and an optional ground) in combination with the gas distribution mechanism correspondingly minimizes the buildup of electrostatic charge and minimizes the combustible environment around the dual chamber balloon to minimize the chance of combustion of the dual chamber balloon 102 and the hydrogen therein.

In another example, and as shown in Figure 9, the high altitude balloon system 100 described herein further includes a remote launch system 900 that inflates at least the lift gas chamber 124 of the dual chamber balloon 102. The remote launch system 900 allows for inflation of the dual chamber balloon 102 in a safe and remote manner. The dual chamber balloon 102 is shown in a deflated and stored configuration within a launch chamber 910 of the system 900.

The remote launch system 900 includes a controller 902 in

communication with a reservoir of lighter than air gas 904 (e.g., a lift gas such as helium, hydrogen or the like). Optionally, the controller 902 is itself remote from the remainder of the remote launch system 900 and accordingly controls one or more of the features described herein from wired or wireless

communication. The controller 900 initiates and controls inflation of the dual chamber balloon 102 (e.g., at least the lift gas chamber 124) through gas tubing 908 connected between the reservoir of lighter than air gas 904 and an optional remote disconnect coupling 906 at the dual chamber balloon 102. As shown in Figure 9, the gas tubing 908 extends through the launch chamber 910 housing the stored dual chamber balloon 102 therein. Optionally, the controller 902 communicates with a blower or pump associated with the reservoir of lighter than air gas 904 to initiate and control inflation of the dual chamber balloon 102.

In one example, the launch chamber 910 includes a sealed environment surrounding the dual chamber balloon 102 during at least a portion of its inflation. Optionally, the launch chamber 910 includes one or more mechanisms configured to minimize static charge or decrease the likelihood of combustion in the environment within the chamber including the dual chamber balloon 102. For instance, the launch chamber 910 (and optionally the balloon 102) is grounded at 912 as shown. In another example, the remote launch system 900 includes a reservoir of inert gas 914 and a distribution mechanism 918, such as a blower, for distributing the inert gas into the launch chamber 910 through an inert gas inlet 916. The inert gas reservoir 914 includes, but is not limited to, one or more inert or noble gases (for decreased likelihood of combustion), a humidified gas, an aerosol with anti-static properties and the like.

During inflation, one or more of the ground 912 and the inert gas reservoir 914 (or other anti-static medium) and the distribution mechanism 918 cooperate to minimize any static charge build up on the dual chamber balloon 102. Immediately after or at some point during inflation the dual chamber balloon 102 is released from the launch chamber 910. The application of one or more of inert gas an anti- static medium or the like and grounding ensure that the dual chamber balloon 102, upon being exposed to ambient atmosphere, does not have sufficient static charge to trigger an electrical arc that could cause combustion of the lift gas (e.g., hydrogen) or the balloon 102. Optionally, the use of an inert gas minimizes the risk of combustion within the launch chamber 910 and around the balloon 102 immediately after deployment from the chamber 910. In still another example, the remote launch system 900 includes a hydrogen gas detection monitor configured to measure and optionally provide an alert if a hydrogen leak is present in either of the launch chamber 910 or the dual chamber balloon 102.

Referring now to Figure 10, one example of a remote disconnect coupling 210 is provided. As shown, the remote disconnect coupling 210 includes a nozzle receptacle 1000 sized and shaped to receive a port nozzle 1002 of an inflation port 1001 coupled with the dual chamber balloon 102 (e.g., the lift gas chamber 124). Additionally, the remote disconnect coupling 210 includes in the example shown a disconnect collar 1004 movably coupled around the nozzle receptacle 1000. The disconnect collar 1004 is sized and shaped to engage with the portion of the port nozzle 1002 at the inflation port 1001 to allow for remote disconnecting of gas tubing 908 (see Figure 9) extending from the lift gas reservoir 904, for instance by movement of the disconnect collar 1004 relative to the nozzle receptacle 1000.

As further shown in Figure 10, an actuator housing 1006 is coupled with the disconnect collar 1004. For instance, the actuator housing 1006 includes one or more actuators 1008 sized and shaped to move the disconnect collar 1004 relative to the nozzle receptacle 1000. In one example, the actuators 1008 includes a plurality of pistons and cylinders (e.g., air or hydraulic) that receive air under pressure or hydraulic fluid. In one example, the actuators 1008 include but are not limited to air cylinders having pistons disposed therein. The actuator pistons are shown coupled between the actuator housing 1006 and the disconnect collar 1004.

In operation, as the dual chamber balloon 102 is inflated to the configuration shown in Figure 1 a controller opens a valve allowing for the delivery of air (or cessation of delivery of air) to the actuator housing 1006 of the remote disconnect coupling 210, for instance the actuators 1008. In one example, the dual chamber balloon 102 is inflated within the launch chamber 910 of the remote launch system 900, and the controller includes the controller 902 shown in Figure 9. With an actuation instruction from the controller 902 the actuators 1008 correspondingly move the disconnect collar 1004. In one example, movement of the actuators 1008 causes contraction of pistons relative to the actuator housing 1006 and correspondingly moves the disconnect collar 1004 toward the actuator housing 1006 and away from the port nozzle 1002. This relative movement of the disconnect collar 1004 correspondingly disconnects the remote disconnect coupling 210 from the port nozzle 1002 of the inflation port 1001. For example, the disconnect collar 1004 includes a detent therein and movement of the disconnect collar 1004 forces a spring biased ball out of engagement with the detent. Because the dual chamber balloon 102 is in the fully inflated position shown in Figure 1 the weight of the remote disconnect coupling in combination with the operation of the disconnect collar allows the port nozzle to detach from the remote disconnect coupling and the coupling falls away from the atmospheric balloon system according to gravity.

In one example, the remote disconnect coupling 210 is able to act and thereby disconnect itself from the high altitude balloon system 100, for instance, at the inflation port 1001 without operation by an operator. Stated another way, an operator is not needed to climb to the inflation port 1001 and disconnect the gas tube 908 from the dual chamber balloon 102. Instead, the operator actuates the remote disconnect coupling 210, for instance from the controller 902.

Optionally, the controller 902 operates the remote disconnect coupling automatically upon determining (e.g., through pressure measurements provided through pressure tubing) that inflation of the dual chamber balloon is complete. Optionally, the remote disconnect coupling is used for one or both of the lift gas chamber 124 and for filling of the air ballast chamber 126. Figure 11 shows one example of a method 1100 for using a high altitude balloon system such as the system 100 shown in Figures 1 and 2. In describing the method 1100 reference is made to one or more components, features, functions, steps and the like described herein. Where convenient, reference is made to the components, features, steps, functions and the like with reference numerals. Reference numerals provided are exemplary and are not exclusive. For instance the features, components, functions, steps and the like described in the method 1100 include but are not limited to the corresponding numbered elements, other corresponding features described herein (both numbered and unnumbered) as well as their equivalents.

At 1102, the method 1100 includes inflating a dual chamber balloon 102 to a dual chamber balloon volume. The dual chamber balloon 102 includes a deflectable diaphragm 118 coupled along a circumferential edge 120 of the dual chamber balloon 102, as shown for instance in Figure 1. In Figure 2, the deflectable diaphragm 118 is coupled between the upper and lower apexes 110, 112 of the dual chamber balloon for instance along a circumferential edge 120 or another portion of one of the panels 114, 116, as described herein.

Inflating of the dual chamber balloon 102 includes, in at least one example at 1104, filling the lift gas chamber 124 of the dual chamber balloon 102 with a lighter than air gas (e.g., a lift gas). At 1106, the ballast chamber 126 of the balloon 102 is filled with a heavier gas (e.g., a ballast gas). For instance, for earth atmospheric purposes, in one example the lift gas chamber is filled with a lighter-than-air gas such as hydrogen, helium or the like. Conversely the ballast chamber 126 of the dual chamber balloon 102 is filled with a heavier gas, such as air. As shown for instance in Figure 2, in one example a controller 204 provided with the payload 104 of the high altitude balloon system 100 controls a source of lighter-than-air gas 200, for instance one or more tanks of lighter-than- air gas and accordingly supplies the lift gas chamber 124 with the lighter-than- air gas as needed (e.g., for supplementing if the gas gradually permeates the upper balloon panel 114). In a similar manner, the air ballast chamber 126 is supplied with air by way of an air ballast blower 202 also provided with the payload 104.

At 1108, the method 1100 further includes changing a lift gas chamber volume by changing a ballast chamber volume. As stated herein, the dual chamber balloon volume is maintained substantially constant throughout the operation of the high altitude balloon system 100 (for instance after the initial inflation). With changing of the volume of the air ballast chamber 126, for instance by way of operation of the air ballast blower 202, the volume of the air ballast chamber 126 is accordingly changed. That is to say, the deflectable diaphragm 118 is deflected upwardly or downwardly corresponding to increases or decreases of volume within the air ballast chamber 126. As the relative proportion of the air ballast chamber volume increases relative to the overall dual chamber balloon volume buoyancy of the dual chamber balloon 102 accordingly decreases. Conversely, as the air ballast chamber volume decreases the lift gas chamber volume correspondingly increases thereby increasing the buoyancy of the dual chamber balloon 102. In this way the dual chamber balloon 102 is able to selectively descend and ascend as desired by changing of the volume of the air ballast chamber 126 along with corresponding changes in the volume of the lift gas chamber 124 according to deflection of the diaphragm 118.

Several options for the method 1100 follow. In one example, inflating the dual chamber balloon 102 includes inflating the balloon within a launch chamber 910 of a remote launch system, such as the system 900 shown in Figure 9. In another example, the launch chamber 910 includes an anti-static charge (and combustion minimizing) system, for instance a reservoir of inert gas or an anti-static medium 914 coupled with a distribution mechanism such as a fan 918. The anti- static medium or inert gas is delivered through an inert gas inlet 916 (e.g., a fan, blower, atomizer or the like) into the launch chamber 910 to accordingly reduce one or more of static electricity and the likelihood of combustion within the launch chamber and along the dual chamber balloon 102 as it is inflating within the launch chamber 910.

In another example, inflating of the dual chamber balloon 102 further includes retaining a plurality of tendons 122 in a distributed arrangement around the dual chamber balloon 102. Referring again to Figure 1 the plurality of tendons 122 are shown in a distributed fashion for instance retained along the circumferential edge 120. That is to say, the circumferential edge 120 in one example includes a circumferential retaining feature 400 including a plurality of retaining orifices 402 therein sized and shaped to receive one or more of the tendons 122. The circumferential edge 120 accordingly retains the plurality of tendons 122 in a distributed fashion around the dual balloon chamber 102.

In another example the method 1100 further includes controlling a heading of the dual chamber balloon 102 (e.g., the high altitude balloon system 100) with a propulsion system 106 coupled with the dual chamber balloon 102. As shown in Figure 1 and further shown in Figure 6 the dual chamber balloon 106 in one example includes two or more propellers 600 provided in a spaced apart fashion (e.g., by one or more propeller arms 608). In one example, the propellers 600 cooperate to provide a torque to the dual chamber balloon 102 to accordingly rotate the high altitude balloon system 100 for instance where the propellers 600 are rotated at varying speeds relative to one another or where one of the propellers is reversed with regard to its rotation relative to the other of the propellers. As the high altitude balloon system 100 is turned onto a desired heading the propellers 600 are in one example operated in concert to accordingly propel the high altitude balloon system 100 along the desired direction. As further described herein, in another example, the method 1100 adjusts a center of gravity of the high altitude balloon system 100 to accordingly control the pitch of the system 100 as thrust is applied. Optionally, the center of gravity is controlled with the power source 604 or a weight translated along a central beam 606 of the gondola 107.

In another example, changing the lift gas chamber volume of the lift gas chamber 124 includes in one example inflating the ballast chamber 126 and increasing the ballast chamber volume to accordingly decrease the lift gas chamber volume. Deflating the air ballast chamber accordingly decreases the ballast chamber volume to increase the lift gas chamber volume of the lift gas chamber 124. With the increase of the ballast chamber volume the dual chamber balloon 102 as described herein becomes less buoyant and accordingly descends. Conversely, with decreasing of the ballast chamber volume and corresponding increase of the lift gas chamber volume the dual chamber balloon 102 becomes more buoyant and accordingly ascends. In still another example, inflation and deflation of the ballast chamber 126 are used to maintain the dual chamber balloon 102 at a static elevation for instance in response to pressure changes within the atmosphere. In still another example, inflating or deflating the ballast chamber 126 includes maintaining the dual chamber balloon volume constant while the lift gas chamber volume and the ballast chamber volume inversely change within the dual chamber balloon. The lift gas chamber volume and the ballast chamber volume together substantially equal the dual chamber balloon volume as previously described herein. That is to say, the dual chamber balloon volume is maintained at a substantially constant level after inflation of the dual chamber balloon 102 and it is through deflection of the deflectable diaphragm 118 with corresponding increasing and decreasing of the ballast chamber 126 that the buoyancy of the dual chamber balloon 102 is respectively decreased and increased (e.g., with corresponding changes to the volume of the lift gas chamber 124).

Optionally, inflating the ballast chamber and increasing the ballast chamber volume to decrease the lift gas chamber volume includes descent of the high altitude balloon system 100 to a first altitude wherein at the first altitude a first wind vector is found. The dual chamber balloon 102 for instance the high altitude balloon system 100 follows the first wind vector. In another example, deflating the ballast chamber and decreasing the ballast chamber volume to accordingly increase the lift gas chamber volume includes ascent of the high altitude balloon system 100 to a second altitude where the second altitude includes a second wind vector different from the first wind vector. The high altitude balloon system 100 follows the second wind vector at that higher altitude. Accordingly, in another example the method 1100 further includes directing and controlling movement of the high altitude balloon system through selective inflation and deflation of the ballast chamber 126 and corresponding changes in the lift gas chamber volume. By ascending or descending to various altitudes the high altitude balloon system 100 may accordingly be moved in one or more directions according to the wind vectors at each of those altitudes.

In still another example, changing the lift gas chamber volume by changing the ballast chamber volume includes deflecting the deflectable diaphragm 118 toward one of the upper apex 110 or the lower apex 112 (see Figure 1) while a deflectable diaphragm perimeter is coupled along the circumferential edge. That is to say, as previously described herein the deflectable diaphragm is a panel of material in one example extending across the dual chamber balloon 102 for instance along the circumferential edge 120. Accordingly, the deflectable diaphragm 118 is configured to deflect upwardly and downwardly in contrast to an inner or nested balloon that inflates while inside a larger balloon.

In still another example, the method 1100 includes opening a pressure control valve 206 shown in Figure 2 coupled with one or more of the lift gas chamber 124 or the ballast chamber 126. In one example, opening the pressure control valve 206 includes passively opening the pressure control valve automatically when the pressure in one of the lift gas chamber 124 or the ballast chamber 126 approaches or is above a threshold pressure (e.g., a pressure corresponding to a threshold skin stress of the balloon 102). That is to say, the pressure control valve 206 operates to decrease the pressure within the dual chamber balloon 102 to accordingly decrease skin stress for instance along the dual chamber balloon 102 (e.g., along the balloon outer surface 121). In another example opening the pressure control valve 206 includes remotely opening the pressure control valve, for instance by way of the controller 204 shown in Figure 2. The pressure control valve 206 is in one example operated to accordingly adjust a pressure within the balloon by way of the controller 204 as opposed to an automatic mechanism such as a sensor directly coupled with the pressure control valve 206. Various Notes & Examples

Example 1 can include a high altitude balloon system comprising: a dual chamber balloon, the dual chamber balloon extending from an upper apex to a lower apex with a circumferential edge between the upper and lower apexes; and a deflectable diaphragm within the dual chamber balloon and coupled along the circumferential edge, the deflectable membrane divides the dual chamber balloon into: a lift gas chamber formed by an interior surface of the dual chamber balloon and the deflectable diaphragm, and a ballast chamber formed by the interior surface of the dual chamber balloon and the deflectable diaphragm, the ballast chamber configured to change the buoyancy of the dual chamber balloon.

Example 2 can include, or can optionally be combined with the subject matter of Example 1, to optionally include wherein the dual chamber balloon includes: an upper pliable balloon panel having the upper apex, a lower pliable balloon panel having the lower apex, and the deflectable diaphragm is interposed between upper and lower pliable balloon panels, and wherein the upper and lower pliable balloon panels and the deflectable diaphragm are coupled along the circumferential edge to form the dual chamber balloon.

Example 3 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1 or 2 to optionally an edge seal extending along the circumferential edge, and the edge seal seals each of the lift gas chamber and the ballast chamber.

Example 4 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1 through 3 to optionally include wherein the deflectable diaphragm is a pliable diaphragm panel coupled between the upper and lower pliable balloon panels at the circumferential edge.

Example 5 can include, or can optionally be combined with the subject matter of one or any combination of Examples 1-4 to optionally include wherein the pliable diaphragm panel is the same size as the upper and lower pliable balloon panels.

Example 6 can include, or can optionally be combined with the subject matter of Examples 1-5 to optionally include wherein at least two or more of the upper and lower pliable balloon panels and the pliable diaphragm panel are constructed with different materials.

Example 7 can include, or can optionally be combined with the subject matter of Examples 1-6 to optionally include wherein the upper pliable balloon panel is configured as a space facing side of the dual chamber balloon and includes a heat reflective material, and the lower pliable balloon panel is configured as an earth facing side of the dual chamber balloon and includes a heat absorbent material, a heat reflectivity of the upper pliable balloon panel is greater than a heat reflectivity of the lower pliable balloon panel, and a heat absorbency of the lower pliable balloon panel is greater than a heat absorbency of the upper pliable balloon panel.

Example 8 can include, or can optionally be combined with the subject matter of Examples 1-7 to optionally include wherein a dual chamber balloon volume is constant, and a lift gas chamber volume and a ballast chamber volume are variable components of the dual chamber balloon volume.

Example 9 can include, or can optionally be combined with the subject matter of Examples 1-8 to optionally include wherein the ballast chamber volume is adjustable between 0 and 100 percent and the lift gas chamber volume is conversely adjustable between 0 and 100 percent of the dual chamber volume.

Example 10 can include, or can optionally be combined with the subject matter of Examples 1-9 to optionally include wherein the dual chamber balloon includes a balloon outer surface, and a plurality of tendons extend over the balloon outer surface from the upper apex to the lower apex.

Example 11 can include, or can optionally be combined with the subject matter of Examples 1-10 to optionally include wherein each of the plurality of tendons are coupled with a circumferential anchor at the circumferential edge, and the circumferential anchor retains the plurality of tendons in a distributed arrangement around the dual chamber balloon.

Example 12 can include, or can optionally be combined with the subject matter of Examples 1-11 to optionally include wherein the dual chamber balloon includes a laminated or coextruded film, the laminated or coextruded film including: at least one polyethylene layer, and an eythyl vinyl alcohol layer.

Example 13 can include, or can optionally be combined with the subject matter of Examples 1-12 to optionally include a source of lighter than air gas coupled with the lift gas chamber; and a controller with ascending, descending and static modes: in the static mode the controller coordinates a lift gas chamber volume and a ballast chamber volume to hold the high altitude balloon system at a static altitude, in the descending mode the controller increases the ballast chamber volume to decrease the lift gas chamber volume to lower the high altitude balloon system from the static altitude, and in the ascending mode the controller decreases the ballast chamber volume to increase the lift gas chamber volume to elevate the high altitude balloon system from the static altitude.

Example 14 can include, or can optionally be combined with the subject matter of Examples 1-13 to optionally include a deflation port in communication with the lift gas chamber, the deflation port including: a valve flapper rotatably coupled with a valve ring, a biasing mechanism configured to bias the valve flapper toward an open position, and a retaining feature configured to hold the valve flapper in a closed position, disengagement of the retaining feature allowing the biasing mechanism to move the valve flapper to the open position.

Example 15 can include, or can optionally be combined with the subject matter of Examples 1-14 to optionally include wherein the retaining feature includes a destructible link, a heating element, and a receiver configured to initiate destructible of the destructible link with the heating element upon reception of a deflation signal.

Example 16 can include, or can optionally be combined with the subject matter of Examples 1-15 to optionally include a propulsion system coupled with the dual chamber balloon, the propulsion system providing directional control of the dual chamber balloon.

Example 17 can include, or can optionally be combined with the subject matter of Examples 1-16 to optionally include wherein the propulsion system includes: a gondola coupled with the dual chamber balloon, and at least one propulsion unit coupled with the gondola and configured to control a heading of the balloon.

Example 18 can include, or can optionally be combined with the subject matter of Examples 1-17 to optionally include a remote launch system including: a launch chamber configured to hold the dual chamber balloon therein during at least a portion of inflation, and an anti- static charge system configured to minimize static electricity build up along the dual chamber balloon.

Example 19 can include, or can optionally be combined with the subject matter of Examples 1-18 to optionally include wherein the anti-static charge system includes an inert gas source and a gas distribution mechanism coupled with the launch chamber. Example 20 can include, or can optionally be combined with the subject matter of Examples 1-19 to optionally include a method of making a high altitude balloon system comprising: interposing a deflectable diaphragm between an upper pliable balloon panel and a lower pliable balloon panel, the upper pliable balloon panel including an upper apex of a dual chamber balloon, and the lower pliable balloon including a lower apex of the dual chamber balloon; and forming the dual chamber balloon including: coupling the upper pliable balloon panel with the lower pliable balloon panel at a circumferential edge to form a balloon outer surface of the dual chamber balloon, coupling the diaphragm to the upper and lower pliable balloon panels at the circumferential edge to form a lift gas chamber and a ballast chamber, the ballast chamber separated from the lift gas chamber by the diaphragm, and wherein the lift gas chamber is formed by the upper pliable balloon panel and the diaphragm, and the ballast chamber is formed by the lower pliable balloon panel and the diaphragm.

Example 21 can include, or can optionally be combined with the subject matter of Examples 1-20 to optionally include wherein coupling the upper pliable balloon panel with the lower pliable balloon panel and coupling the diaphragm to the upper and lower pliable balloon panels occurs at the same time.

Example 22 can include, or can optionally be combined with the subject matter of Examples 1-21 to optionally include selecting a first material for the upper pliable balloon panel, and selecting a second material for the lower pliable balloon panel, the first material different from the second material.

Example 23 can include, or can optionally be combined with the subject matter of Examples 1-22 to optionally include wherein selecting the first material includes selecting a heat reflective material, a heat reflectivity of the first material greater than a heat reflectivity of the second material, and selecting the second material includes selecting a heat absorbent material, a heat absorbency of the second material greater than a heat reflectivity of the first material.

Example 24 can include, or can optionally be combined with the subject matter of Examples 1-23 to optionally include coextruding one or more of the upper or lower pliable balloon panels with a layer of ethyl vinyl alcohol. Example 25 can include, or can optionally be combined with the subject matter of Examples 1-24 to optionally include wherein one or more of coupling the upper and lower pliable balloon panels at the circumferential edge and coupling the diaphragm to the upper and lower pliable balloon panels includes forming an edge seal along the circumferential edge, the edge seal seals each of the lift gas chamber and the ballast chamber.

Example 26 can include, or can optionally be combined with the subject matter of Examples 1-25 to optionally include coupling a plurality of tendons over a balloon outer surface of the dual chamber balloon, each of the plurality of tendons extending from near the upper apex to near the lower apex and crossing the circumferential edge.

Example 27 can include, or can optionally be combined with the subject matter of Examples 1-26 to optionally include wherein coupling the plurality of tendons includes retaining one or more of the plurality of tendons along the circumferential edge, and retaining maintains the plurality of tendons in a distributed arrangement around the dual chamber balloon.

Example 28 can include, or can optionally be combined with the subject matter of Examples 1-27 to optionally include wherein coupling the diaphragm to the upper and lower pliable balloon panels at the circumferential edge includes: forming the lift gas chamber having a lift gas chamber volume, forming the ballast chamber having a ballast chamber volume, and each of the lift gas chamber volume and the ballast chamber volume variably fill a dual balloon chamber volume of the dual chamber balloon.

Example 29 can include, or can optionally be combined with the subject matter of Examples 1-28 to optionally include coupling a deflation port with the dual chamber balloon adjacent to the lift gas chamber, the deflation portion including: a valve flapper rotatably coupled with a valve ring, a biasing mechanism configured to bias the valve flapper toward an open position, and a retaining feature configured to hold the valve flapper in a closed position, disengagement of the retaining feature allowing the biasing mechanism to move the valve flapper to the open position. Example 30 can include, or can optionally be combined with the subject matter of Examples 1-29 to optionally include coupling a propulsion system with the dual chamber balloon, the propulsion system providing directional control of the dual chamber balloon.

Example 31 can include, or can optionally be combined with the subject matter of Examples 1-30 to optionally include wherein coupling the propulsion system includes coupling a gondola with the dual chamber balloon, and the gondola includes at least one propulsion unit configured to control a heading of the balloon.

Example 32 can include, or can optionally be combined with the subject matter of Examples 1-31 to optionally include installing the dual chamber balloon within a remote launch system, the remote launch system including: a launch chamber configured to hold the dual chamber balloon therein during at least a portion of inflation, and an anti- static charge system configured to minimize static electricity build up along the dual chamber balloon.

Example 33 can include, or can optionally be combined with the subject matter of Examples 1-32 to optionally include wherein installing the dual chamber balloon within the remote launch system includes coupling an inert gas source and a gas distribution mechanism with the launch chamber.

Example 34 can include, or can optionally be combined with the subject matter of Examples 1-33 to optionally include a method of using a high altitude balloon comprising: inflating a dual chamber balloon to a dual chamber balloon volume, the dual chamber balloon including a deflectable diaphragm coupled along a circumferential edge of the dual chamber balloon and between upper and lower apexes of the dual chamber balloon, inflating including: filling a lift gas chamber of the dual chamber balloon with a lighter gas, and filling a ballast chamber of the balloon with a heavier gas; and changing a lift gas chamber volume by changing a ballast chamber volume.

Example 35 can include, or can optionally be combined with the subject matter of Examples 1-34 to optionally include wherein inflating the dual chamber balloon includes inflating the dual chamber balloon within a launch chamber having an anti- static charge system. Example 36 can include, or can optionally be combined with the subject matter of Examples 1-35 to optionally include wherein inflating the dual chamber balloon includes inflating the dual chamber balloon with hydrogen.

Example 37 can include, or can optionally be combined with the subject matter of Examples 1-36 to optionally include wherein inflating the dual chamber balloon includes filling the launch chamber with an inert gas.

Example 38 can include, or can optionally be combined with the subject matter of Examples 1-37 to optionally include wherein inflating the dual chamber balloon includes retaining a plurality of tendons in a distributed arrangement around the dual chamber balloon.

Example 39 can include, or can optionally be combined with the subject matter of Examples 1-38 to optionally include wherein retaining the plurality of tendons in the distributed arrangement includes retaining the plurality of tendons at the circumferential edge.

Example 40 can include, or can optionally be combined with the subject matter of Examples 1-39 to optionally include controlling a heading of the dual chamber balloon with a propulsion system coupled with the dual chamber balloon.

Example 41 can include, or can optionally be combined with the subject matter of Examples 1-40 to optionally include wherein changing the lift gas chamber volume includes: inflating the ballast chamber and increasing the ballast chamber volume to decrease the lift gas chamber volume, and deflating the air ballast chamber and decreasing the ballast chamber volume to increase the lift gas chamber volume.

Example 42 can include, or can optionally be combined with the subject matter of Examples 1-41 to optionally include wherein inflating the ballast chamber and increasing the ballast chamber volume to decrease the lift gas chamber volume includes descending to a first altitude having a first wind vector, the dual chamber balloon following the first wind vector, and deflating the ballast chamber and decreasing the ballast chamber volume to increase the lift gas chamber volume includes ascending to a second altitude having a second wind vector different from the first wind vector, the dual chamber balloon following the second wind vector.

Example 43 can include, or can optionally be combined with the subject matter of Examples 1-42 to optionally include wherein changing the lift gas chamber volume includes deflecting the deflectable diaphragm toward one of the upper apex or the lower apex while a deflectable diaphragm perimeter is coupled along the circumferential edge.

Example 44 can include, or can optionally be combined with the subject matter of Examples 1-43 to optionally include opening a pressure control valve coupled with one or more of the lift gas chamber or the ballast chamber.

Example 45 can include, or can optionally be combined with the subject matter of Examples 1-44 to optionally include wherein opening the pressure control valve includes passively opening the pressure control valve when a pressure in one of the lift gas chamber or the ballast chamber is above a threshold pressure.

Example 46 can include, or can optionally be combined with the subject matter of Examples 1-45 to optionally include wherein opening the pressure control valve includes remotely opening the pressure control valve.

Example 47 can include, or can optionally be combined with the subject matter of Examples 1-46 to optionally include wherein inflating or deflating the ballast chamber includes maintaining the dual chamber balloon volume constant while the lift gas chamber volume and the air ballast chamber volume inversely change within the dual chamber balloon, and the lift gas chamber volume and the ballast chamber volume together substantially equal the dual chamber balloon volume.

Each of these non- limiting examples can stand on its own, or can be combined in any permutation or combination with any one or more of the other examples.

The above detailed description includes references to the accompanying drawings, which form a part of the detailed description. The drawings show, by way of illustration, specific embodiments in which the invention can be practiced. These embodiments are also referred to herein as "examples." Such examples can include elements in addition to those shown or described.

However, the present inventors also contemplate examples in which only those elements shown or described are provided. Moreover, the present inventors also contemplate examples using any combination or permutation of those elements shown or described (or one or more aspects thereof), either with respect to a particular example (or one or more aspects thereof), or with respect to other examples (or one or more aspects thereof) shown or described herein.

In the event of inconsistent usages between this document and any documents so incorporated by reference, the usage in this document controls.

In this document, the terms "a" or "an" are used, as is common in patent documents, to include one or more than one, independent of any other instances or usages of "at least one" or "one or more." In this document, the term "or" is used to refer to a nonexclusive or, such that "A or B" includes "A but not B," "B but not A," and "A and B," unless otherwise indicated. In this document, the terms "including" and "in which" are used as the plain-English equivalents of the respective terms "comprising" and "wherein." Also, in the following claims, the terms "including" and "comprising" are open-ended, that is, a system, device, article, composition, formulation, or process that includes elements in addition to those listed after such a term in a claim are still deemed to fall within the scope of that claim. Moreover, in the following claims, the terms "first," "second," and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

Method examples described herein can be machine or computer- implemented at least in part. Some examples can include a computer-readable medium or machine-readable medium encoded with instructions operable to configure an electronic device to perform methods as described in the above examples. An implementation of such methods can include code, such as microcode, assembly language code, a higher- level language code, or the like. Such code can include computer readable instructions for performing various methods. The code may form portions of computer program products. Further, in an example, the code can be tangibly stored on one or more volatile, non- transitory, or non- volatile tangible computer-readable media, such as during execution or at other times. Examples of these tangible computer-readable media can include, but are not limited to, hard disks, removable magnetic disks, removable optical disks (e.g., compact disks and digital video disks), magnetic cassettes, memory cards or sticks, random access memories (RAMs), read only memories (ROMs), and the like.

The above description is intended to be illustrative, and not restrictive. For example, the above-described examples (or one or more aspects thereof) may be used in combination with each other. Other embodiments can be used, such as by one of ordinary skill in the art upon reviewing the above description. The Abstract is provided to comply with 37 C.F.R. § 1.72(b), to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Also, in the above Detailed Description, various features may be grouped together to streamline the disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the Detailed Description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that such embodiments can be combined with each other in various

combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.