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Title:
METHOD AND SYSTEM FOR TOWING A FLYING OBJECT
Document Type and Number:
WIPO Patent Application WO/2013/156680
Kind Code:
A1
Abstract:
A system (100) for towing a flying object (101) comprises a supporting means (102) for supporting the flying object at the beginning of towing. The system has also a first supporting point (107) via which a cable (105) is introduced from a towing device (106) to the flying object, as well as a second supporting point (110), via which the cable (105) is introduced to the flying object (101) after towing or at least during landing. In addition the system comprises a transferring means (103) configured to move along a rail (104) and configured to transfer the cable (105) or at least a loop of the cable to pass the second supporting point (110) after towing.

Inventors:
SUOMINEN, Ilpo (Finninmäenkatu 4 E 45, Tampere, FI-33710, FI)
BERG, Tommi (Satamakatu 1 A 20, Tampere, FI-33200, FI)
Application Number:
FI2013/050420
Publication Date:
October 24, 2013
Filing Date:
April 17, 2013
Export Citation:
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Assignee:
ALULA ENERGY OY (Satamakatu 1 A 20, Tampere, FI-33200, FI)
International Classes:
B64C39/02; B64F1/08; F03D5/00
Foreign References:
US20100032948A1
US20070228738A1
US20100026007A1
US20100117371A1
Attorney, Agent or Firm:
BERGGREN OY AB (P.O. Box 16, Helsinki, FI-00101, FI)
Download PDF:
Claims:
Claims

1. A system (100, 300, 400, 700) for towing a flying object (101 ), such as a kite or device comprising a wing, wherein the system comprises:

- a supporting means (102, 500) for supporting said flying object at the beginning of towing,

- a first supporting point (107) via which a cable (105) is to be introduced from a towing device (106) to the flying object, where said first supporting point is provided in a distance (109) from said supporting means at least during the towing, and

- a second supporting point (1 10), via which said cable is to be introduced from the towing device to the flying object after towing or at least partially during landing, and

- a transferring means (103) configured to introduce said cable or at least a loop of said cable to pass said second supporting point after towing. 2. A system of claim 1 , wherein the transferring means (103) is configured to provide said cable or at least a loop of said cable to pass said first supporting point (107) at least before towing.

3. A system of any of previous claims, wherein the system comprises also said towing device (106), said towing device being configured to tow said flying object via said cable (105) by drawing said cable.

4. A system of any of previous claims, wherein said transferring means (103) comprises said first supporting point (107), and wherein the distance (109) of said first supporting point from the supporting means (102, 500) is configured to be adjustable with said transferring means. 5. A system of any of previous claims, wherein said second supporting point (1 10) is arranged in connection with said supporting means (102, 500).

6. A system of any of previous claims, wherein the transferring means (103) is configured to move from the first supporting point (107) to the second supporting point (1 10) after towing, but before landing, whereupon the first supporting point (107) is configured to be after moving of said transferring means said second supporting point (107, 1 10).

7. A system of any of previous claims, wherein the system comprises at least one elongated path (104), such as a rail, along which said transferring means is configured to move between the supporting means and the point at the distance (109) from said supporting means (102, 500).

8. A system of claim 7, wherein said elongated path (104) is hinged at a first point (702) and configured to be moved (701 ) in a circular manner (1 12a) in relation to said first point.

9. A system of any of previous claims, wherein the supporting means is an arm (102) hinged at its first end (102a), and whereupon said arm is preferably configured to bend (108) around the hinge before towing in the opposite direction of towing, and providing initial speed for said flying object at the beginning of towing by turning in the direction of towing.

10. A system of any of previous claims, wherein the supporting means is an arm (102) hinged at its first end (102a), and whereupon said arm is configured at first to bend and/or turn around (1 12) the hinge towards said flying object during the approach of said flying object for landing and docking with said arm, and at second to bend along with said flying object when said flying object is docking with said arm.

1 1. A system of any of previous claims 1 -7, wherein the supporting means is a slide (500), and whereupon said slide is preferably configured to move along a path (502) before towing in the opposite direction of towing, and providing initial speed for said flying object at the beginning of towing by moving along said path in the direction of towing.

12. A system of any of previous claims 1 -7 or 1 1 , wherein the supporting means is a slide (500), and whereupon said slide is configured at first to move along a path (502) towards said flying object during the approach of said flying object for landing and docking with said slide, and at second to move along the path and along with said flying object when said flying object is docking with said slide.

13. A system of claim 12, wherein said slide (500) or the path system (502) along which said slide is configured to move, is hinged around a vertical axel (503), and configured to turn around said vertical hinge essentially in parallel with the flying path of said landing flying object.

14. A system of claim 12, wherein said slide or the path system along which said slide is configured to move, is arranged to be turned via another, essentially circular path (504), such as a rail having a form of an arc or circle, so that said slide or the path system is essentially in parallel with the flying path of said landing flying object.

15. A system of any of previous claims, wherein the system comprises a power extractor (106), such as an electric generator, for extracting power during a traction phase of said flying object induced by the wind.

16. A system of any of previous claims, wherein said towing device (106) is also configured to recover said flying object (101 ) back via said cable (105) by drawing said cable. 17. A system of any of claims 13-16, wherein said power extractor is used as said towing device during towing.

18. A system of any of previous claims, wherein the second supporting point (1 10) is configured to release said cable (105) during approach of the flying object for example in the emergency or similar situation, and whereupon said towing device is configured to provide air speed greater than stalling speed for said flying object by towing it back to the air.

19. A system of any of previous claims, wherein the system comprises an actuating means (600), such as a fluidic muscle (603), said actuating means comprising at least one movable supporting point (601 ) via which said cable (105) is to be provided from the towing device to the flying object, wherein said at least one movable supporting point is configured to move essentially in the direction (602) of said cable and thereby to compensate possible variations in the tightness of said cable induced during operation.

20. A system of claim 19, wherein the system is configured to change the tension in the cable in different phases of the towing, flying and landing of the flying device, such as tightening the tension of the cable at the start of the towing, loosening during approach and again tightening during touchdown and/or docketing.

21. A system of any of previous claims, wherein said arrangement comprises plurality of said elongated paths (104), such as rails, along which said transferring means (103) is adapted to move and thereby provide said first supporting point (107) from the plurality of first supporting point candidates taking into account for example the direction of the wind.

22. A system of claim 21 , wherein the supporting means is hinged at its first end so that it can be turned around the hinge essentially in the direction of at least one elongated path, and/or wherein said system comprises also plurality of said supporting means. 23. A system of any of previous claims, wherein the system comprises means for positioning (401 ) said flying object, such as radio transmitters in connection with said system, such as at the first supporting points which the radio receiver at the flying device is configured to listen and thereby determining its position, and where said system is configured to control the fly of said flying object at least partially based on the position of said flying object.

24. A system of any of previous claims, wherein the flying object comprises a mass configured to be moved essentially in the longitudinal direction of said flying object, and which is configured to be move essentially backwards at least during the approach or landing.

25. A system of any of previous claims, wherein the angle of incidence of the wing of the flying object is configured to be change during operation, such as increasing during approaching or landing.

26. A power generation arrangement (300, 400, 700) for generating wind power by using at least one flying object (101 ), wherein said arrangement comprises at least one of the system of any of claims 1 -25 for towing said flying object.

27. A method for towing a flying object (101 ), such as a kite or device comprising a wing, wherein the method comprises:

- supporting said flying object at the beginning of towing by a supporting means (102),

- introducing a cable (105) via a first supporting point (107) from a towing device (106) to the flying object, where said first supporting point locates in a distance (109) from said supporting means at least during the towing, and

- introducing said cable or at least a loop of said cable to pass via a second supporting point (1 10) from the towing device to the flying object after towing or at least partially during landing.

Description:
METHOD AND SYSTEM FOR TOWING A FLYING OBJECT

TECHNICAL FIELD OF THE INVENTION

The invention relates to a method and system for towing a flying object, such as a kite or device comprising a wing. Especially the invention relates to towing a flying object of power generation arrangement, which is configured to generate wind power by using said flying object.

BACKGROUND OF THE INVENTION Different kinds of wind power generating systems are known from prior art, where power is generated from wind by using e.g. kites or wings to pull out a cable or line from a power extractor such as a generator. One problem relating to these kinds of systems is how to line up the flying object. According to one solution the flying object is provided with an engine or electric motor, which anyway has the problem of quite high mass, noise and complexity. In addition also flying objects without an engine is known, where the flying object is launched by a revolving arm. After gaining enough speed the flying object is released, following an upward spiral while the cable is released. However, the solution having the revolving arm has quite large- size moving and rotating structures, which make the system dangerous and structurally disadvantageous. In addition the flying object in the revolving arm system is long time at very low altitude during launching and landing, which additionally sets further requirement for the environment as well as increases the risk for crash. The flying object is very vulnerable at low altitude and along a circular path due to e.g. turbulence or wind shear, which might cause high variations to the air speed and thereby stalling.

SUMMARY OF THE INVENTION

An object of the invention is to alleviate and eliminate the problems relating to the known prior art. Especially the object of the invention is to provide a system for towing, such as launching or winching and thereby providing air speed for a flying object into an operating altitude, as well as drawing it back to the ground in easy, fast, reliable and safe manner.

The object of the invention can be achieved by the features of independent claims. The invention relates to a system for towing a flying object according to claim 1. In addition the invention relates to a power generation arrangement for generating wind power according to claim 26, and a method for towing the flying object according to claim 27.

According to an embodiment of the invention a system for towing a flying object, such as a kite or a device comprising a wing, comprises a supporting means for supporting the flying object at the beginning of towing. The flying object is advantageously attached to the supporting means in a releasable manner, such as using a locking member which can be opened at launching, an electric magnet or the like known from prior art. The supporting means may be an arm or a slide, for example.

In addition the system comprises a first supporting point via which a cable is introduced from a towing device to the flying object especially during the towing. The first supporting point is advantageously provided in a distance from said supporting means at least during the towing. The first supporting point may be fixed supporting point, or a mobile first supporting point, whereupon the distance of the first supporting point from the supporting means can be adjusted.

Furthermore, according to an embodiment, the system comprises also a second supporting point, via which said cable is introduced to the flying object after towing or at least partially during landing or approaching. According to an embodiment, the second supporting point is advantageously nearby or in connection with the supporting means so that the cable when drawn would guide the flying object towards said system or the supporting means. The towing device may be used, according to an embodiment, as a generator, which functions as a towing device during towing and a generator when generating electricity during the traction phase of the flying object. In addition the towing device may be used for recovering the flying object back to the ground via the cable by drawing the cable, such as e.g. winding the cable into a reel.

According to an embodiment the system also comprises a transferring means configured to introduce or transfer the cable or at least a loop of the cable to pass the first supporting point before or during the towing. In addition according to an embodiment the transferring means is configured to introduce or transfer the cable or at least a loop of the cable to pass the second supporting point after towing. According to an example, the transferring means is a transferring slide, which is configured to move along a rail from/to the supporting means.

The transferring means may, according to an embodiment, comprise said first supporting point, whereupon the first supporting point is moved along said transferring means. Thus, when the transferring means is moving back to the vicinity of the supporting means, also the first supporting point is moving along it, whereby the first supporting point (when locating near the supporting means) functions as said second supporting point during approaching or landing. However, according to another embodiment the second supporting point is provided in connection with said supporting means, and may be implemented e.g. by a hook with a possible pulley or the like via which said cable is free to be reeled. Advantageously said hook with a possible pulley or the like comprises releasable means for releasing said cable for example in an emergency situation whereupon the flying object can even be towed again up to the sky.

Still, according to an exemplary embodiment the system or group of the systems described here may be arranged to function as a power generation arrangement or as a wind park for generating wind power. According to an embodiment the wind park advantageously comprises plurality of paths, like rails, along which one or more transferring means can be moved and thereby establish plurality of the first supporting points for plurality of the flying object. Thereby the wind park according to the invention can utilize numbers of the flying object at the same time independently from each other. The system may advantageously comprise location means, such as radio transmitters, by which the location of each flying object can be determined and thereby controlling their flying circuit in order to prevent any crash. The invention offers remarkable advantages over the known prior art solution, such as possibility to interrupt the approaching or landing e.g. in an emergency situation. In addition the direction of launching can be chosen very freely selecting an appropriate path along which the first supporting point is to established and thereby taking into account e.g. wind conditions. The structure of the system is also very simple and there is no need for large or massive rotating members for launching the flying object. Furthermore the current and prior art systems using almost any flying objects can utilize the towing system of the invention for launching or towing their planes, kites, wings or other flying objects. The invention removes the need for any engines or motors to be used in connection with the flying object, whereupon environmental or ambient noise is reduced remarkably. The system, and especially the paths along which the transferring means is moving, can be raised above the ground surface (e.g. above pillars or other supports), whereupon also the area under the wind park can be used for any other purpose, such as farming or agriculture or even for storehouses or solar cells.

BRIEF DESCRIPTION OF THE DRAWINGS Next the invention will be described in greater detail with reference to exemplary embodiments in accordance with the accompanying drawings, in which:

Figures 1A-1 C illustrate a principle of an exemplary system and method for towing a flying object according to an advantageous embodiment of the invention,

Figures 2A-2C illustrate a principle of an exemplary system and method for guiding a flying object for approaching or landing according to an advantageous embodiment of the invention,

Figure 3 illustrates a principle of an exemplary fly control system and method according to an advantageous embodiment of the invention,

Figures 4A-4B illustrate an exemplary power generation arrangement or wind park comprising numbers of the systems according to an advantageous embodiment of the invention, Figure 5 illustrates an exemplary supporting means for supporting the flying object according to an advantageous embodiment of the invention,

Figure 6 illustrates an exemplary actuating means for compensate possible variations in the tightness of a towing cable according to an advantageous embodiment of the invention, and

Figure 7 illustrates an example of a movable elongated path of the system for towing a flying object according to an advantageous embodiment of the invention.

DETAILED DESCRIPTION

Figures 1A-1 C illustrate a principle of an exemplary system 100 for towing a flying object 101 according to an advantageous embodiment of the invention, where the system comprises a supporting means 102, such as an arm, for supporting the flying object 101 before the towing. The system also comprises a transferring means 103 and advantageously at least one path 104, such as a rail, along which the transferring means 103 can be moved. The flying object is towed by a cable 105, which is advantageously winched into a reel by a towing device 106 (details of the towing device are not shown). According to an exemplary embodiment the transferring means transfers the cable 105 or at least a loop of said cable to pass a first supporting point 107 before towing. The supporting means 102, such as the arm, may be hinged and bend 108 at its first end around the hinge 102a before towing in the opposite direction of towing, and providing initial speed for the flying object 101 at the beginning of towing by turning in the direction of towing.

The towing device 106 may locate for example nearby the supporting means, as is illustrated in Figures, but it should be noted that the towing device may also locate in another locations, such as for example nearby the first supporting point 107 (at the free end of the rail 104) or the like. The towing device may also be used as a generator, which functions as a towing device during towing and a generator when generating electricity during the traction phase of the flying object (see Fig. 3). In addition the towing device may be used for recovering the flying object back to the ground via the cable by drawing the cable, such as e.g. winding the cable into a reel, as is illustrated in connection with Figures 2A-2C.

It is to be noted that the transferring means 103 may comprise the first supporting point 107 (such as a hook or the like provided with connection with the sliding transferring means 103), whereupon the distance 109 of the first supporting point 107 from the supporting means 102 can be adjusted by moving the transferring means 103 along the rail 104. According to another embodiment the first supporting point 107 may be a fixed supporting point, when the transferring means 103 is configured to bring the cable or loop of the cable to pass via said supporting point.

Figures 2A-2C illustrate a principle of an exemplary system 100 for guiding the flying object 101 for approaching or landing according to an advantageous embodiment of the invention. According to an exemplary embodiment the cable 105 is introduced to the flying object 101 via a second supporting point 1 10 for approaching or landing. The second supporting point 1 10 locates advantageously nearby or in connection with the supporting means 102, towards which the flying object is guided for landing.

The cable 105 can be introduced to the second supporting point 1 10 in many ways. According to an example, the transferring means 103 may move back to the vicinity of the supporting means 102 after towing (or energy production phase), whereupon also the first supporting point 107 is moving along it (if it is fixed with the sliding or moving transferring means 103). Thus, the first supporting point 107 (when moved near the supporting means 102) may also function as the second supporting point 1 10 during approaching or landing of the flying object, as is illustrated in Figure 2A.

However, according to another embodiment the second supporting point 1 10 is provided in connection with said supporting means, and may be implemented e.g. by a hook with a possible pulley or the like via which the cable 105 is free to be reeled. The transferring means 103 may transfer the cable or loop of the cable in the vicinity of the supporting means 102, whereupon the supporting means, such as the arm, may pick it up into the second supporting point 1 10. The arm 102 may comprise e.g. a catching means, like a hook, to catch the cable. Advantageously the second supporting point 1 10 is located at the free end of the supporting arm 102. The second supporting point 1 10, such as the hook with a possible pulley or the like advantageously comprises releasable means 1 1 1 for releasing the cable for example in an emergency situation, whereupon the flying object 101 can even be towed again up to the sky, as is illustrated in Figure 2C. In this situation the first supporting point 107 is advantageously at the distance from the supporting means 102, whereupon the towing device 106 advantageously provides air speed greater than stalling speed for the flying object 101 by towing it back to the air via the cable 105 (e.g. by reeling the cable in to the reel). In addition the supporting means 102, such as the arm, is hinged at its first end 102a, whereupon the arm advantageously bends at first and/or turn 108 around the hinge (around a horizontal axis) towards the flying object 101 during the approach of the flying object 101 for landing and docking with the arm, and at second bends along with the flying object 101 when the flying object 101 is docking with the arm 102. Thus the supporting means 102 (arm) is advantageously an actively controlled arm.

The supporting means 102 may be hinged at its first end 102a both around a horizontal axis 108 and/or a vertical axis 1 12, whereupon it can be turned around the hinge essentially in the direction of a wind, or wherein the system 100, 300, 400 comprises plurality of the elongated paths or rails 104, the supporting means 102 may be turned essentially in the direction of one path or rail 104 (actively controlled supporting means 102). The landing and docking is much easier if the supporting means 102 is turned to an angle (e.g. 30°) towards to landing flying object, for example if the wind direction is changed.

According to an example the flying object 101 comprises a movable mass with it, which is moved essentially in the longitudinal direction of the flying object 101 especially during approaching and landing. The mass can be moved e.g. backwards during the approach or landing and thereby influencing to the lifting force of the flying object 101 and making the landing and/or docketing easier. Still the angle of incidence of the wing of the flying object 101 may be changeable during operation. It can be e.g. increased during approaching or landing thereby influencing to the lifting force of the flying object 101 and making the landing and/or docketing easier. Figure 3 illustrates a principle of an exemplary fly control method 300 according to an advantageous embodiment of the invention, where during a power generating phase the flying object 101 may fly different kinds of patterns 301 (like eights) upwind and downwind of the ground station. The flying object 101 is sequentially pulled up by a wind, which causes reeling out the cable 105 from the reel and thereby generating power via a power extractor (generator or towing device functioning as a generator), and sequentially glided towards ground, e.g. when the force in the cable is low or if the cable is reeled by the towing device. As it is illustrated in Figure 3, the transferring means 103 is configured to introduce or transfer the cable 105 or at least a loop of the cable to pass the first supporting point 107 before or during the towing, but also during the energy production phase. Alternatively, especially when comprising the (mobile) first supporting point 107, the transferring means 103 may move the first supporting point 107 into the more advantageous position (depending e.g. of the wind or positions of other possible flying objects), such as in the vicinity of the supporting means 102 or to be introduced via the second supporting point 1 10 to the flying object. Again it is to be noted that the towing device and/or power extractor 106 may locate either in the vicinity of the supporting means 102, or in the vicinity of the first supporting point 107, such as in the end of the path 104.

Figures 4A-4B illustrate an exemplary power generation arrangement 400 or wind park for generating wind power comprising numbers of the systems 100, 300 according to an advantageous embodiment of the invention. The wind park 400 advantageously comprises plurality of paths 104, like rails, along which one or more transferring means 103 can be moved and thereby establish plurality of the first supporting points 107 for plurality of the flying objects 101. Thereby the wind park according to the invention can utilize numbers of the flying object at the same time independently from each other.

The system 100, 300, 400, 700 may advantageously comprise positioning means for positioning the flying objects 101. The positioning means may be e.g. GPS device in the flying object 101 , which is configured to keep the flying object in a desired area with the help of a fly controlling means. According to an embodiment the flying object 101 may comprise fly controlling means, such as ailerons for controlling the flying direction and flying speed of the object 101. Still according to an embodiment the positioning means may also be implemented by radio transmitters 401 , which a radio receiver at the flying object is configured to listen and thereby determining its position and controlling the flying direction, speed or other flying parameters. According to an embodiment the flying object may also transmits its position data to the control system 402, when the system 402 may be configured to control the fly of the flying object at least partially based on the position of said flying object, such as winching the flying object higher or loosening the cable and thereby lowering the flying altitude. The radio transmitters 401 may locate e.g. at the end of the paths 104, in connection with the supporting means 102 or other predetermined locations.

As can be seen in Figure 4B the arrangement may comprise plurality of the elongated paths 104 (as a grid), such as rails, along which said transferring means 103 is adapted to move and thereby provide the first supporting point 107 selecting from the plurality of first supporting point candidates 107a- 107d, 207c, 207d taking into account for example the direction of the wind. The system thus allows plurality of flying objects 101 at the same time, since it is possible to utilize plurality of the first supporting point simultaneously. According to an example the first flying object can be launched e.g. from point X1 to upwind direction, whereupon the first supporting point for that launch is advantageously the point 107b, whereas the second flying object can be launched e.g. from point X2 to upwind direction, whereupon the first supporting point for that launch is advantageously the point 107c.

The arm 102 as a supporting means in Figure 4A may locate e.g. at the points marked by X1 in Figure 4B. In other words every point marked by X1 in Figure 4B may comprise its own launching mechanisms, such as transferring means 103 and the supporting means 102, 500, such as the arm or a slide, as is described in Figure 5.

Figure 5 illustrates another exemplary supporting means 500 for supporting the flying object, where the supporting means 500 is a slide 501 sliding in relation to the base of the system 100, 300, 400. The slide 501 is preferably configured to move along a line 502 (such as a rail) before towing in the opposite direction of towing, and providing initial speed for the flying object at the beginning of towing by moving along the line in the direction of towing (similarly as the bending arm described in connection with Figures 1A-1 C). Similarly during the approach of the flying object for landing and/or docking with the slide, the slide 501 is configured at first to move along the line 502 towards the approaching flying object, and at second to move along the line 502 and along with the landing flying object when it is landing and docking with the supporting means 500. In addition, according to an embodiment the supporting means 500 or the slide 501 or the line system 502 along which the slide 501 is configured to move, is hinged around a vertical axis 503 (similarly as the arm), and configured to turn around the vertical axis 503 essentially in parallel with the flying path of the landing flying object. Still, according to an embodiment the supporting means 500 or the slide 501 or the line system 502 along which the slide 501 is configured to move, is arranged to be turned via another, essentially circular line 504, such as a rail having a form of an arc or circle around a vertical axis, so that the slide or the line system 501 is essentially in parallel with the flying path of the landing flying object.

Figure 6 illustrates an exemplary actuating means 600 for compensating possible variations in the tightness of a towing cable 105. According to an embodiment the actuating means may be e.g. a fluidic muscle 603 or the like, the spring rate or rigidity of which can be changed, advantageously during towing, landing and/or the energy production phase of the flying object.

The actuating means 600 advantageously comprises at least one movable supporting point 601 via which the cable 105 is provided from the towing device to the flying object. The movable supporting point 601 is configured to move essentially in the direction 602 of the cable 105 and thereby compensate possible variations (tightening or loosening) in the tightness of the cable 105 induced during the operation, such as compensating the variable tension of the cable induced by turbulence, for example.

In addition according to an embodiment the system 100, 300, 400, 402, 700 is configured to change the tension of the cable 105 in different phases of the towing, flying, approaching and landing of the flying object 101 , such as tightening the tension of the cable at the start of the towing, loosening during approach or lowering the altitude, and again tightening during touchdown and/or docketing. According to an embodiment changing of the tension and/or the spring rate or rigidity of the actuating means can be done automatically. For example the spring rate of the fluidic muscle may be increased during the take-off and decreased during approaching so that effective margin is in desired and operationally reasonable area. In addition the actuating means may be used for triggering the take-off by pulling the movable supporting point 601 and thereby the cable 105 or otherwise co- operating the take-off during towing.

Figure 7 illustrates an example of the elongated path 104 of the system 700 for towing a flying object 101 according to an advantageous embodiment of the invention, wherein the elongated path 104 is a movable elongated path 104. The elongated path 104 may be hinged at a first point 702 in order to allow circular moving path. The movable elongated path 104 comprises advantageously moving means 701 , which allow the moving of the elongated path 104 in a radial or circular manner 1 12a in relation to the first point 702. The moving force may be generated externally (like pulling or pushing the elongated path 104) or the system 700 may comprise engine configured to provide traction power for the moving means (similarly like circularly movable irrigation systems in the fields). The moving means can be implemented in numerous ways and the moving means may comprise wheels, caterpillar treads or e.g. rail or other moving means known from technical area of the transferring means. According to an embodiment the system 700 may also comprise anchoring points 703 for anchoring the elongated path 104 for example during towing in order to prevent any unwanted movements of the elongated path 104. For example the towing cable 105 may cause tension or moment for the elongated path 104 e.g. via the first supporting point 107 and transferring means 103 during towing and thereby bending the elongated path 104, such as bending it upwards or sidewards.

The system 700 with the moving elongated path 104 has numerous advantages, namely it releases almost the whole area of the wind park for other utilizations, like culture. In addition the movable elongated path 104 may be provided with a water pipe ability so that it can be used also for irrigation at the same time.

It is to be noted that according to the embodiments described in this document the system 100, 300, 400, 700 for towing the flying object can be at least partly, but advantageously fully automatized for example for launching, approaching and landing the flying object. The system may be provided e.g. with determination means for determining e.g. wind speed and direction so that for example the first supporting point or arm, as well as the moving elongated path 104 and other devices described above, can be turned into the optimal direction (like in the direction of wind) in relation to the approaching and landing object or for the launching, as an example, and the drawing speed of the cable can be adjusted optimal, like so that the speed of the flying object is above the stalling speed. When the arm is turned in parallel with the wind direction so that the flying object is approaching and landing towards the headwind, the ground speed of the flying object can be kept as minimal as possible. When the wind speed and the stalling speed of the flying object are known the system according to the embodiments can control the reeling speed of the cable so that the wind speed of the flying object is just above its stalling speed. The wind speed and direction can be achieved for example with separate anemometers or the like, or the flying object may be provided with air speed indicator and GPS systems, with help of which the wind speed and direction can be determined.

The same principles for automatically operating the system applies also for other devices, such as moving the transferring means and elongated path, reeling the cable in and out as well as operating the power extractor and actuating means, as an example.

The invention has been explained above with reference to the aforementioned embodiments, and several advantages of the invention have been demonstrated. It is clear that the invention is not only restricted to these embodiments, but comprises all possible embodiments within the general idea and scope of the inventive thought and the following patent claims. For example the system may comprise separate towing device and generator, but according to an advantageous embodiment they may be combined, whereupon the same apparatus may function as a towing device when towing the flying object and as a generator during energy production phase. In addition it is to be noted that the location of the towing device and/or the generator may be chosen freely, so it may locate under or in the vicinity of the supporting means 102, at the free end of the rail 104 or somewhere between the supporting means and the end of the rail, or even according to an embodiment it may be provided in the connection of the transferring means.