Cross-References to Related Applications

This application claims priority from U.S. Provisional Application Serial Number 62/448,891 filed January 20, 2017, which is hereby incorporated herein by reference in its entirety.

Field of the Invention

The present invention relates to a multi -ducted centrifugal fan VTOL aircraft.

Background of the Invention

Currently-available VTOL drone aircrafts are of the multi-rotor type that suffer from limited flight time and payload capacity due to two main reasons: their electrical operation which requires heavy batteries that must be recharged over a period of time, and the inefficiency of the use of rotors or propellers that do not provide high amounts of overall lift. They cannot accommodate the use of fuel (e.g. gasoline) for quick mission turnaround time and must use additional pre-charged batteries. The weight of the batteries limits the amount of payload they can carry, as well as the operational flight time, because batteries do not have a high energy capacity in relation to their weight like fuel does. The current aircraft typically have exposed rotors or propellers that create safety hazards to personnel and property.

It is thus an aim of the present invention to address at least one of these issues.

Brief Description of the Figures

Fig. 1 depicts an aspect of a VTOL aircraft of the invention.

Fig. 2 depicts a bottom view of the VTOL aircraft of the invention.

Fig. 3 depicts a top view of the VTOL aircraft of the invention. Fig. 4 depicts an exploded view of the VTOL aircraft of the invention.

Fig. 5 depicts a bottom view of the VTOL aircraft of the invention.

Fig. 6 depicts a top view of the VTOL aircraft of the invention.

Fig. 7 depicts a cross-sectional view of the VTOL aircraft of the invention.

Fig. 8 depicts a perspective bottom view of a two outlet VTOL aircraft.

Fig. 9 depicts a perspective top view of a two outlet VTOL aircraft.

Brief Summary of the Embodiments of Invention

A VTOL aircraft having thrust and directional control comprises a main body. The main body has an upper shell in a shape of a parabola, with the shape of a parabola facing and expanding into a downward-facing end. The upper shell of the main body has a top opening in a shape of a circle. The main body also has a bottom plate in a shape of a flat circle, sealed to the downward- facing end of the upper shell of the main body. The top opening of the upper shell of the main body provides an inlet for air to enter into the housing. The upper shell of the main body has at least one opening.

A fan provides a centrifugal flow of air. The fan has a central hub, and a plurality of blades extends radially outward from the central hub. The fan is mounted to the bottom plate of the main body.

At least one duct allows and directs air flow. At least one nozzle allows for exhaust release. Each nozzle is attached one each of the ducts. Each nozzle has a turn measuring 90° and facing downward from its respective duct. Each nozzle has an end at which is a vane for redirecting airflow. Detailed Description of the Embodiments of the Invention

First depicted in Fig. 1, a VTOL aircraft 20 comprises a housing 25. The housing 25 comprises a main body 30. The main body 30 has an upper shell 35 in a shape of a parabola, with the shape of a parabola facing and expanding into a downward-facing end 35a. The upper shell 35 of the main body 30 has a top opening 40 in a shape of a circle. The main body 30 also has a bottom plate 45 in a shape of a flat circle, sealed to the downward-facing end 35a of the upper shell 35 of the main body 30. The bottom plate 45 has a top side 45a (Fig. 4) and a bottom side 45b (Fig. 2). The top opening 40 of the upper shell 35 of the main body 30 provides an inlet for air to enter into the housing 25. The upper shell 35 of the main body 30 has at least one opening 50, for instance a set of four openings 50. The set of four openings 50 each has a shape of an oval. As illustrated in Fig. 3, each of the set of four openings 50 is placed around the upper shell 35 of the main body 30 at 90° to each other.

A fan 55 (Fig. 6) provides a centrifugal flow of air. The fan 55 has a central hub 60 (Fig. 6), and a plurality of blades 65 (Fig. 6) extends radially outward from the central hub 60. The fan 55 is mounted to the top side 45a of the bottom plate 45 of the main body 30. An attachment 120 for landing the VTOL aircraft 20 is attached to the bottom side 45b of the bottom plate 45 of the main body 30, as depicted in Figs. 5 and 7.

At least one duct 70 (Figs. 1 and 3), for instance a group of four ducts 70, allows and directs air flow. Each of the group of four ducts 70 has a cross-section having a shape of an oval. Each of the group of four ducts 70 has a first end 75 and a second end 80. The first end 75 of each of the group of four ducts 70 fits into one of the set of four openings 50, and the second end 80 of each of the group of four ducts 70 extends horizontally outward therefrom. Each of the group of four ducts 70 has a width 85 and a height 90 (Figs. 1 and 3). The width 85 of each of the group of four ducts 70 decreases from the first end 75 to the second end 80 of each of the group of four ducts 70. The height 90 of each of the group of four ducts 70 remains constant from the first end 75 to the second end 80 of each of the group of four ducts 70.

As illustrated in Figs. 4 and 7, at least one nozzle 100, for instance, a group of four nozzles 100, allows for exhaust release. Each of the group of four nozzles 100 has a cross-section having a shape of an oval. Each of the group of four nozzles 100 has a first end 105 attached to the second end 80 of one of each of the group of four ducts 70. Each of the group of four nozzles 100 has a turn 115 (Figs. 4 and 7) measuring 90° and facing downward from the second end 80 of each of the group of four ducts 70. Each of the group of four nozzles 100 has a second end 110 at which is a vane 95 for redirecting airflow.

In a variant, the size of the top opening 40 of the main body 30 is 87.5% of the size of the fan 55. Each of the four ducts 70 is 15.6% of the size of the top opening 40 of the main body 30. Each of the second ends 80 of each duct 70 is 50% of the size of the first ends 75 of each duct 70. Each of the second ends 80 of each duct 70 is 7.8% of the size of the top opening 40 of the main body 30.

In another variant, depicted in Figs. 8 and 9, a VTOL aircraft 200 comprises exactly two outlets for thrust. The VTOL 200 has a housing 25 and comprises a main body 30. The main body 30 has an upper shell 35 in a shape of a parabola, with the shape of a parabola facing and expanding into a downward-facing end 35a. The upper shell 35 of the main body 30 has a top opening 40 in a shape of a circle. The main body 30 also has a bottom plate 45 in a shape of a flat circle, sealed to the downward-facing end 35a of the upper shell 35 of the main body 30. The top opening 40 of the upper shell 35 of the main body 30 provides an inlet for air to enter into the housing 25. The upper shell 35 of the main body 30 has two openings 50. The set of two openings 50 each has a shape of an oval. Each of the two openings 50 is placed around the upper shell 35 of the main body 30 at 180° to each other, facing each other.

As with the previous variant, a fan provides a centrifugal flow of air, similar to Fig. 6. The fan has a central hub, and a plurality of blades extends radially outward from the central hub. The fan is mounted to the top side of the bottom plate 45 of the main body 30.

Two ducts 70 allow and directs air flow. Each of the ducts 70 has a cross-section having a shape of an oval. Each of the ducts 70 has a first end 75 and a second end 80. The first end 75 fits into one of the set of the openings 50, and the second end 80 of each extends horizontally outward therefrom. Each of the ducts 70 has a width and a height 90. The width remains constant from the first end 75 to the second end 80 of each duct 70. The height 90 of each of the ducts 70 remains constant from the first end 75 to the second end 80 of each of the ducts 70. Similar to Figs. 4 and 7, at least one nozzle 100, allows for exhaust release. Each of the nozzles 100 has a cross-section having a shape of an oval. Each of the nozzles 100 has a first end 105 attached to the second end 80 of one of each of the ducts 70. Each of the nozzles 100 has a turn 115 measuring 90° and facing downward from the second end 80 of each of the ducts 70. Each of the nozzles 100 has a second end 110 at which is a vane 95 for redirecting airflow.

The advantages of the invention are that it provides directed airflow of a VTOL aircraft, thus providing a greater lift and thrust compared to that of current technology. There is less of a need for multiple motors and propellers, thus also reducing fuel consumption and output of carbon emissions. In addition, the nature of the centrifugal fan creates evacuation of the air in the housing by sweeping away the boundary layer of air, thereby greatly reducing the air pressure immediately above the bottom plate. This creates higher pressure of ambient air below the bottom plate to exert force in an upward direction, increasing lift greatly.