Ducted Fan Vtol Vehicles

• US 20080283673A1
• Filed: 01/10/2006
• Published: 11/20/2008
• Est. Priority Date: 01/10/2005
• Status: Active Grant

• Current Assignee: Urban Aeronautics Ltd.
• Original Assignee: Urban Aeronautics Ltd.
• Inventors: Yoeli, Raphael
• Granted Patent: US 7,806,362 B2
• Time in Patent Office: Days
• US Class Current: 244/23A
• CPC Class Codes: B60V 1/043 the walls being flexible skirt details B60V1/16
• CPC Class Codes: B64C 1/1415 Cargo doors, e.g. incorporating ramps
• CPC Class Codes: B64C 1/22 Other structures integral with fuselages to facilitate loading , e.g. cargo bays, cranes
• CPC Class Codes: B64C 27/08 with two or more rotors
• CPC Class Codes: B64C 27/20 Rotorcraft characterised by having shrouded rotors, e.g. flying platforms
• CPC Class Codes: B64C 29/0025 the propellers being fixed relative to the fuselage
• CPC Class Codes: B64C 29/0033 the propellers being tiltable relative to the fuselage
• CPC Class Codes: B64C 3/40 Varying angle of sweep
• CPC Class Codes: B64D 17/80 in association with aircraft, e.g. for braking thereof
• CPC Class Codes: B64D 7/00 Arrangements of military equipment, e.g. armaments, armament accessories, or military shielding, in aircraft; Adaptations of armament mountings for aircraft dropping bombs or the like B64D1/00; armaments or mountings therefor per se F41
• CPC Class Codes: Y02T 50/10 Drag reduction

Abstract

A vehicle including a fuselage having a longitudinal axis and a transverse axis, two Ducted Fan lift-producing propellers carried by the fuselage on each side of the transverse axis, and a body formed in the fuselage between the lift-producing propellers. Many variations are described enabling deflection and affection of flow streams and reduction of drag and momentum drag which improve speed and forward flight of the vehicle. Also described are unique features applicable in any single or multiple ducted fans and VTOL vehicles.

Claims

1. A ducted fan vehicle comprising:

a forward duct and an aft duct disposed in a fuselage and defining a center body between said ducts;

at least two lift-producing propellers, each disposed in one of said ducts; and

means for causing an air flow portion close to said center body inside said aft duct to separate from said center body.

2. A ducted fan vehicle according to claim 1 wherein said means includes at least one slot formed in a forward-facing wall of said aft duct.

3. A ducted fan vehicle according to claim 2 and further comprising a plurality of said slots arranged circumferentially along said forward-facing wall of said aft duct.

4. A ducted fan vehicle according to claim 1 wherein said means is operative to cause said air flow inside said aft duct to exit said duct at a direction that is generally similar to the direction it had prior to contacting the vehicle'"'"'s surface.

5. A ducted fan vehicle according to claim 1 wherein said means includes means for introducing air flow into any of said ducts.

6. A ducted fan vehicle according to claim 5 wherein said means for introducing air flow is a turbine engine compressor of said vehicle.

7. A ducted fan vehicle according to claim 5 wherein said means for introducing air flow is either of an air pump and a compressor.

8. A ducted fan vehicle according to claim 5 wherein said means for introducing air flow is at least one air scoop connected to any of said ducts.

9. A ducted fan vehicle according to claim 2 wherein the slots are located between the plane of the said lift-producing propellers and the exit from the duct.

10. A ducted fan vehicle according to claim 3 wherein the slots are located between the plane of the said lift-producing propellers and the exit from the duct.

11. A ducted fan vehicle according to claim 2 wherein said means for introducing air flow is at least one air scoop connected to any of said ducts and wherein any of said air scoops, ducts and slots can employ varying cross sectional areas such as to cause related air flow to accelerate and exit at higher velocity through said slots than the free stream velocity of said air when entering through said scoops.

12. A ducted fan vehicle according to claim 1 wherein an aperture is formed in a rearward-facing wall of said aft duct.

13. A ducted fan vehicle according to claim 1 wherein an aperture is formed in a forward-facing wall of said forward duct.

14. A ducted fan vehicle according to claim 1 wherein a first aperture is formed in a rearward-facing wall of said aft duct, and a second aperture is formed in a forward-facing wall of said forward duct.

15. A ducted fan vehicle according to claim 1 wherein the bottom of said fuselage is sufficiently curved to reduce the momentum drag of the vehicle.

16. A ducted fan vehicle according to claim 1 and further comprising a curved cutout employed by the lower forward facing body section of said vehicle and configured to affect air flow thereat to assume a general direction that is similar to the direction it had prior to contacting said vehicle'"'"'s surface.

18. A vehicle according to claim 2 wherein the slot is selectably variable in either of geometry and position.

17. A ducted fan comprising:

a hollow duct;

at least one lift-producing propeller disposed in said duct, wherein at least one aperture is formed in a wall of said duct allowing air to flow between the interior of said duct and the exterior of said duct; and

a curved barrier operative to slide inside said wall between an opened and a closed position thereby controlling the amount of airflow through said aperture.

19. A VTOL vehicle comprising:

a fuselage defining a center body with lower part reshaped to affect airflow in favor of enhancing forward flight by reducing momentum drag; and

at least one lift-producing propeller disposed in an open-ended duct next to the center body, said duct comprising a duct wall having at least one curved barrier enclosing at least portion of said propeller, said curved barrier moveable between open and closed positions.

20. A vehicle according to claim 19 wherein said at least one barrier is moveable along curved slides.