Aeronautics and astronautics – Aircraft – heavier-than-air – Airplane and cylindrical rotor sustained
Reexamination Certificate
1999-02-16
2001-05-15
Poon, Peter M. (Department: 3643)
Aeronautics and astronautics
Aircraft, heavier-than-air
Airplane and cylindrical rotor sustained
C244S009000
Reexamination Certificate
active
06231004
ABSTRACT:
The present invention relates to an improved form of lifting member using a fluid flow, either of an aerodynamic nature or a hydrodynamic nature. It Is particularly useful for an aircraft, and in particular as a high lift wing which will provide both high lift and thrust for a low speed aircraft, making it attractive for STOL (short takeoff and landing) purposes.
In the past STOL aircraft have depended upon either lift augmentation of an aerofoll wing, for example by blown flaps and/or the use of slats and leading edge flaps, and/or upon the use of a tilt wing construction where an engine is mounted fixed in relation to the wing so that tilting the wing to a higher angle of incidence also tilts the engine to give a measure of vectored thrust. Vectored jet thrust in the context of vertical/short take-off and landing (V/STOL) flight is also known.
The present invention aims to provide a novel way of achieving high lift at low forward speed of an aircraft.
GB-A-885888 discloses the use of a cross flow rotor at various locations in an aerofoll body, and includes in FIGS. 27 and 26 a cross-low rotor embedded in the leading edge of the aerofoll body.
In accordance with the present invention there is provided a lift-generating member comprising a wing-like body defining leading and trailing edges and opposed surfaces which converge towards said trailing edge, and a spanwise extending cross-flow rotor positioned adjacent the leading edge and one of said opposed surfaces to define an air intake region and an air discharge region along the circumferential path of the rotor vanes; wherein the rotor rotates in a direction which carries the rotor vanes in the part of their path which is adjacent said one opposed surface in a direction which extends towards the trailing edge of the wing-like body; characterised In that the surface of the rotor projects proud of the said one opposed surface over at least said air discharge region; and in that the rotor is exposed to air at the leading edge of the wing-like body to define a leading edge of the lift-generating member and to take in air at the front of said body and to discharge it over said opposed surface as a result of rotation of the rotor.
By providing for a differential in efficiency between the rotors on either side of the center line of an aircraft it is possible to control the lift differentially, to give a means of banking the aircraft.
If desired, the rotors may provide not just the lift but also all of the thrust which is required for forward propulsion of the aircraft, in which case differential power to either side of the centre line of the aircraft also provides for a measure of yaw control and for a means of controlling the aircraft in a stable banked turn.
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Flint & Kim, P.A.
Nguyen Son T.
Poon Peter M.
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