Counter-torque device with ducted rotor and phase modulation of

Details Counter-torque device with ducted rotor and phase modulation of Counter-torque device with ducted rotor and phase modulation of

1994-08-30

1996-10-22

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

244 1N, 415119, B64C 2782

Patent

active

055669077

ABSTRACT:
The blades of the rotor which can rotate in the transverse duct have an angular distribution according to an uneven azimuth modulation given by the following sinusoidal law:

REFERENCES:
patent: 3594097 (1971-07-01), Mouille et al.
patent: 3747343 (1973-07-01), Rosen
patent: 4585391 (1986-04-01), Vuillet
patent: 4626172 (1986-12-01), Mouille et al.
patent: 4626173 (1986-12-01), Mouille et al.
patent: 4809931 (1989-03-01), Mouille et al.
patent: 5131604 (1992-07-01), Yoerkie et al.
Proceedings of the nineteenth european rotorcraft forum 14 Sep. 1993, Cernobbio (Italy) : "A new generation of fenestron fan-in-fin tail rotor on EC 135".
"Noise Reduction by Applying Modulation Principles" by Donald Ewald et al, published in The Journal of Acoustical Society of America, vol. 49, No. 5, 1971, pp. 1381 to 1385.

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