Counter-torque device with rotor and flow-straightening stator,

Details Counter-torque device with rotor and flow-straightening stator, Counter-torque device with rotor and flow-straightening stator,

1994-08-30

1996-12-31

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft, heavier-than-air

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

415119, 416203, B64C 2782

Patent

active

055886183

ABSTRACT:
A flow-straightener with stationary vanes and aerodynamic profile is mounted downstream of the rotor with blades in the transverse duct passing through the fairing at the tail of the helicopter. The blades of the rotor are distributed angularly about the axis of the rotor with uneven azimuth modulation, such that any angle between two arbitrary blades of the rotor is different from any angle between two arbitrary vanes of the flow-straightener.

REFERENCES:
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patent: 3270953 (1966-09-01), Jerie et al.
patent: 3285502 (1966-11-01), Wooden
patent: 3346174 (1967-10-01), Lievens et al.
patent: 3594097 (1971-07-01), Mouille et al.
patent: 3747343 (1973-07-01), Rosen
patent: 3883268 (1973-05-01), Evans et al.
patent: 3995970 (1976-12-01), Nobuyuki
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.
patent: 5169286 (1992-12-01), Gliebe et al.
Proceedings of the nineteenth european rotorcraft forum 14 Sep. 1993, CERNOBBIO : "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. 1381-1385.

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