Ducted tail rotor for rotor craft

Details Ducted tail rotor for rotor craft Ducted tail rotor for rotor craft

1993-03-24

1994-04-26

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

416203, 415119, B64C 1106

Patent

active

053061195

ABSTRACT:
A ducted fan-type tail rotor of a rotor craft in which the tail rotor is surrounded by a tubular duct is provided which includes at least six rotor blades, and pitch horns, each mounted to the respective rotor blades. Each pitch horn is swingable to change a pitch angle of the rotor blade. Some of the pitch horns, the number of which is about a half of the total number of the pitch horns, are mounted to a first type of the rotor blades at a mounting angle larger than a reference mounting angle required to obtain a predetermined thrust, and the remainder of the pitch horns are mounted to a second type of the rotor blades at a mounting angle smaller than the reference mounting angle.

REFERENCES:
patent: 872307 (1907-11-01), Sargent
patent: 4174137 (1979-11-01), Ferris
patent: 4253800 (1981-03-01), Segawa et al.
patent: 4281966 (1981-08-01), Duret et al.
patent: 4626173 (1986-12-01), Moville et al.
patent: 4863351 (1989-09-01), Fischer et al.

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