Ducted fan and pitch controls for tail rotor of rotary wing airc

Details Ducted fan and pitch controls for tail rotor of rotary wing airc Ducted fan and pitch controls for tail rotor of rotary wing airc

1994-07-11

1995-12-26

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

416244R, 416245R, B64C 2748, B64C 2782

Patent

active

054782040

ABSTRACT:
A tail rotor for a rotary wing aircraft is located in a laterally directed duct located at the end of a tail cone extending rearward from the aircraft cabin and at the base of an empennage extending upward from the duct. The rotor includes a rotor shaft driveably connected to a power source, a rotor hub connected to the rotor shaft, a rotating control shaft, a stationary control shaft, and an actuator connected to the stationary control shaft for moving the rotating control shaft axially. The rotor hub includes rotor arms each supporting a pitch shaft-blade spar assembly for pivotable movement about a pitch axis. A pitch beam supports flexures, each connected to a pitch arm offset laterally from the associated pitch axis. The flexures driveably connect the pitch arms to the pitch beam and transmit pitch control motion to the blades as the pitch beam moves along the rotor axis. Pitch bearings, on which the pitch shafts turn about the pitch axes, are supported on a rotor hub shell fixed to the rotor hub.

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patent: 4639284 (1987-01-01), Mouille et al.
patent: 5096381 (1992-03-01), Svenning
International Search Report/PCT/US92/06441/31 Jul. 1992/The Boeing Co.

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