Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1989-09-06
1992-06-23
Focarino, Margaret A.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244 1713, 244 52, B64C 2782, B64C 2778
Patent
active
051236133
ABSTRACT:
An improved control system for a rotary wing aircraft having a tail assembly comprising an annular duct within the interior of which a variable pitch propeller is concentrically mounted for rotation forwardly of movable surfaces for deflecting the slip stream generated by the propeller transversely of the duct as will provide transversely directed thrust forces for amounts required to counteract rotor torque and provide directional control of the aircraft in azimuth. The improvement comprises a collective pitch torque compensation unit connected between the pilot's rotor collective pitch control and the pitch control actuator of the propeller in which the compensation unit establishes changes in the pitch of the tail propeller that are proportional to changes in the rotor collective pitch in amounts that vary dependent upon the high or low range pitch setting of a pilot operable propeller pitch adjusting switch, whereby compensating thrust forces are automatically generated in counteracting changes in rotor torque created by changes in rotor collective pitch.
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Focarino Margaret A.
Hanger Willard M.
Kannofsky James M.
Piasecki Aircraft Corporation
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