Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1978-10-26
1980-06-10
Frankfort, Charles E.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244235, 244178, 244182, 244196, B64C 1134
Patent
active
042068916
ABSTRACT:
The yaw channel of a helicopter, which includes a yaw servo having a yaw trim valve operable to automatically hold heading, and at cruise speeds alternatively operable to provide controlled yaw for coordinated turns, which is normally disengaged by switches located on the pedals, is selectively allowed to remain engaged at cruise speeds so that if the pilot induces commands in yaw by means of the pedals, the pedal linkage must be forced against the position of the trim piston established by the heading hold or coordinated turn input commands to the yaw trim valve, thereby giving the pilot pedal force feel as a consequence of the resilient connection to the trim piston, which provides an indication to the pilot of the amount of side slip he is creating, thereby to avoid destructive overloading of the tail rotor.
REFERENCES:
patent: 3099421 (1963-07-01), Gerstine
patent: 3711042 (1973-01-01), Rempfer et al.
patent: 3733039 (1973-05-01), O'Connor et al.
patent: 4003532 (1977-01-01), Adams, Sr. et al.
patent: 4067517 (1978-01-01), Barnum
patent: 4078749 (1978-03-01), Johnson, Jr.
Sikorsky Aircraft, U.S. Army Electronics Command, Ft. Monmouth, N.J., Five Week CH-54B AFCS Direct/General Maintenance Course, 9-8-1969, pp. 1-33.
Barnum Ronald E.
Perez Ricardo L.
Tefft Franklin A.
Eisenzopf Reinhard J.
Frankfort Charles E.
United Technologies Corporation
Williams M. P.
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