Automatic flight control means for rotary wing aircraft having a

Details Automatic flight control means for rotary wing aircraft having a Automatic flight control means for rotary wing aircraft having a

1975-11-24

1977-02-01

Kunin, Stephen G.

Aeronautics and astronautics

Aircraft, heavier-than-air

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

2351502, 244182, B64C 1144, B64C 2770

Patent

active

040058352

ABSTRACT:
An automatic flight control apparatus for a rotary wing aircraft for controlling the flight condition by utilizing a signal representing the air speed of the aircraft which is added to a bias signal corresponding to the attitude of the aircraft in hovering condition, which added signal is used as a "trim value" signal representing the attitude of the aircraft in a balanced relation to air speed at every instance. A signal representing the difference between said trim value signal and the attitude signal is used as an attitude/speed error signal and is added with the signal representing the difference between the ground speed and the set speed for performing control of the aircraft condition. Also, in order to provide true air speed utilizing a detecting means of the Pitot tube type, when the flight speed is below a predetermined value, a ground speed signal is added with a stored signal representing the difference between the air and ground speeds and the added signal is used instead of the air speed signal to overcome the inaccuracy of the Pitot tube at low speeds.

REFERENCES:
patent: 3105660 (1963-10-01), Lenefsky
patent: 3868497 (1975-02-01), Vietor

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