Helicopter cyclic stick midposition feel indicator

Details Helicopter cyclic stick midposition feel indicator Helicopter cyclic stick midposition feel indicator

1981-11-16

1983-12-20

Frankfort, Charles E.

Aeronautics and astronautics

Aircraft control

Pilot operated

74532, 70199, 244224, B64C 1308, B64C 2902

Patent

active

044212879

ABSTRACT:
To provide the pilot with the "feel" that he is inadvertently moving his cyclic control stick from its midposition when the helicopter is on the ground, and thereby possibly changing the rotor plane from a safe to an unsafe position for ground personnel, a restraint member is provided which includes an over-center spring, and which may be pivoted from its stowed position into an operable position where it bears against the cyclic stick so midpositioned. The over-center spring thereof offers resistance to cyclic stick motion if the pilot inadvertently begins to move the stick forward or laterally of its midposition, but the spring biasing force can readily be overcome by the pilot by manually pushing the cyclic stick forward and thereby cause the restraint member to move to its stowed position.

REFERENCES:
patent: 1338131 (1920-04-01), Hendricks
patent: 1361061 (1920-12-01), Hyland
patent: 1379522 (1921-05-01), Bruner
patent: 1423955 (1922-07-01), Miller
patent: 1440823 (1923-01-01), Fenlon
patent: 2111804 (1938-03-01), Page
patent: 2967681 (1961-01-01), Berquist
patent: 4324151 (1982-04-01), Rudy

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