Cyclic stick system giving a helicopter speed stability

Details Cyclic stick system giving a helicopter speed stability Cyclic stick system giving a helicopter speed stability

1996-12-05

1999-01-26

Morano, S. Joseph

Aeronautics and astronautics

Aircraft, heavier-than-air

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

244178, 244223, B64C 1300, B64C 1308

Patent

active

058630120

ABSTRACT:
A cyclic stick system for a helicopter or other aircraft includes memories for holding minimum and maximum speed values, a comparator for comparing an air speed V1 with the minimum and maximum speed values, a router for selecting either the air speed V1 or a quiescent speed, a subtracter for obtaining a difference between the output of the router and a reference speed, another router for selecting between the difference and a signal representing an orientation of the stick, and a switch for selecting times when the air speed V1 is to be stored as the reference speed. On the basis of the air speed V1 and under the control of the device for retrimming said cyclic stick, the system acts on the motorization of stick in order to confer on the helicopter apparent longitudinal static stability in terms of forces on the cyclic stick so that to accelerate (or decelerate) and maintain a new higher (or lower) speed. The force applied to the cyclic stick is always in the direction of pushing (or of pulling) outside of any deliberate retrimming action.

REFERENCES:
patent: 3733039 (1973-05-01), O'Conner et al.
patent: 4168045 (1979-09-01), Wright et al.
patent: 4258890 (1981-03-01), Korkosz
patent: 4477876 (1984-10-01), Wright et al.
patent: 4645141 (1987-02-01), McElreath
patent: 4664346 (1987-05-01), Koenig
patent: 4758958 (1988-07-01), Von Gersdorff

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