Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Responsive to fixed actuator
Patent
1986-08-06
1987-10-06
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Responsive to fixed actuator
416158, B64C 27605
Patent
active
046979867
ABSTRACT:
A control and actuating system for adjusting the cyclic pitch of the blades of a helicopter automatically and independently in response to the blade gyrating angular position and to the helicopter forward velocity. This action is also independent of the control and adjustment of the collective pitch. The actuation of the blade pitch is performed by means of cams and followers. A hydraulic force-amplifying system is used between the follower/cam assemblies and the blade pitch actuator so as to isolate the follower/cam assemblies from the load carrying components of the system. The displacement signals generated by two cams are combined into a single linear displacement signal which causes a corresponding rotational movement of the blade. The axial position of one cam is determined by the pilot's action and the axial position of the other cam is defined by the helicopter forward speed. The two cams have surfaces that are not of revolution and which remain fixed for a given set combination of pilot's action and forward speed. The blade cyclic pitch variation is caused by the gyration of a housing to which the blades are attached and which contains and encloses the blade pitch control and actuating system.
REFERENCES:
patent: 1427015 (1922-08-01), Pescara
patent: 3031017 (1962-04-01), Arcidiacono
patent: 3525576 (1970-08-01), Dorand
patent: 3756743 (1973-09-01), Robertson
patent: 3799695 (1974-03-01), Yamakawa
patent: 4650400 (1987-03-01), David
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