No-back apparatus for propeller pitch control

Details No-back apparatus for propeller pitch control No-back apparatus for propeller pitch control

1988-07-28

1990-01-02

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

416153, 416160, B64C 1134

Patent

active

048909793

ABSTRACT:
An improved no-back mechanism for propeller pitch control comprises a brake which resists motion of a first member and a uni-directional coupling between the first member and a drive connecting a pitch control prime mover to an adjustable pitch propeller. The coupling permits limited movement of the drive with respect to the first member during back driving as in dither cycling of the blade while coupling the drive and first member for braking the back driving after the limited movement. As a result, dither cycling can occur during normal operation without release or slipping of the brake, thereby effecting a substantial wear reduction of brake plates of the brake.

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