Propeller pitch control

Details Propeller pitch control Propeller pitch control

1990-09-04

1993-05-25

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

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

Impeller rotation speed responsive

416129, 416154, 416156, 416162, B65H 300

Patent

active

052134717

ABSTRACT:
The invention concerns a system for controlling an aircraft propeller. A hydraulic motor controls pitch of the propeller blades. The propeller blades are characterized by the absence of feather-inducing counterweights. An overspeed governor senses when propeller speed exceeds a limit, and, in response, assumes control of the hydraulic motor and drives the blades toward a coarsened pitch position, which reduces the propeller speed. In another form of the invention, a mechanical brake can override the hydraulic motor and mechanically retard a rotating gear, which causes the propeller blades to move toward a coarsened pitch.

REFERENCES:
patent: 2667228 (1954-01-01), Wood
patent: 3024848 (1962-03-01), Chilman
patent: 3551069 (1976-12-01), Morris
patent: 3900274 (1975-08-01), Johnston
patent: 4711615 (1987-12-01), Rusu
patent: 4878809 (1989-11-01), Ames
patent: 4934901 (1990-06-01), Duchesneau
patent: 4936746 (1990-06-01), Mayo
patent: 5019006 (1991-05-01), Schneider
patent: 5100729 (1991-04-01), Adamson

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