Propeller pitch control

Details Propeller pitch control Propeller pitch control

B - Operations, Transporting

64

C

B64C 11/40 (2006.01) B64C 11/32 (2006.01) F01D 7/02 (2006.01)

Patent

CA 2048799

13-DV-9891 ABSTRACT OF THE DISCLOSURE 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. D33

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