Pitch control system for variable pitch propeller

Details Pitch control system for variable pitch propeller Pitch control system for variable pitch propeller

B - Operations, Transporting

63

H

121/103, 244/120

B63H 3/00 (2006.01) B64C 11/38 (2006.01)

Patent

CA 1208993

- 21 - Abstract Pitch Control System For Variable Pitch Propeller A pitch control system (10) for a variable pitch propeller effects engine governor (330), control of blade pitch under normal operating conditions and automatically effects direct (beta) control of blade pitch by the power lever (305) throughout a predetermined range of power lever settings, The system is hydromechanical and com- prises a pitch actuator (40) and a pair of con- trol valves (120 and 210), a first of the valves (120) applying a metered fluid pressure from a governor controlled pilot valve to the actuator and blocking that signal and replacing it with a supply fluid pressure at the point of transition from governor to beta control. The second control valve (210) effects a controlled draining of the actuator and connection thereof with the power lever (305).

440572

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