Variable pitch aircraft propeller control with two-speed...

Details Variable pitch aircraft propeller control with two-speed... Variable pitch aircraft propeller control with two-speed...

B - Operations, Transporting

64

C

B64C 11/32 (2006.01) B64C 11/30 (2006.01) B64D 35/00 (2006.01)

Patent

CA 2348278

A variable pitch aircraft propeller control uses a two-speed planetary gearbox between a turbine engine and an adjustable pitch propeller. For maximum efficiency, the rotation rate of the propeller is high at aircraft take-off to generate maximum static thrust. However, when at high altitude and at high speed, the propeller rotation rate is reduced to hold the vector sum of the aircraft forward speed and the propeller rotational tip speed at the speed that results in the highest efficiency for the propeller. The two- speed transmission supplies these two gear ratios. At takeoff and low altitude flight, a low gear ratio is used. At high altitude, a high gear ratio is used. The gear ratio may be manually selected by the pilot, or automatically changed by the propeller controller to obtain the best combined efficiency for the engine and the propeller.

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