Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Impeller rotation speed responsive
Patent
1976-09-20
1978-06-27
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Impeller rotation speed responsive
416 48, 416154, B64C 1138
Patent
active
040971899
ABSTRACT:
A propeller hub supports a plurality of angularly disposed propeller blades which are movable by a hydraulic cylinder between a high pitch position and a reverse position through a low pitch position. Hydraulic fluid is supplied to the cylinder from a governor unit driven by the aircraft engine, and a fluid pressure responsive relief valve controls the pressure of the hydraulic fluid. The pressure responsive relief valve is manually adjustable by the aircraft pilot to change the fluid pressure at which the valve responds in order to change the pitch of the propeller blades. The fluid pressure must be increased above a predetermined normal operating limit for actuating the cylinder against the bias of a spring within the propeller to move the blades to their reverse pitch position. In addition, a centrifugally actuated lock unit prevents actuation of the cylinder and movement of the blades to their reverse pitch position until the speed of the propeller is reduced to a slow idle. The pressure responsive relief valve also incorporated hydraulic means to assure that the valve responds immediately to the pilot's command.
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Hartzell Propeller Inc.
Powell Jr. Everette A.
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