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US 2014/0193253 A1Published application
Propeller Blade With Relatively Movable Counterweight
AssigneeHamilton Sundstrand Corporation
InventorPaul A. Carvalho
Life of this patent
Estimating the term…
Abstract
A propeller rotor has a hub mounting a plurality of blades. A counterweight is movably mounted on the blade. A pitch change mechanism for changing an angle of incidence of an airfoil is associated with each of the blades. The counterweight twists the blades toward an increased pitch direction should the pitch change mechanism fail. A stop member stops rotation of the counterweight as the blade moves to a feather position.
Claims10
A propeller rotor comprising:
- a rotor mounting a plurality of blades, said blades having a root mounted in a hub of said rotor and a counterweight movably mounted on said blades;
- a pitch change mechanism for changing an angle of incidence of an airfoil associated with said blades and said counterweight for biasing said blades toward an increased pitch direction should said pitch change mechanism fail;
- and
- a stop member for stopping rotation of said counterweight and said counterweight with said blade as said blade moves to a feathered position.
1 more element
A method comprising:
- mounting a plurality of blades in a hub of a rotor and movably mounting a counterweight on each said blade;
- changing an angle of incidence of an airfoil associated with each of said blades with a pitch change mechanism, and said counterweight twisting said blades toward an increased pitch direction should said pitch change mechanism fail;
- and
- stopping rotation of said counterweight when said blade moves to a feather position.
1 more element
Dependencies are inferred from the claim text.