U.S. Patent Specifications

An adjustable variable pitch propeller comprising a hub mounted upon a drive shaft, said hub being provided with a radial recess, a propeller blade mounted in a sleeve, said sleeve being freely rotatably mounted in said recess, and bearing means adapted to determine the innermost position of the sleeve and eliminate slack in the propeller assembly, said bearing means comprising an adjustable element mounted in the bottom of said radial recess, said element being provided with a bearing surface adjacent the sleeve, and an anti‐friction bearing disposed within said sleeve and co‐operating with said bearing surface.