U.S. Patent Specifications

Abstract

A controllable pitch propeller for an engine including in combination a hub, blades mounted thereon for pitch changing rotation, an electric motor secured to said engine, means to energize and to immobilize said motor at will, a normally stationary eccentric mounted for rotation with the hub axis and drivably associated with said motor and pitch changing gearing operatively connecting said eccentric with said blades.

Citation

(1942), "U.S. Patent Specifications", Aircraft Engineering and Aerospace Technology, Vol. 14 No. 9, pp. 273-274. https://doi.org/10.1108/eb030945