Abstract: The disclosed wind turbine has zero mean camber airfoil blades vertically pivoted at the outer ends of pairs of radius arms. The inner ends of the radius arms are fixed to a rotating mast. Each blade is provided with a steering vane. The deflection of each vane with respect to its associated blade is controlled by a cam toggle mechanism. The disclosed cam toggle mechanism includes a double-faced face cam, having a closed cam track on its upper face and another closed cam track on its lower face. Each cam track consists of two circular dwell portions.

Abstract: A low noise D. C. power supply system that is particularly suited for suping D. C. power from a stationary source to electronics equipment mounted on a rotating assembly. Brush and slip ring assemblies are used to transfer the D. C. power to the rotating assembly and brush noise is minimized by having non-inductive impedences on both sides of the brush and slip ring assemblies. Floating circuits are employed to transfer the D. C. power from the stationary assembly to the rotating assembly with the return reference ground being through the brush and slip ring assemblies to the stationary assembly. Higher than usual voltages are supplied to a capacitor mounted on the rotating assembly to charge the capacitor providing reserve energy storage, providing a voltage margin for further regulation and thus minimizing the effect of brush noise.