Patent ID: 8333561

Claim:
A wind turbine comprising: a main tower; an upper set and a lower set of transverse mounting arms, each set including at least four transverse mounting arms mounted on and supported by the main tower; at least two sail assemblies each of which is mounted between one of the at least four transverse mounting arms of the upper set and one of the at least four transverse mounting arms of the lower set, each sail assembly comprising: a sail mast defining a vertical axis of rotation, at least two sail arms mounted on and supported by the sail mast, the at least two sail arms including an upper sail arm and a lower sail arm; and a plurality of wings mounted to the upper sail arm and the lower sail arm so as to rotate about the vertical axis of rotation in response to wind; wherein each wing has a flat side and an opposing elliptical side; and a hydraulic pump configured and arranged to generate a constant volume hydraulic output in response to rotation of the the plurality of wings about the vertical axis of rotation.