Patent ID: 7275719

Claim:
Wind driven apparatus for an aerial power generation system for generation of power from the wind, comprising: a driven element including a trapezoidal sail portion, an upper spar, a spaced lower spar, and a plurality of spaced battens, said driven element having a high force configuration and a low force configuration, a pitch angle and an azimuth angle, said driven element having, when in said high force configuration, an airfoil shape, said sail portion having a leading edge, a trailing edge, and a camber, said upper spar being connected to and extending laterally along said leading edge of said sail portion, said lower spar being connected to and extending laterally along said trailing edge of said sail portion, and said battens being connected to and extending longitudinally along said sail portion for flattening said sail portion, means, connected to said sail portion, for changing said driven element between said high force and low force configurations while in flight, and means for controlling said camber of said sail portion while said sail portion is in flight, whereby said camber is increased when said driven element is in a high force configuration and said driven element is flattened when said sail portion is in a low force configuration, and whereby said means for changing changes said sail portion to a said high force configuration to generate power, and said means for changing changes said sail portion to a said low force configuration to pull said sail portion upwind.