Patent ID: 8657575

Claim:
A method of harvesting energy from a moving, compressible fluid stream, said method comprising: producing a wing structure comprising a single airfoil element having a leading edge, a trailing edge to which no trim bias member is attached, and a cross-sectional shape that is operative to cause the aerodynamic lift of said single airfoil element when it is exposed to the moving, compressible fluid and a stand-off arm that is pivotably connected to said single airfoil element at a pivot that is spaced away from said leading edge; fixing said wing structure to a mast in a vertical orientation to produce a wind fin structure that is operative to yaw about said mast in response to a change in the direction of the moving, compressible fluid stream; exposing said wind fin structure to the moving, compressible fluid stream to produce mechanically-unassisted oscillation, thereby causing said mast to automatically pivot back and forth at an oscillating frequency; converting the back and forth movement into unidirectional rotation to produce motive power; and providing said motive power to an electricity generator.