Patent ID: 8734084

Claim:
An apparatus for converting wind energy into mechanical energy comprising: a floor and a roof; a shaft which extends into the floor and the roof; an unarticulated vertical wing configured to oscillate around the axis of the shaft and having a height slightly less than the distance between the floor and the roof thereby allowing sufficient clearances between itself and the roof and between itself and the floor so as to be able to rotate freely, and having a horizontal outline developed by: (a) cutting out an outline from a middle section of an outline of a streamlined symmetrical airfoil close to NACA 0040, said cut outline bordered forward by a circle having an axis the same as the shaft and a diameter equal to the width of the airfoil, and bordered aft by a circle having a radius 40±5% of the distance from the axis of the shaft to the aft-most point of the symmetrical airfoil; (b) copying the outline of the middle section, rotating the copy 53±5 degrees around the shaft, and combining the outline of the middle section and the rotated copy; a forward nacelle and an aft nacelle, both of which extend from the floor to the roof and are connected to each and are positioned fore and aft, respectively, at a distance apart from the oscillating wing such that their chords if extended would pass through the axis of the shaft, having horizontal outlines formed by remaining sections of the streamlined symmetrical airfoil used to develop the oscillating wing, wherein corners of the forward nacelle are trimmed such that the oscillating wing can rotate freely 35 degrees to each side; and, two outside wall airfoils each having a horizontal outline of an airfoil close to NACA 0020 extending from the floor to the roof and connected to each, and having chord lengths that are each approximately 66% of the length of the airfoil close to NACA 0040 used to create the outlines of the forward nacelle, oscillating wing and aft nacelle, and are parallel to it, and each having a leading edge that are positioned approximately 12.5% the length of the airfoil close to NACA 0040 used to create the outlines of the forward nacelle, oscillating wing and aft nacelle, aft of the leading edge of the forward nacelle.