Patent ID: 7309213

Claim:
A wind sail receptor comprising, first and second wind sail receptor blade sections that each have from three to five radially spaced identical blades, and said wind sail receptor sections are stacked and connected at their centers, forming a centered rear hub, and said blades are each formed to have an essentially straight leading edge with a rounded trailing edge that is adjacent to an inner end that is connected to the rear hub and terminates, at an outer end, in a straight edge that extends to said blade end, and each blade has a selected curve across their mid section that is determined by a relationship where the axial distance between the rear hub and a forward disk that is less than one to the length of a blade side from its connection to said rear hub to a blade end that is coupled to said forward disk; with ends of each blade opposite to its connection to said rear hub secured, at equal radial intervals, to equal spaced points around said forward disk; an axle secured to said wind sail receptor sections rear hub and forward disk and extends out from either or both said rear hub and forward disk; bearing means for mounting said axle to turn freely; and means, connected to turn or be turned by said axle.