Wind powered rotating device

An omni-directional windmill device comprising, a plurality of blades circumferentially symetrically disposed with respect to each other,

• each of said blades having a lower edge and upper edge, each of said blades having a wind reaction surface being arcuate in transverse cross section and helically formed longitudinally from said lower to said upper edge, said lower edges lying on a circle, said upper edges having one end which terminates at a common location within a projection of said circle on the plane of said edges, each of the upper edges curving arcuately from said common location to a point, the locus of which points lie on a circle radially spaced from said common location, and means to mount said device for rotation.