Patent ID: 7726934
Filing Date: 2010-06-01
Classification: F03D,F05B,Y02E,Y10S

Abstract:
1. A vertical axis wind turbine comprising: a plurality of blades spaced from and rotatable around a rotor shaft vertical to ground; said plurality of blades arranged in a helical pattern about said rotor shaft; each said blade having a top, a bottom opposed to said top, a leading edge, a trailing edge, a front surface, and a back surface, wherein said leading edge is in the shape of an airfoil; a hub having a plurality of blade attachment arms radially extending from said rotor so that each said blade is secured to one of said attachment arms; wherein each blade is angled such that said top of each blade is closer to said rotor shaft than said bottom of said blade; and wherein each said blade is attached approximately halfway between the top of the blade and the bottom of the blade to a tapered arm which is pivotally attached to said blade attachment arm.