Patent ID: 8333564

Claim:
A vertical axis wind turbine airfoil, comprising: a leading edge; a trailing edge, wherein the distance between the leading edge and the trailing edge is defined as one; an upper curved surface extending from the leading edge to the trailing edge; a lower curved surface extending from the leading edge to the trailing edge; and a centerline running from the leading edge to the trailing edge, wherein the maximum distance between the centerline and the upper surface is a thickness defined as 0.5 and wherein the airfoil is shaped to have a thickness at specific distances from the leading edge to the trailing edge according to the following chart: Distance Thickness 0 0 0.005 0.07 0.01 0.11 0.05 0.24 0.1 0.34 0.35 0.5 0.60 0.39 0.80 0.22 1.0 0.0.