Patent ID: 8821205

Claim:
A fin configured for attachment to an aquatic sports board, the fin comprising: a top end; a bottom end opposite the top end; a first side surface, the first side surface of the fin having a first degree of curvature; a second side surface opposite the first side surface, the second side surface of the fin having a second degree of curvature different than the first degree of curvature of the first side surface; a leading edge; a trailing edge opposite the leading edge; a protrusion at the bottom end for mounting the fin on the sports board, wherein the protrusion is dimensioned to be received in a cavity on a lower surface of the sports board and configured to support the fin substantially vertically from the lower surface; a virtual chord defined by a straight line joining a center point on the leading edge of the fin to a center point on the trailing edge of the fin, the virtual chord defining an angle of attack of the fin; and a camber line extending centrally between the first and second side surfaces from the leading edge to the trailing edge; wherein the camber line is offset relative to the virtual chord to provide the fin with a camber, and the camber line at any longitudinal distance from the bottom end to the top end is offset and cambered toward only one side of the fin, and wherein the curvature of the second side surface is continuously convex, and the curvature of the first side surface has a first convex curvature and a second concave curvature, such that the first side surface has an oscillating curvature similar to a shallow sine wave.