An aquatic sports board adapted for riding ocean waves, comprising: an elongated board body having an upper surface and a lower surface; and a plurality of fins secured to 5 the lower surface, wherein at least one of the fins is a side-fin adapted to act like a foil with respect to a fluid flow of water, wherein the side-fin foil comprises: a first side surface, a leading edge, a second side surface opposite the first side surface, a trailing edge opposite the leading edge, and a virtual chord in the form of a straight horizontal line passing from a center point on the leading edge of the side-fin to a center point on 10 the trailing edge of the side-fin, wherein the virtual chord is part of a vertical plane passing through the respective center points of the leading edge and trailing edge of the fin, wherein the first side surface of the side-fin has a first degree of horizontal curvature, and the second side surface of the side-fin has a second degree of horizontal curvature different than the first degree of horizontal curvature of the first side surface, and the 15 difference in the degree of curvature between the second side surface and the first side surface is such that the foil of the side-fin is cambered, and further wherein the horizontal curvature of the second side surface is continuously convex, and the horizontal curvature of the first side has a first convex curvature and a second concave curvature adjacent the first convex curvature, such that the first side surface of the side-fin has an oscillating 20 curvature similar to a shallow sine wave.
Low-drag fin and foil system for surfboards
2016-01-14
Patent
Elektronische Ressource
Englisch
IPC: | B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS |