Fin Patent

Abstract

A fin or finlike structure attached at its base to a hydrofoil or watercraft having one or more channels running along its side surfaces at either a horizontal angle or an acute angle as measured from the intersection of the fin's leading edge and its base. These channels may be arranged side-by-side, separated by the side surfaces of the fin or finlike structure, or separated by flanges or convex shapes in a fashion similar to a true ‘spoiler’ in automobiles. As water moves through these channels it is compressed which consequently creates a drop in pressure and generates a significant increase in speed when compared with a fin or finlike structure having traditionally foiled or flat surface or surfaces. The channels and, when applicable, flanges or convex shapes generate speed, reduce drag, provide additional stability, drive through turns, maneuverability, responsiveness, and, when extending at an acute angle away from the intersection of the leading and base edges, lift. The channels, flanges or convex shapes may be of any acute angle, curvature, number, orientation, shape, size, symmetry and type so long as those characteristics ensure the flow of water through these comparatively narrow ways at increased velocity and with intended direction off the trailing edge and, depending on their orientation, the tail-end, or tip, of the fin. This invention has particular application to the field of wave-riding vehicles such as surfboards, sail boards, body boards, paddle boards, and windsurfing boards but also it will be apparent that the invention has further application to the broader field of watercraft in general.

Dependencies are inferred from the claim text.