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US 6,595,151 B2Granted
Planing sailboard
AssigneeK2 Keller Consulting, LLC
InventorJohn H. Keller
Life of this patent
Estimating the term…
Abstract
High performance of a sailboard is achieved over a wider range of wind and water conditions by providing a hull having two or more planing surfaces which may differ in shape and/or aspect ratio. Drag due to suction at steps between planing surfaces is reduced by venting to the air. Cusp shaping of the respective planing surfaces can reduce and stabilize the angle of attack at the displacement/planing transition without causing fore-and-aft pitching effects known as porpoising.
Claims21
A sailboard hull comprising:
- apparatus for attaching a sail mast,
- apparatus for attaching foot straps,
- a fin for resisting lateral force of a sail,
- first planing surface,
- a second planing surface extending below said first planing surface and forming a step at a juncture of said first planing surface and a rear portion of said second planing surface wherein said second planing surface includes a groove aligned with a fin extending from said first planing surface, and
- means for reducing suction behind said second planning surface.
3 more elements
A sailboard hull comprising:
- apparatus for attaching a sail mast,
- apparatus for attaching foot straps,
- a fin for resisting lateral force of a sail,
- a first planing surface,
- a plurality of second planing surfaces extending below said first planing surface and forming a step at a juncture of said first planing surface and a rear portion of said second planing surface including ridges extending from an end of said second planing surfaces along and below said first planing surface, and
- means for reducing suction behind said second planing surfaces.
3 more elements
Dependencies are inferred from the claim text.