Sailboard with slotted winglets
OwnerJohn H. Kellerinventor
Life of this patent
Estimating the term…
Abstract
A winglet in a planing hull for sailboards with longitudinal length at least three times its transverse width, or a top slot that covers at least half the winglet area, and a forward slot and or a top slot, which allows dynamic lift from both the top and bottom surface of the winglet when the board is traveling at a transition speed between displacement mode and planing mode, but at high planing speed it does not normally have lift from the top surface of the winglet. This winglet may have a camber/slope step on the planing surface. In addition the transverse section of the nose of the hull can have the shape of an upside down wing.
Claims25
A sailboard hull comprising
- at least one set of winglets, whose length is at least 3 times the winglet width, with a forward slot in the front of said winglet and/or a slot on top of said winglet, and
- a bottom surface in front of said forward slot, which acts as a planing surface and wherein said forward or top slots allows the winglet to have lift both on the top and bottom of said winglet when the board is transitioning from displacement mode to planing mode.
A sailboard hull comprising at least one set of winglets in the shape of a hydrofoil, with a top slot, which covers at least half of the said winglets.
A sailboard hull having a winglet and surface forming a front slot above said winglet wherein, in a displacement or transitional mode, said surface causes water flow over a top surface of said winglet to produce Coanda lift and wherein, in a planing mode, a bottom of said winglet provides a planing surface.
A sailboard hull having a winglet configured such that, in a displacement or transitional mode, said surface causes water flow over a top surface of said winglet to produce lift and wherein, in a planing mode, a bottom surface of said winglet provides a planing surface.
Dependencies are inferred from the claim text.