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Sailboard with slotted winglets

Inactive Publication Date: 2013-11-14
KELLER JOHN H
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about a new design for a sailboard hull that improves the lift of the winglet (a part of the hull) that helps the sailor get more speed. The goal is to create a hull that makes the winglet work better.

Problems solved by technology

Also, the flow over the top of the front of the winglet may stop at a slower board speed than desired, while the camber of the winglet is limited by the thickness to length ratio.
However, each winglet has drag from the separation of the water at its nose to pass over and under the winglet, thus if the number of winglets is too large there will be increased drag from this wing grid.

Method used

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  • Sailboard with slotted winglets
  • Sailboard with slotted winglets
  • Sailboard with slotted winglets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027]Referring now to the drawings, and more particularly to FIGS. 1A-1E, a cross section of a side part of a sailboard hull 1 is shown with a preferred embodiment of a winglet 2 with a front slot 3 and a top back slot 6. ‘Front slot’ and ‘forward slot’ are treated as substantially synonymous terms and may be used interchangeably herein. A ‘front slot’ or ‘forward slot’ may include an ‘opening’ or ‘forward opening’ which should also be understood as substantially synonymous. The term ‘top slot’ includes ‘back slot’ and ‘top black slot’. Hereafter a ‘winglet’2 may also be called a ‘slotted winglet’2 to emphasize the presence of a slot above the winglet. Winglet 2 has a length, in a longitudinal direction of the sailboard hull, at least 2 or 3 times its transverse width on each side of attachment to the main body. Thus it is distinguished from a fin or skeg at the side of the hull as in some racing catamaran sailboats. Winglet 2 may be integral with the sailboard hull such that the h...

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PUM

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Abstract

A sailboard hull has at least one pair of winglets or foils beneath the top of the board. Each winglet or foil has above it a slot and allows dynamic lift from both the top and bottom surface of the winglet and reduction of drag when the board is traveling at a transition speed between displacement mode and planing mode. At high planing speed it does not normally have lift from the top surface of the winglet. There may be multiple pairs of winglets or foils. Back slots may be provided at the rear of the sailboard hull providing a higher ratio of winglet width to maximum hull width. A top slot may cover at least half the winglet area, and a winglet may have a camber / slope step on the planing surface.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 12 / 880,360, filed Sep. 13, 2010, which is a continuation-in-part of International Patent Application PCT / US2009 / 057138, which claims priority of U.S. Provisional Patent Applications 61 / 097,836, filed Sep. 17, 2008, and 61 / 165,472, filed Mar. 31, 2009, the priority of the filing date of which applications is hereby claimed. U.S. patent application Ser. No. 12 / 880,360 also claims priority to International Patent Application PCT / US10 / 29785, filed Apr. 2, 2010, which claims priority to U.S. Provisional Patent Application 61 / 166,569, filed Apr. 3, 2009. All of these references are herein incorporated by reference.FIELD OF THE INVENTION[0002]The present invention generally relates to a sailboard / windsurfer hull or other small watercraft hull having winglet(s) with a slot for improving the transition from displacement operation to planing operation and the transition ...

Claims

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Application Information

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IPC IPC(8): B63B35/79B63B1/26B63B1/24
CPCB63B35/7923B63B1/24B63B1/26B63B1/20B63B32/50B63B32/60B63B32/45
Inventor KELLER, JOHN H.
Owner KELLER JOHN H