Sailboat rotatable keel appendage
US6796259B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Aug 23, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63B41/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
For eliminating the dynamic drag of the member which supports the ballast by completely enveloping it with a indispensable component of the sailing vessel, namely, the hollow rotatable monolithic rigid hydrodynamic fin, and thereby reducing the dynamic drag of the canoe body when it is sailing. The elongated four-sided symmetrical diamond shaped ballast support is adapted to be fixed to the interior of the canoe body. The top of the rotatable fin enters into the interior of the canoe body so that the water turbulence is substantially less than in the prior art when the top of the rotatable fin is spaced from the bottom of the canoe body. With sliding convex/concave contact, the rotatable fin is laterally supported by the stationary diamond shaped member. A first and second cylinder are fixed to the canoe body sole and canoe body cabin top to provide strong support to the rotatable fin and ballast. An energy analysis explains how a reduction in the leeward drift will increase the forward speed of the canoe body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.