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US 6,349,659 B1Granted
Sailboat rotatable keel appendage
OwnerFrederick E. Hoodinventor
Life of this patent
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OwnerFrederick E. Hoodinventor
Estimating the term…
A Rotatable Keel Appendage comprising a conical hollow support fixed to a sailboat hull into which is juxtapositioned a rotatable cone member which supports a fin keel carrying a heavy ballast bulb. The rotatable cone member has a threaded shaft at its peak which has a diameter greater than the thickness of the fin and is lockable to the fixed appendage conical hollow support by a nut on the threaded shaft. In another embodiment, the rotatable cone member carries two fins, in either spaced parallel relationship or in spaced aligned relationship. Mathematical Formulas for Energy Balance are developed to establish that a tacking sailboat with the appendages in the Specification will hydrodynamically generate forces to both decrease the leeward drift and increase the forward velocity of the hull. Methods for sailing more quickly to reach a windward destination are set forth using the appendages in the specification.
A sailing vessel having a canoe body, a waterline therearound and an appendage depending therefrom, said appendage comprising a hollow member, a portion of the interior of said hollow member having a cylindrical surface, means for fixing said hollow member to said canoe body, a rotatable member juxtapositioned to and adapted to mate with said cylindrical interior surface of said hollow member, a shaft fixed to the upper portion of said rotatable member, means rotating and stopping said shaft to a selective angular displacement in said hollow member, a plate member fixed to the bottom of said rotatable member and means attaching at least one fin to said plate member perpendicular to the plane of said waterline, the axis of said rotatable member being perpendicular to said plate member.
A sailing vess competing a canoe body, a waterline therearound;
Dependencies are inferred from the claim text.