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US 6,886,481 B1Granted
Pivotable bulb mounted foil for sailboats
OwnerDouglas W. Lordinventor
Life of this patent
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Abstract
A pivotable deployable bulb mounted foil apparatus for a sailboat can pivot a foil mounted within a keel bulb remotely as needed to provide lateral resistance for the sailboat. The foil or foils can be rotated between a nested position for greater speed when the foils are not needed for lateral resistance in the water to an extended or operative position when needed for lateral resistance. The pivotal bulb mounted foil is especially adapted for use with a canting keel where the sailboat loses its lateral resistance from the keel when the keel is canted.
Claims11
A sailing boat comprising:
- a boat hull, a keel having two sides and extending from said hull, said keel having an elongated ballast bulb thereon;
- a rotatable foil attached to said keel bulb and forming an integral part thereof when in a nested position and being rotatable about a generally perpendicular axis to said keel on both sides of said keel into an open operative position;
- a control member extending through said hull and keel and being operatively attached to said foil to rotate said foil from the nested position forming part of said bulb to the operative position to provide lateral resistance in the water;
- whereby a sail boat keel bulb having an extendable foil maintains low resistance in water when said foil is nested into said bulb and provides lateral resistance for the hull in water when said foil is extended into an operative extended position.
1 more element
Dependencies are inferred from the claim text.