Variable foil keel and sail boat

Details Variable foil keel and sail boat Variable foil keel and sail boat

1976-05-21

1978-02-21

Blix, Trygve M.

Ships

Watercraft with means used in providing sailpower

Having specifically defined hull shape

114140, 114162, B63B 338

Patent

active

040746461

ABSTRACT:
A sailboat, and a variable foil appendage, ie., keel or rudder for a sailboat, the appendage having a central core portion, and movable skin portions on either side thereof, the skin portions being connected to the core portion essentially along the forward and trailing edges of the skin portions, at least one of such connections being movable, and a fluid-operated skin movement control system being provided in the core portion, operation of the control system producing outward bulging or flattening of one or other of the skin portions to form a bulged generally convex profile extending upwardly and downwardly along one side of the core portion, while the skin portion on the opposite side of the core may be bulged or flat, the control system being selectively operable thereby enabling the foil section of the appendage to be changed, as the sailboat comes about from one tack to the other.

REFERENCES:
patent: 1790309 (1931-01-01), Kientz
patent: 1924871 (1933-08-01), Ludington
patent: 2912190 (1959-11-01), MacDonough
patent: 3505968 (1970-04-01), Gorman
patent: 3753415 (1971-11-01), Burtis

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