Ships – Apparatus held by or attached to rider to control sailboard... – Foot strap means
Patent
1987-01-27
1989-11-28
Peters, Jr., Joseph F.
Ships
Apparatus held by or attached to rider to control sailboard...
Foot strap means
114140, B63B 338
Patent
active
048830119
ABSTRACT:
Disclosed ia a keel for a sailing boat having a hydrofoil section. The thickness to chord ratio of the keel increases from the top to the bottom creating a vortex trap and thus reducing the drag of the keel. A generally horizontal plate at the bottom of the keel is also disclosed and further reduces the drag induced by vortex shedding. In one form the camber of the keel is adjustable. The mechanism for adjusting the camber includes rotatable forward and aft sections faired to a center section of the keel by sheets with a length being a small portion of the total cordal length of the keel. The fairing sheets are fixed along one vertical edge and tensioned by rods located within the rotating forward and aft sections of the keel. The lifting surface area of the keel can be altered, in response to wind velocities outside of the design range, by using a sealed sleeve arrangement with a water filled hollow internal portion and controlling the volume of water filling that portion thus controlling the position of the sleeve and lifting area of the keel.
REFERENCES:
patent: 3304898 (1967-02-01), Sainte-Claire
patent: 4089286 (1978-05-01), Scheel
patent: 4280433 (1981-07-01), Haddock
patent: 4316425 (1982-02-01), Guido
Simple Aerodynamics, 5th Ed., 1940, pp. 55, 64-65, Ronald Press Co., New York, N.Y.
Chambers's Technmical Dictionary, Revised Edition, 1940, pp. 34-35, The Macmillan Company, New York, N.Y.
Marchaj, Sailing Theory and Practice, 1964, pp. 66, 86, Dodd Mead & Co., New York, N.Y.
Peters Jr. Joseph F.
Swinehart Edwin L.
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