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US 3,981,258 AGranted
Waterski sailboat
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorBernard Smith
Life of this patent
Estimating the term…
Abstract
A hydrofoil sailboat with a slender hull and a foil-shaped sail spaced laally therefrom. The hull has one flat side facing the sail and one convex side. The sail is inclined from the vertical toward the hull and is supported at its base ends by a pair of freely swiveling waterskis. The hull supports a rudder at each of its ends, the rudders being hydrofoils with their flat sides facing the sail. The length-to-width ratio of the hull is no less than 5:1 and the inclination of the sail about 30.degree. from the vertical.
Claims11
A hydrofoil sailboat comprising:
- a slender hull one side of which is flat and the other side convexly curved to provide a hydrofoil shape to raise the sailboat at high speeds thereby reducing immersion and resistance;
- at least one rudder on one end of said hull and means to control the angular movement of said rudder, said rudder being shaped with one flat side and one convexly curved side;
- a sail, having the characteristics of an airfoil, spaced laterally from the flat side of said hull whereby said hull will resist side forces generated by said sail;
- means for movably attaching said sail to said hull at an angle from the vertical so that the sail tilts toward the hull, the tilt of the sail being variable and the sail being movable in azimuth at least on one side of the hull;
- and
- waterski means attached at the bottom of the sail and supporting the sail.
3 more elements
Dependencies are inferred from the claim text.