Hydrofoil sailboat

Claim 1

A HYDROFOIL, (A) THE OUTER SURFACE OF WHICH ENCLOSES A VOLUME WHICH DISPLACES A SUFFICIENT AMOUNT OF WATER, WHEN SUBMERGED AT REST THEREIN, TO SUPPORT A SUBSTANTIAL LOAD DISPOSED ABOVE THE WATER, (B) THE DISPLACEMENT BEING CONSIDERABLY IN EXCESS OF THAT OF A CONVENTIONAL HYDROFOIL CONSTRUCTED SOLELY TO PRODUCE MAXIMUM LIFT WITH MINIMUM DRAG AND ALSO HAVING GREATER DRAG THAN SAID CONVENTIONAL HYDROFOIL, (C) SAID HYDROFOIL HAVING A SUBSTANTIALLY FLAT SIDE AND A CAMBERED SIDE, (D) THEIR INTERSECTIONS FORMING LEADING AND TRAILING EDGES, (E) SAID CAMBERED SIDE BEING SYMMETRICAL ON EACH SIDE OF ITS CENTRAL SECTION, WHEREBY IT MAY PRODUCE EQUAL LIFT IN EITHER OF OPPOSITE DIRECTIONS OF MOVEMENT IN THE PLANE OF SAID FLAT SIDE, (F) MEANS FOR MOVING SAID HYDROFOIL THROUGH WATER WITH SAID FLAT SIDE DISPOSED AT AN ANGLE TO THE VERTICAL, SAID MEANS ADAPTED TO ALSO PRODUCE A FORCE EQUAL AND IN OPPOSITION TO THE HORIZONTAL COMPONENT OF FORCE PRODUCED BY SAID HYDROFOIL, (G) AND MEANS FOR ROTATING THE HYDROFOIL ABOUT A SUBSTANTIALLY VERTICAL AXIS FOR STEERING IT ALONG A DESIRED COURSE.