Hydrofoil apparatus

Claim 1

AN APPARATUS FOR PRODUCING LIFT BY MOTION IN A LIQUID MEDIUM COMPRISING A DELTA SHAPED BODY MEMBER HAVING A LONGITUDINAL AXIS AND AN UPPER AND LOWER SURFACE WHICH CONVERGE AT AN ACUTE ANGLE ALONG THE FORWARD EXTENT OF THE BODY MEMBER TO FORM A PAIR OF THIN LEADING EDGES DISPOSED SYMMETRICALLY WITH RESPECT TO THE LONGITUDINAL AXIS OF THE BODY MEMBER SO THAT THE PROJECTION OF THE LEADING EDGES ONTO A PLANE PERPENDICULAR TO THE LONGITUDINAL AXIS IS SYMMETRICAL WITH RESPECT TO THE LONGITUDINAL AXIS, THE BODY MEMBER BEING CONSTRUCTED SO THAT THE DISTANCE BETWEEN THE UPPER AND LOWER SURFACES INCREASES ALONG SUBSTANTIALLY EACH LONGITUDINAL CROSS-SECTION FROM THE LEADING EDGES TO THE REAR OF THE BODY MEMBER TO INCREASE THE IMPULSE LIFT ON THE LOWER SURFACE AND REDUCE THE DRAG FORCES ON THE UPPER SURFACE, THE ACUTE ANGLE AT WHICH THE BODY MEMBER UPPER AND LOWER SURFACES CONVERGE ALONG THE LEADING EDGES PROVIDING HIGH LIFT TO DRAG RATIO FOR THE BODY MEMBER.