A hydrofoil craft, particularly a method of economically modifying a conventional hull with cambered foils to obtain and calculate increased lift from dense spray and to achieve enhanced craft performance is disclosed. The present invention improves speed, fuel efficiency and rough water stability,
A hydrofoil craft, particularly a method of economically modifying a conventional hull with cambered foils to obtain and calculate increased lift from dense spray and to achieve enhanced craft performance is disclosed. The present invention improves speed, fuel efficiency and rough water stability, reduced pitch and vertical accelerations. A catamaran or V-bottom hull (20) is modified with chine mounted aerofoils (32, 33, 28, 28A), flexible dihedral cambered foils positioned beneath the water line and on either side of the bow (30, 31) so as to create turbulence in the forward end of a tunnel(s) (26). Fixed forward tunnel cambered foil(s) (28) and/or fixed or adjustable center tunnel cambered foils at the stern (28A) end of the tunnel (26) to generate lift from pressure caused by dense spray in the tunnel(s) (26) may also be provided.
대표청구항▼
1. A boat hull comprising:a bow and a stern; a waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible cambered bow foils, said flexible cambered bow fo
1. A boat hull comprising:a bow and a stern; a waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible cambered bow foils, said flexible cambered bow foils supported on sides of said bow beneath the water line, said flexible cambered foils being capable of controlling a flow within said at least one tunnel and creating a dense spray in an end of said tunnel while cushioning shock and lifting said bow; and a first adjustable cambered tunnel foil being adjustably positioned within said tunnel and generating lift from a pressure being generated by the dense spray within said tunnel. 2. The boat hull according to claim 1, further comprising a second cambered tunnel foil at either the aft end or at the forward end of said tunnel generating lift from a pressure being generated by the dense spray within said tunnel.3. The boat hull according to claim 1, said boat hull further comprising a v-bottom or rigid inflatable hull.4. The boat hull according to claim 1, said boat hull further comprising a catamaran hull.5. The boat hull according to claim 1, wherein at least one of said foils includes a foil assembly, said foil assembly includinga main cantilevered, flexible cambered metal foil, a rubber shock pad, reinforcing material, a bolt plate, and a bolt and lock nut assembly. 6. A boat hull comprising:a bow and a stern; a waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible cambered bow foils, said flexible cambered bow foils supported on sides of said bow beneath the water line, said flexible cambered foils being capable of controlling a flow within said at least one tunnel and creating a dense spray in an end of said tunnel while cushioning shock and lifting said bow; a first cambered tunnel foil being positioned within said tunnel and generating lift from a pressure being generated by the dense spray within said tunnel; and a rigid cambered stern foil forming a skirt extending substantially across the tunnel and peripherally enclosing a transom of said stern, said stern foil being capable of preventing air from escaping, compressing said dense spray and thereby lifting said stern. 7. The boat hull according to claim 6, wherein said first cambered tunnel foil is a center tunnel cambered foil between said forward end and said center region of said tunnel and is fixed or variable in height, and said stern cambered stern foil is variable in height and or in trim so as to control the lift of said hull.8. A boat hull comprising:a bow and a stern, said stern including a transom; a waterline extending between said bow and said stern; a pair of tunnels extending axially in a direction from said bow toward said stern, wherein each of said tunnels includes a forward end, a center region and an aft end; a pair of flexible cambered bow foils, said flexible cambered bow foils supported on sides of said bow beneath the water line, said flexible cambered bow foils being capable of controlling a flow within said tunnels and creating a dense spray in an end of said tunnel while cushioning shock and lifting said bow; and a pair of cambered tunnel foils being positioned within said tunnels, respectively, wherein each of said tunnels includes a respective tunnel foil generating lift from a pressure being generated by the dense spray within said respective tunnel. 9. The boat hull according to claim 8, wherein said tunnel foils are positioned at said forward ends of said tunnels.10. The boat hull according to claim 9, further comprising a pair of cambered stern foils forming a skirt extending substantially across said tunnels so as to peripherally enclose said transom and prevent air from escaping, compressing said dense spray and lifting thereby said stern.11. The boat hull according to claim 8, wherein said tunnel foils are positioned at said center regions of said tunnels.12. The boat hull according to claim 11, further comprising a pair of cambered stern foils forming a skirt extending substantially across said tunnels so as to peripherally enclose said transom and prevent air from escaping, compressing said dense spray and lifting thereby said stern.13. The boat hull according to claim 8, further comprising a pair of cambered stern foils forming a skirt extending substantially across said tunnels so as to peripherally enclose said transom and prevent air from escaping, compressing said dense spray and lifting thereby said stern.14. The boat hull according to claim 8, said boat hull further comprising a v-bottom or rigid inflatable hull.15. The boat hull according to claim 8, said boat hull further comprising a catamaran hull.16. A method for obtaining enhanced lift, performance and rough water stability with cambered tunnel and bow foils, said method comprising the steps of:(a) defining a boat height above a waterline, a wetted surface area, a trim angle, a hull weight and a horse power vs. speed requirement; (b) defining dimensions of the cambered foils and hull, said dimensions including length, beam, camber, trim, floor rise and weight; (c) defining foil lift and drag based on said cambered foil dimensions, trim, spray density, speed, height above waterline, wetted surface area, coefficient of friction and sea trial data from prototype cambered foils; (d) modifying a hull with a hull modification to incorporate said cambered foils, wherein said modified hull includes a bow and a stern; the waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible cambered bow foils, said flexible cambered bow foils supported on sides of said bow beneath the water line, said flexible cambered bow foils being capable of controlling a flow within said tunnel and creating a dense spray in an end of said tunnel while cushioning shock and lifting said bow; and a first adjustable cambered tunnel foil being positioned within said at least one tunnel and generating lift from a pressure being generated by the dense spray within said at least one tunnel; and (e) defining hull lift and drag aft the hull modification based on water pressure, beam, length, trim, velocity, gravity, coefficient of friction, floor rise, wetted surface, residual hull resistance, appendage and wind resistance. 17. The method according to claim 16, further comprising:(f) defining the speed vs. horsepower before and after said hull modification with cambered foils; and (g) calculating enhanced performance. 18. A boat hull comprising:a bow and a stern; a waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible cambered bow foils, said flexible cambered bow foils supported on sides of said bow beneath the water line, said flexible cambered foils being capable of controlling a flow within said at least one tunnel and creating a dense spray in an end of said tunnel while cushioning shock and lifting said bow; a first cambered tunnel foil being positioned within said tunnel and generating lift from a pressure being generated by the dense spray within said tunnel; a second cambered tunnel foil at either the aft end or at the forward end of said tunnel generating lift from a pressure being generated by the dense spray within said tunnel; and a rigid cambered stern foil forming a skirt extending substantially across the tunnel and peripherally enclosing a transom of said stern, said stern foil being capable of preventing air from escaping, compressing said dense spray and thereby lifting said stern. 19. The boat hull according to claim 18, wherein said first cambered tunnel foil is a center tunnel cambered foil between said forward end and said center region and is fixed or variable in height, and said stern cambered stern foil is variable in height and or in trim so as to control the lift of said hull.20. A catamaran boat hull comprising:a bow and a stern; a waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible bow cambered foils supported on sides of said bow beneath the water line, said flexible bow cambered foils being capable of controlling a flow within said at least one tunnel and creating a dense spray in said tunnel while cushioning shock and lifting said bow; and a first adjustable tunnel cambered foil being adjustably positioned within said tunnel and generating lift from a pressure being generated by the dense spray within said tunnel. 21. The catamaran boat hull according to claim 20, further comprising a second tunnel cambered foil at either the aft end or at the forward end of said tunnel generating lift from a pressure being generated by the dense spray within said tunnel.22. The boat hull according to claim 20, wherein at least one of said cambered foils includes a foil assembly, said foil assembly includinga main cantilevered, flexible cambered metal plane, a rubber shock pad, reinforcing material, a bolt plate, and a bolt and lock nut assembly. 23. A catamaran boat hull comprising:a bow and a stern; a waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible bow cambered foils supported on sides of said bow beneath the water line, said flexible bow cambered foils being capable of controlling a flow within said at least one tunnel and creating a dense spray in said tunnel while cushioning shock and lifting said bow; a first tunnel cambered foil being positioned within said tunnel and generating lift from a pressure being generated by the dense spray within said tunnel; and a rigid stern cambered foil extending substantially across the tunnel and a stern skirt peripherally enclosing a transom of said stern, said stern cambered foil and stern skirt being capable of preventing air from escaping, compressing said dense spray, and thereby lifting said stern. 24. The catamaran boat hull according to claim 23, wherein said first tunnel cambered foil is a center tunnel cambered foil between said forward end and said center region of said tunnel and is fixed or variable in height, and said stern cambered stern foil is variable in height and or in trim so as to control the lift of said hull.25. A boat hull comprising:a bow and a stern, said stern including a transom; a waterline extending between said bow and said stern, wherein said boat hull is a V bottom or a rigid inflatable hull; a pair of tunnels, wherein said tunnels are enclosed fore and aft by a chine aerofoil hull skirt extending along sides of said hull from a point of attachment of said hull skirt to the transom, and said tunnels extend axially in a direction from said bow toward said stern; a pair of flexible bow cambered foils supported on sides of said bow beneath the water line, said flexible bow cambered foils being capable of controlling a flow within said tunnels and creating a dense spray in said tunnels while cushioning shock and lifting said bow; and a pair of tunnel cambered foils, said tunnel cambered foils generating lift from a pressure being generated by the dense spray and water within said respective tunnels. 26. The boat hull according to claim 25, wherein said pair of tunnel cambered foils are attached to the hull.27. The boat hull according to claim 26, wherein said pair of tunnel cambered foils are attached to the chine aerofoil hull skirt.28. The boat hull according to claim 26, further comprising a pair of stern cambered foils extending substantially across said tunnels and a stern skirt so as to peripherally enclose said transom and prevent air from escaping, for compressing said dense spray and water, and thereby lifting said stern.29. The boat hull according to claim 28, wherein said pair of stern cambered foils are attached to a variable stern foil.30. The boat hull according to claim 25, wherein said pair of tunnel cambered foils are attached to the chine aerofoil hull skirt.31. The boat hull according to claim 25, further comprising a rigid stern cambered foil extending substantially across the tunnel and a stern skirt peripherally enclosing a transom of said stern, said stern cambered foil and stern skirt being capable of preventing air from escaping, compressing said dense spray, and thereby lifting said stern.32. The boat hull according to claim 31, further comprising a pair of stern cambered foils extending substantially across said tunnels and a skirt so as to peripherally enclose said transom and prevent air from escaping, for compressing said dense spray and water, and thereby lifting said stern.33. The boat hull according to claim 25, wherein at least one of said cambered foils includes a foil assembly, said foil assembly includinga main cantilevered, flexible cambered metal plane, a rubber shock pad, reinforcing material, a bolt plate, and a bolt and lock nut assembly. 34. A method for obtaining enhanced lift, performance and rough water stability with cambered tunnel and bow foils, said method comprising the steps of:(a) defining a boat height above a waterline, a wetted surface area, a trim angle, a hull weight and a horse power vs. speed requirement; (b) defining dimensions of the cambered foils and hull, said dimensions including length, beam, camber, trim, floor rise and weight; (c) defining foil lift and drag based on said cambered foil dimensions, trim, spray density, speed, height above waterline, wetted surface area, coefficient of friction and sea trial data from prototype cambered foils; (d) modifying a hull with a hull modification to incorporate said cambered foils, wherein said modified hull includes a bow and a stern; the waterline extending between said bow and said stern; a tunnel extending axially in a direction from said bow toward said stern and having a forward end, a center region and an aft end; a pair of flexible cambered bow foils, said flexible cambered bow foils supported on sides of said bow beneath the water line, said flexible cambered bow foils being capable of controlling a flow within said tunnel and creating a dense spray in an end of said tunnel while cushioning shock and lifting said bow; a first cambered tunnel foil being positioned within said at least one tunnel and generating lift from a pressure being generated by the dense spray within said at least one tunnel, and a rigid cambered stern foil forming a skirt extending substantially across the tunnel and peripherally enclosing a transom of said stern, said stern foil being capable of preventing air from escaping, compressing said dense spray and thereby lifting said stern; and (e) defining hull lift and drag aft the hull modification based on water pressure, beam, length, trim, velocity, gravity, coefficient of friction, floor rise, wetted surface, residual hull resistance, appendage and wind resistance.
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이 특허에 인용된 특허 (15)
Barbazash Vladimiz (St. Petersburg RUX) Kruglov Albert D. (St. Petersburg RUX) Rapoport Boris E. (St. Petersburg RUX) Ukrainskiy Yury M. (Moscow RUX), Catamaran.
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