Claims
- 1. A high speed ship comprising a hull structure having a bow portion and a stern portion and being normally supported above the surface of the water at a design waterline when in operation, a forward strut depending from the bow portion of the hull structure subtended by a first buoyancy means, a pair of aft dual struts depending from the hull structure at approximately midship, said aft struts being subtended by a second buoyancy means whose beam is equal to or greater than its length extending laterally all the way between said struts; said aft struts and said second buoyancy means providing more than 70% of the buoyancy for the ship during operation to maintain said hull structure above the surface of the water during operation and said forward strut and first buoyancy means providing 30% or less of the buoyancy of the vessel during operation; and wherein the center of buoyancy of the ship is located within the periphery of the second buoyancy means when viewed from above.
- 2. A high speed ship as defined in claim 1 wherein said forward buoyancy means comprises a foil shaped member.
- 3. A high speed ship as defined in claim 2 wherein said foil shaped member is generally deltoid shaped in plan form.
- 4. A high speed ship as defined in claim 2 wherein said foil shaped member is positioned to be deeper in the water than said second buoyancy means.
- 5. A high speed ship as defined in claim 1 wherein said forward buoyancy means includes movable ship control surfaces.
- 6. A high speed ship as defined in claim 1 wherein said forward strut has increasing waterplane area sections above the design waterline of the ship.
- 7. A high speed ship as defined in claim 1 wherein said forward buoyancy means has a width that is less than the transverse spacing between said aft pair of struts.
- 8. A high speed ship as defined in claim 1 wherein said first buoyancy means is a generally cylindrical hull member.
- 9. A high speed ship as defined in claim 8 including foil shaped stabilizers extending laterally from said first buoyancy means.
- 10. A high speed ship as defined in claim 1 wherein said pair of aft struts are positioned at dihedral angles to said hull structure.
- 11. A high speed ship as defined in claim 1 wherein said second buoyancy means comprises a pair of generally cylindrical pods subtended respectively from said aft dual struts and a displacement foil extending there between, said pods and foil providing more than 70% of the buoyancy for said ship.
- 12. A high speed ship as defined in claim 11 wherein said foil has a height dimension less than that of said pods.
- 13. A high speed ship as defined in claim 1 wherein said second buoyancy means comprises a displacement foil connected to said struts, said foil providing more than 70% of the buoyancy of said ship.
- 14. A high speed ship as defined in claim 7 including propulsion means in said second buoyancy means including propellers located on the forward end of the second buoyancy means outboard of said first buoyancy means.
- 15. A high speed ship as defined in claim 1 including a pair of elongated sponsons depending from said hull to a position adjacent the design waterline of the ship for providing hydrostatic transverse and longitudinal stability to the ship when said design waterline is submerged.
- 16. A high speed ship as defined in claim 15 wherein said sponsons are outboard of said pair of struts.
- 17. A high speed ship as defined in claim 1 including at least one forward and one aft flotation strut depending from said hull structure to a point above the design waterline of the ship when in operation.
- 18. A high speed ship comprising a superstructure normally located above the level of the water during operation of the ship, a forward strut depending from said superstructure to a position below the design waterline of the ship; a pair of struts depending from said superstructure aft of the forward strut to a position below the design waterline of the ship; forward normally submerged buoyancy means for providing buoyancy to the ship connected to said forward strut below the design waterline of the ship; and aft buoyancy means connected to said pair of struts below the design waterline of the ship for providing more than 70% of the ship's buoyancy, said buoyancy means both being submerged when the ship is at rest and when it is underway; said second buoyancy means comprising a displacement foil connected to said struts, said displacement foil providing more than 70% of the buoyancy of said ship.
- 19. A high speed ship as defined in claim 18 wherein said forward buoyancy means comprises a foil shaped member.
- 20. A high speed ship as defined in claim 19 wherein said foil shaped member is generally deltoid shaped in plan form.
- 21. A high speed ship as defined in claim 19 wherein said forward strut has increasing waterplane area sections above the design waterline of the ship.
- 22. A high speed ship as defined in claim 18 wherein said foil shaped member is positioned to be deeper in the water than said second buoyancy means.
- 23. A high speed ship as defined in claim 18 wherein said pair of aft struts are positioned at dihedral angles to said hull.
- 24. A high speed ship as defined in claim 18 wherein said second buoyancy means comprises a pair of generally cylindrical pods subtended respectively from said aft dual struts and a displacement foil extending therebetween, said pods and foil providing more than 70% of the buoyancy for said ship.
- 25. A high speed ship as defined in claim 18 including propulsion means in said second buoyancy means including propellers located on the forward end of the second buoyancy means outboard of said first buoyancy means.
- 26. A high speed ship as defined in claim 25 including a pair of elongated sponsons depending from said hull to a position adjacent the design waterline of the ship for providing hydrostatic transverse longitudinal stability to the ship.
- 27. A high speed ship as defined in claim 26 wherein said sponsons have waterplane areas which increase above the design waterline of the ship.
- 28. A high speed ship as defined in claim 27 wherein said struts and buoyancy means have a length dimensions from bow to stern determined by the formula ##EQU2## where F=design Froude number
- V=design speed of the small waterplane area high speed ship in feet per second
- l=longitudinal length of the struts in feet
- g=acceleration due to of gravity in feet per second squared
- and the design Froude number is 0.8 or greater, said second buoyancy means providing more than 70% of the buoyancy for the ship during operation to maintain said hull above the surface of the water in a generally level attitude with the first buoyancy means providing less than 30% of the buoyancy for the ship.
- 29. A high speed ship as defined in claim 18 including at least one forward and one aft flotation strut depending from said hull structure to a point adjacent the design waterline of the ship when in operation.
Parent Case Info
This application is a continuation-in-part of U.S. patent application Ser. No. 159,596, filed Dec. 1, 1993, now U.S. Pat. No. 5,433,161, Jul. 18, 1995.
US Referenced Citations (3)
Foreign Referenced Citations (8)
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0002986 |
Jan 1977 |
JPX |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
159596 |
Dec 1993 |
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