TRANSOM STERN HULL FORM AND APPENDAGES FOR IMPROVED HYDRODYNAMICS
First Claim
1. An apparatus, comprising:
- a transom stern displacement hull to operate at a speed-to-length ratio of from about 0.80 to about 3.00, the hull bisected along its length by a vertical centerplane, the hull including a hull underside along an aft portion of the hull, the hull underside having a deadrise angle along the hull underside of from approximately −
12 degrees to approximately 10 degrees, with the hull underside bounded on a right lateral side of the hull by a right hull side and on a left lateral side of the hull by a left hull side, the right and left hull sides each extending from the hull underside to a waterline;
a right endplate coupled to the hull proximal the right hull side; and
a left endplate coupled to the hull proximal the left hull side and generally opposite the right endplate, the right and left endplates each having a fixed height from approximately 0.2 percent of a displacement hull form beam measured adjacent the waterline to approximately 10 percent of the displacement hull beam measured adjacent the waterline,wherein the right and left endplates extend along a hull length from approximately the aft end of the hull toward a bow of the hull from about 1 to about 40 percent of hull waterline length, with the right and left endplates each generally aligned within approximately 20 degrees of the vertical plane.
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Abstract
An improved displacement hull form for ships and boats, in one of many possible embodiments includes a transom stern hull form (100F) having a hull underside (120A) that is substantially horizontal in transverse orientation along the aft-most portion of said hull form (100F), a pair of endplates (300D) having a substantially vertical orientation along the aft half of said hull form (100F) waterline length, a pair of cambered rudders (502J) located near the stern of said hull form (100F) with said cambered rudders (502J) having pressure faces oriented towards said hull form longitudinal centerplane (110A), and stern buttock-line shaping defined by a supercavitating hydrofoil (700M) shape. The hydrodynamics of said hull form (100F) are improved in terms of reduced resistance, reduced trim and draft aft, and reduced ship wave train. Other embodiments are described and shown.
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Citations
22 Claims
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1. An apparatus, comprising:
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a transom stern displacement hull to operate at a speed-to-length ratio of from about 0.80 to about 3.00, the hull bisected along its length by a vertical centerplane, the hull including a hull underside along an aft portion of the hull, the hull underside having a deadrise angle along the hull underside of from approximately −
12 degrees to approximately 10 degrees, with the hull underside bounded on a right lateral side of the hull by a right hull side and on a left lateral side of the hull by a left hull side, the right and left hull sides each extending from the hull underside to a waterline;a right endplate coupled to the hull proximal the right hull side; and a left endplate coupled to the hull proximal the left hull side and generally opposite the right endplate, the right and left endplates each having a fixed height from approximately 0.2 percent of a displacement hull form beam measured adjacent the waterline to approximately 10 percent of the displacement hull beam measured adjacent the waterline, wherein the right and left endplates extend along a hull length from approximately the aft end of the hull toward a bow of the hull from about 1 to about 40 percent of hull waterline length, with the right and left endplates each generally aligned within approximately 20 degrees of the vertical plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus, comprising
a transom stern displacement hull to operate at a speed-to-length ratio of from about 0.80 to about 3.00, the hull including a hull underside along an aft portion of the hull, the hull underside having a deadrise angle along the hull underside of from approximately − - 12 degrees to approximately 10 degrees, with the hull underside bounded on a right lateral side of the hull by a right hull side and on a left lateral side of the hull by a left hull side, the right and left hull sides each extending from the hull underside to a waterline; and
a pair of rudders coupled to the hull underside on opposite sides of a vertical centerplane that bisects the hull along its length, the rudders each having a span orientation that is substantially perpendicular to the underside, the rudders each having a chord orientation that is substantially parallel to the vertical centerplane of the hull, the rudders each having a cross-sectional shape along a plane substantially parallel to the plane defined by the waterline, the shape defining a streamlined cambered hydrofoil, with respective pressure sides of the rudders each facing the vertical plane, the rudders to produce lift coefficients of between 0.01 and 1.0, with each of the rudders having a respective rudder quarter chord line located a distance from the aft end of the hull, the distance being between 0 and approximately 25 percent of the hull waterline length. - View Dependent Claims (10, 11, 12, 13, 14, 21)
- 12 degrees to approximately 10 degrees, with the hull underside bounded on a right lateral side of the hull by a right hull side and on a left lateral side of the hull by a left hull side, the right and left hull sides each extending from the hull underside to a waterline; and
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15. An apparatus, comprising:
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a transom stern displacement hull to operate at a speed-to-length ratio of from about 0.80 to about 3.00, the hull including a hull underside along an aft portion of the hull, the hull underside having a deadrise angle along the hull underside of from approximately −
12 degrees to approximately 10 degrees, with the hull underside bounded on a right lateral side of the hull by a right hull side and on a left lateral side of the hull by a left hull side, the right and left hull sides each extending from the hull underside to a waterline,wherein the hull underside defines a cambered surface that includes a supercavitating hydrofoil, the cambered surface having a two-dimensional section design lift coefficient of between 0.01 and 0.12, with a longitudinal extent spanning from the aft portion of the hull toward a bow from about 10 to about 50 percent of the waterline length of the hull, said cambered surface having a transverse extent spanning the underside. - View Dependent Claims (16, 17, 18, 19, 20, 22)
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Specification