Patent ID: 6131529
Filing Date: 2000-10-17
Classification: B63B

Abstract:
A method for displacement hull design of a water vessel having a hull, wherein the hull has a hull shape, a wetted length, a beam, a wetted surface area, a residuary resistance, a prismatic coefficient, a block coefficient, a maximum beam coefficient, and a water plane coefficient, comprising: constraining the hull such that the hull has slenderness, wherein the hull slenderness comprises the hull having a high ratio of the wetted length to the beam, and the residuary resistance is minimized;constraining the hull shape such that the hull has the minimum wetted surface area for the hull slenderness; andoptimizing the hull shape wherein optimizing the hull shape includes varying the prismatic coefficient, the block coefficient, the maximum beam coefficient, and the water plane coefficient;wherein the hull has substantially an ellipsoidal shape;wherein the ellipsoidal shape is a longitudinally non-symmetrical shape;wherein the hull has a fore, an aft, a center of buoyancy, a length of entry, and an overall length, and wherein the longitudinally non-symmetrical ellipsoidal hull shape has a plurality of design characteristics, the plurality of design characteristics including the longitudinal center located in the aft, and a ratio of the length of entry to the overall length is greater than 0.5;wherein the hull comprises an entry angle, and wherein the plurality of design characteristics includes refined entry angle and a transom stern;wherein the hull is substantially a prolate spheroidal shape, and wherein the water vessel comprises a multihull, such that the multihull provides lateral stability;wherein the water vessel has a waterline, and wherein the water vessel is a trimaran comprising a main center hull and two outrigger hulls, the two outrigger hulls being equally spaced on opposite sides of the main center hull the two outrigger hulls being connected to the main center hull above the waterline; andwherein the two outrigger hulls each have an angular orientation and a vertical orientation relative to the main center hull, and wherein the outrigger hulls are connected to the center hull such that the angular orientation and the vertical orientation of each of the two outrigger hulls is adjustable relative to the main center hull.