Watercraft hull with improved lift, planing speed range, and near maximum efficiency

摘要

A hull for a planing type watercraft has a front lift surface, a high lift surface, and a back planing surface. The high lift surface is adjacent a rockered keel area and between the front lift surface and the back planing surface. The center of dynamic lift on the high lift surface is at or in front of a point which is 15% of the hull length behind a total center of gravity of the hull under loading. At least the back one third of the high lift surface is cambered, and a beam of the high lift surface is greater than two thirds of the maximum width of the hull. The average camber of the front lift surface, the high lift surface, and the back planing surface together is less than or equal to zero.

主权项

1. A hull for a watercraft having a length and a maximum width, comprising:
a rockered keel area; a front lift surface; a back planing surface, wherein at least one portion of either or both said front lift surface and said back planing surface has positive camber in a longitudinal direction; and a main lift surface adjacent said rockered keel area and between said front lift surface and said back planing surface with a longitudinal position such that a center of dynamic lift of said main lift surface is at or in front of a point which is a fraction of said length of said hull behind a total center of gravity of said hull, wherein
at least a back portion of said main lift surface has positive camber in the longitudinal direction, anda beam at said main lift surface is greater than two thirds said maximum width, wherein said front lift surface and said main lift surface are separated by a step in one or more of hull depth and attack angle, wherein said back planing surface is longitudinally separated from at least a portion of said main lift surface ending in a step in one or more of hull depth and attack angle, wherein the front lift surface supports less than 50% of the hull's total planing lift, and wherein a line running along the hull surface along the hull centerline from the front of said front lift surface to the middle of said main lift surface to the back of the back planing surface will have rocker or zero camber.