Planing hull for rough seas

摘要

The disclosed watercraft hull has a flat pad keel whose width tapers towards the bow and its width at the transom is 15% to 25% of the hull's width at its chines. The hull is symmetric about its centerline, has a fine entry bow, a transom, and a pair of hard chines. Between the pad keel and the chines the hull has at least one pair of generally flat panels referred to herein as longitudinal steps having approximately 0 degrees of deadrize forming planing surfaces symmetrically located about the hull centerline. The hull also includes at least one pair of ultra high deadrize panels, outboard of and adjacent to the pad keel, located symmetrically about the hull centerline, and extending therefrom to the flat planing panels above them. The ultra high deadrize panels have a minimum average deadrize of approximately 50 degrees measured along their length. Additional flat planing surface structures having approximately 0° deadrize may be installed longitudinally on the hull between the pad keel and the hard chine such that the vertical offset between any two planing surfaces along the hull's stagnation line does not exceed approximately six inches. High deadrize panels or fillet panels with deadrize angles of between about 0.20 and 35 degrees may be included in the hull outboard of and adjacent to the ultra high deadrize panels and located symmetrically about the hull centerline. The fillet panels are tapered into wedge shapes at their forward ends to blend into the adjacent ultra high deadrize and flat planing panels.

主权项

1. A watercraft including a hull comprising:
a bow; a transom; a pair of chines symmetrically arranged on the hull and defining a width of the hull; a flat pad keel having a width at the transom that is 15% to 25% of the hull width at outer hull chines as measured at the transom; a pair of hull panels each having a deadrise angle of 50 degrees or more extending outwardly upwardly, and symmetrically and disposed about a hull centerline and connecting the flat pad keel to a first pair of longitudinal steps forming planing surfaces; and one or more additional pairs of hull panels forming longitudinal steps symmetrically disposed about the hull centerline and disposed between additional pairs of planing surfaces or strakes, which one or more additional pairs of hull panels connect the first and lowermost pair of planing surfaces or strakes to one or more additional pairs of planing surfaces or strakes, and, of the one or more additional pairs of hull panels, a most outboard pair of hull panels connect (i) to the hull chines, (ii) to a most outboard pair of planing surfaces, (iii) to entrapment tunnels, or (iv) to amas, symmetrically disposed about the hull centerline; wherein the planing surfaces have a combined width of 14 to 20% of the hull at width outer hull chines as measured at the transom, and all hull panels have a deadrise of 50 degrees or more; and wherein at least one pair of the longitudinal steps curve upward in the bow to conform to curvature of the bow.