Navatek, Ltd.

Hull Scientific Research LLC

Scott Yamashita

Steven Loui

Gary Shimozono

Mealani Parish

Steven C H Loui

Troy Keipper

Christopher Hart

Emile Suehiro

Eric Schiff

Jeff Kline

Steven Ch Loui

A watercraft system is provided. The watercraft system includes a lifting body designed to generate dynamic lift during watercraft operation. The lifting body is shaped with a twist from the center to the lateral edges and with a chord and a fore-aft cross-section that both decrease from a center of the lifting body to lateral tips of the lifting body.

Watercraft with lifting bodies

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&#xb0; 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.

Planing hull for rough seas

An inflatable watercraft is provided with multiple reinforced panels that are configured to form a center hull having a V-form. The center hull supports a floor that is coupled to a U-form collar. The panels also form a pair of outer side hulls respectively disposed on opposite sides of the center hull and which define a tunnel between the center hull and each of the outer side hulls.

Inflatable watercraft with reinforced panels

A boat hull has an aft swept ventilated area in at least a part of its bottom planing surface. An aft swept water flow interrupter is positioned to project downwardly from the hull forward of the ventilated area. The aft swept flow interrupter has two generally angularly related legs or sections defining a 30&#xb0; to 70&#xb0; included angle, increase lift on the hull, reduces wetted surface area and improves the turning characteristics of the hull.

Ventilated aft swept flow interrupter hull

A boat hull has at least one generally transverse ventilation step formed in at least a part of its bottom planing surface open to the water. The step has a forward edge portion and a water flow interrupter is positioned to project downwardly from the hull forward of the forward edge of the step.

Ventilated flow interrupter stepped hull

A boat hull has at least one rocker chute formed therein open to the water forward of the hull's transom. The chute has a leading edge forward of the transom and an interceptor plate projects downwardly from the hull at said leading edge.

Hull with improved trim control

A watercraft hull having a pair of laterally spaced propulsion tunnels located on opposite sides of its keel, with said tunnels being open downwardly towards the water, includes a movably mounted keel section located between said propulsion tunnels to prevent water crossflow between said tunnels and increase dynamic lift on the hull.

Watercraft hull with adjustable keel

A watercraft hull has at least one bent entrapment tunnel with an aft portion whose tunnel ceiling is at a higher elevation than portions of the tunnel ceiling immediately in front of it to provide a negative angle of attack with the free surface at design planing speeds.

Watercraft hull with entrapment tunnel

A boat hull has at least one ventilating propulsion tunnel formed therein open to the water forward of the hull's transom and adapted to contain a propeller of the propulsion system. The tunnel has a leading edge forward of the transom and an interceptor plate projects downwardly from the hull at the leading edge.

Hull with propulsion tunnel and leading edge interceptor

A watercraft having a hull, a fore and aft longitudinal axis and a bow includes a three dimensional low drag submerged lifting body secured to the bow below the design waterline of the hull.

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Honolulu, HI, United States of America

Scott Yamashita