초록 ▼

The present invention is an improved boat hull construction, in particular for power catamarans. The individual hulls incorporate step breaks to define individual planing sections with different constant deadrise angles. Twist or warp is thereby eliminated in these sections, reducing drag and increa

The present invention is an improved boat hull construction, in particular for power catamarans. The individual hulls incorporate step breaks to define individual planing sections with different constant deadrise angles. Twist or warp is thereby eliminated in these sections, reducing drag and increasing efficiency. The step breaks also allow individual outboard chine flats which reduce in width from aft to fore. The catamaran tunnel features a decreasing section to compress air and provide a cushioned ride.

대표청구항 ▼

A boat having two spaced-apart hulls, a boat body positioned on the hulls and a tunnel formed on three sides by such body and hulls and on a fourth and a bottom side by the water in which the boat is positioned, said tunnel defining a mouth at the bow of the boat and an exit at the stern; wherein: t

A boat having two spaced-apart hulls, a boat body positioned on the hulls and a tunnel formed on three sides by such body and hulls and on a fourth and a bottom side by the water in which the boat is positioned, said tunnel defining a mouth at the bow of the boat and an exit at the stern; wherein: the distance between the spaced apart hulls defines a tunnel width which decreases from the mouth to the exit; the boat body defines a tunnel roof at a decreasing height above the waterline from the mouth to the exit; each said hull comprises an aft planing section, a mid planing section and a fore planing section disposed one adjacent to the next from aft to forward along the hull, a first step break disposed between the aft and mid planing sections and a second step break disposed between the mid and fore planing sections; the aft section defines first a constant deadrise angle and the mid section defines a second constant deadrise angle greater than the first constant deadrise angle such that the deadrise angle of said hull increases from aft through the mid sections without twist or warp; and the fore section defines at least a third deadrise angle greater than the first and second deadrise angles.