Abstract: A pressurized air cushioned hull with fixed rigid side, front and rear seals. The hull includes a plurality of keels, with an air cushion disposed between inboard walls of each keel and an air cushion created/disposed along the outboard walls of each keel. These air cushions along the outboard walls of the keels are created by angling each keel by about 0.02° to about 1° relative to the longitudinal axis of the hull, wherein the left keel(s) is rotated clockwise and the right keel(s) is rotated counterclockwise, such that a distance between the keels is smaller at the front end of the keels than at the rear end of the keels. This slight angle was found to allow air, rather than water, to contact the outboard walls, unexpectedly reducing drag resistance a significant amount, thus improving performance of the hull as a whole.

Abstract: A watercraft having an inboard motor and a transom aft of the motor includes an elongate propeller shaft. A propeller is mounted to a distal end of the propeller shaft and a universal joint is disposed in engaging relation to a proximal end of the propeller shaft. The universal joint includes a frame adapted to pivot about a horizontal axis and a vertical plate adapted to pivot about a vertical axis. A central aperture formed in the vertical plate receives the proximal end of the propeller shaft. Hydraulic cylinders control the respective instantaneous positions of the frame and the vertical plate. The universal joint and the hydraulic cylinders are disposed fore of the transom.

Abstract: A surface effect hull particularly suitable for use with a catamaran vessel. The twin hulls each comprise a V-shaped portion and a recess portion that receives pressurized gas therein. The V-shaped bow portion create dynamic lift and the pressurized air portion creates an air cushion for reduction of drag.

Abstract: An improved float construction of the type primarily intended for use in supporting a seaplane and commonly referred to as a pontoon. More particularly, the present invention relates to an improved bottom configuration of a single step float.