Abstract: A planing boat's primary hull has an adjunct hull surface rotatably connected thereto near its forward end. The adjunct hull surface extends along the hull of the planing boat to aft of amidships and is constructed of a rigid material that conforms to the shape of the hull of the planing boat. A position controller is coupled to the adjunct hull surface to selectively position the adjunct hull surface relative to the hull of the planing boat. When the adjunct hull surface is spaced apart from the hull of the planing boat, the position controller also absorbs shock loads experienced by the adjunct hull surface.

Abstract: A submersible boat is provided which utilizes a planing boat hull with a sharp bow and blunt stern. The submersible boat performs as a planing boat until it nears the target location. Then, the boat submerges in order to avoid detection. After this vessel submerges, it travels with the blunt end forward and the sharp end aft.

Abstract: This invention pertains to a rotary disk tool which utilizes pressurized water as the working fluid. When an operator engages a trigger on a novel control handle and valve assembly, pressurized seawater enters the rotary disk tool through the control handle and valve assembly into a seawater powered vane motor. The shaft of the seawater powered vane motor, is coupled to a drive gear. The drive gear, in turn, is in operative engagement with a driven pinion coupled to an output shaft which drives an abrasive disk. Seawater exhausted from the motor into a gear and pinion housing provides lubrication for the drive gear, driven pinion, and the bearings used with the gear and pinion. The seawater is then exhausted from the housing as a fan spray directed onto the back of the abrasive disk so as to reduce drag of the disk in water and to flush away loose material from the work surface.

Abstract: A submersible boat is provided which utilizes a planing boat hull with a sharp bow and blunt stern. The submersible boat performs as a planing boat until it nears the target location. Then, the boat submerges in order to avoid detection. After this vessel submerges, it travels with the blunt end forward and the sharp end aft.