Abstract: A shell made up of opposed halves is fitted over the propeller screw of the motor on the boat. This shell then becomes an enclosure with inlet and outlet openings at the ends. This shell with the propeller screw forms a pump with the propeller screw pumping water through the shell and through an outlet hose which is extended to the shore. One form has the inlet and outlet openings on the axis of the propeller screw and other forms include the outlet arranged tangentially or angularly. A hose can be connected to the inlet opening for bailing a boat.

Abstract: Propulsion means of undersea vehicle comprises a pair of counter-rotating w speed impellers driven from a spider shaft rotating at relatively high speed. The reduction is accomplished by a variable speed reducing and torque transmitting device which allows infinite resolution for speed control including a zero speed setting while maintaining a constant high speed at the input spider shaft. Attitude of the vehicle is controlled by a plurality of regulated inlet ports and roll control is regulated by increasing the speed of one impeller and decreasing the speed of the other. The sea water utilized for the attitude is also used for propulsion. Control systems within the vehicle utilize and electro-pneumatic-hydraulic system complex.