Abstract: An improved boat thruster system including a pump for drawing water through an inlet in the boat hull and for discharging water through outlets on both sides of the hull. The improved system includes a plurality of substantially planar vanes mounted in the water flow path proximate to said outlets. The vanes function to reduce swirl angle components in the water flow and thus increase thrust efficiency and to prevent the ingestion of water borne debris into the outlets.

Abstract: The use of thrusters at the bow and stern of an airship for control of the direction, attitude, and orientation of such an airship is described. The thruster utilizes an electric motor or a gas turbine for power. In the electric motor embodiment, the motor utilizes two contra-rotating rotors which each drive a separate and contra-rotating propeller to generate the controlling jet of air. Thrusters are arranged in pairs at the top, bottom, and each side of the bow and stern of the airship. Lifting thrusters directed downwardly and located above the longitudinal extent of the hull are provided to augment the static lift capability of the airship when under heavy load.

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.

Abstract: Propulsion apparatus for an undersea vehicle comprises a pair of counter-ating low 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 an electro-pneumatic-hydraulic system complex.

Abstract: The invention provides a propeller with a water-jet for crafts consisting of an outboard motor capable of being swivelled at any angle and carrying structure for fixing it at the rear of a craft, a propeller wherein there is a propulsion unit rigidly secured to said outboard motor, the rotor and water-inlet and water-outlet of which are positioned along one and the same axis and perpendicular to the output axis of the outboard motor, the water-inlet and water-outlet of the propulsion unit carrying water-inlet and outlet nozzles whose slewing makes angles substantially identical to one another in relation to the axis of the propulsion unit while being swivelled, one of them above the axis, the other beneath it.

Abstract: A hydraulic pump driven by any suitable power source, such as by an electric motor energized from a storage battery supplies water under hydraulic pressure by way of a control valve unit to a plurality of pairs of downwardly and outwardly-inclined nozzles disposed at various locations around the boat's hull above the water line thereof. These include a forwardly-located pair of nozzles on the starboard and port sides respectively and also three pairs of nozzles near the stern of the boat, the first pair upon the starboard and port sides being directed downward and forward for backward maneuvering, the second pair being directed downward and outward on the starboard and port sides respectively for side-wise maneuvering, and the third pair being directed downward and rearward also on the starboard and port sides for forward maneuvering. A first modification makes use of a downwardly and rearwardly directed nozzle with an optional flow-reversing deflector amidships on the transom of the boat.

Abstract: A propulsion system for a hydrofoil, planing or semi-planing sea-going vessel having a hull having a port pump water inlet formed therethrough on its port side, a starboard pump water inlet formed therethrough on its starboard side and first, second and third outlets formed therethrough, comprises a booster first stage system in the hull coupled to and driven by the motors. The booster first stage system comprises a first axial water jet pump at the port pump water inlet and a second axial water jet pump at the starboard pump water inlet. A second stage water jet system in the hull aft of the first stage system comprises a third axial water jet pump functioning as a turbocharger.

Abstract: This invention is directed mainly to a propelling apparatus and a control for said propelling apparatus for use with a boat. This invention can be used with a small boat for pleasure and also for fishing. The propelling apparatus comprises a pump in the form of a propeller and a motor for driving the impeller. Also, there is a novel heat exchanger arrangement and a novel mounting device for support of the motor in a driving relationship with the propeller. Further, there is a novel heat exchanger and muffler combination for the exhaust gases from the motor.

Abstract: An improved boat thruster including a diverter valve having an inlet connected to a water pump and a pair of outlets extending to either side of the boat. Each outlet includes a primary nozzle and a deflector movable to a first position wherein it allows water flow from the primary nozzle to be discharged to one side to thus thrust the boat to the opposite side. Each deflector is also movable to second and third positions for directing the primary nozzle water flow to respective secondary nozzles for discharging the water either forwardly or rearwardly to thus thrust the boat in the opposite direction. The secondary nozzles each have an exit area smaller than that of the primary nozzle.