Other

Schottel-werft Josef Becker Gmbh & Co Kg

Schottel Gmbh & Co. Kg

Stefan Kaul

Reinhold Reuter

Stefan Huth

In a watercraft drive for a watercraft having front and rear propellers respectively mounted on a drive shaft in coaxial longitudinally displaced relationship, each of said propellers having at least two blades, the front and rear propellers having equal diameters and being driven at like rotational velocities. The central portion of the rear propeller up to a diameter equal to the diameter of the water jet arriving at the rear propeller, which due to the action of the front propeller has a contracted cross section, is designed to optimize the jet energy exiting the front propeller. The rear propeller has an annular area extending from the central portion to the outer circumference of the rear propeller, being designed with the same design as characterizes the front propeller. The annular area of the rear propeller receives a flow of surrounding ambient water.

Twin-propeller drive for watercraft

Watercraft drive with a rudder propeller

A hydrojet for ships, intended for use in shallow waters, has a semiaxially bladed impeller with a vertical axis of rotation rotatably arranged in a well-shaped housing. The drive for the impeller is introduced into the housing from the top through a cover plate, and the housing is closed at the bottom by a bottom plate which has a water inlet arranged in the center for axial admission to the impeller and at least one flatly sloped water outlet. A control device in which the water delivered by the impeller is fed to at least one outlet nozzle without conversion of kinetic energy into pressure energy, is arranged between the discharge end of the delivery channels of the impeller and at least one water outlet. The control device forms a ring channel without blading. The water inlet is designed asymmetrically. The bottom plate with the water inlet and the water outlet of which there is at least one, which water inlet and water outlet are integrated in it, is endlessly rotatable around the longitudinal axis of the housing in both circumferential directions, either as part of the housing, which is rotatable as a whole, or in relation to the housing, which may be part of the carrying ship design in the latter case.

Growing community of inventors

Harschbach, Germany

Stefan Kaul