Steering and propulsion device for watercraft

Details Steering and propulsion device for watercraft Steering and propulsion device for watercraft

1976-07-26

1978-02-21

Kunin, Stephen G.

Ships

Building

Canal and ferry boats

60222, 114151, 115 16, 115 42, 415 68, B63H 514

Patent

active

040746526

ABSTRACT:
A two-stage axial flow steering and propulsion device has impellers operable by a right-angle reversible drive mounted on a watercraft, and a housing surrounds the blades of the impellers. The housing is mounted for rotation in opposite directions about an axis intersecting with and perpendicular to the blades' rotational axis. The device is therefore capable of a wide range of watercraft steering and propulsion maneuvers. A shroud structure in the form of a venturi-type ring surrounds each of the impellers thereby defining three separate pressure regions of positive pressure ahead of one of the impellers which pulls the fluid when rotating in one direction, a negative pressure between the impellers and a negative pressure behind the other impeller which pushes the fluid when rotating in such one direction.

REFERENCES:
patent: 1805597 (1931-05-01), Pratt
patent: 3127865 (1964-04-01), Pleuger
patent: 3590766 (1971-07-01), Jackson

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