The patent relates to a marine propulsive apparatus and a device and method for increasing the apparatus' efficiency by controlling the amount of wetting of the apparatus over a range of speeds. A housing, mounted in a cavity formed in the stern of a ship, encloses a drive shaft connected to a propeller. A control surface is pivotally connected to the hull of the ship ahead of the propeller and in a raised position contacts the stern portion of the hull to form the upper wall of the cavity. A hydraulic device is used to raise and lower the control surface, the latter directing the flow of water across the propulsive apparatus. As the speed of the ship increases wetting of the propulsive apparatus is decreased.


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    Title :

    Variable Geometry Marine Propulsor


    Contributors:

    Publication date :

    1973


    Size :

    4 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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