Accession Number : ADD001384

Title :   Variable Geometry Marine Propulsor.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Mantle,Peter J

Report Date : 20 Aug 1974

Pagination or Media Count : 4

Abstract : 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.

Descriptors :   *Marine surface propulsion, *Patents, Propellers(Marine), Hydrodynamic control surfaces, Hydraulic equipment, Fluid flow

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE