Accession Number : ADD011307

Title :   Fuel Efficient Propulsor for Motor Boats.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gearhart,W S

Report Date : 20 Jul 1984

Pagination or Media Count : 9

Abstract : This patent application discloses an improved propulsor for motorboats which includes a plurality of cambered skegs or fins mounted forward of the propeller which are placed in a manner so that a counter-swirl is generated in the fluid in the direction counter to the swirl produced by the propeller rotation . The cambered skegs and the fairing strut are designed to reduce the swirl caused by the propeller in the slipstream of the fluid. Thus the discharge jet from the propeller will be essentially axial and losses associated with the swirl in slipstream are appreciably reduced.

Descriptors :   *Patent applications, *Marine propellers, Hydrodynamic control surfaces, Water flow, Counterrotation, Circulation, Slipstream, Axial flow, Fins, Fairings, Struts, Camber, Marine surface propulsion, Outboard, Boats, Shrouded propellers

Subject Categories : Surface Transportation and Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE