Accession Number : ADD013950

Title :   Fuel Efficient Propulsion for Outboard Motors.

Descriptive Note : Patent, Filed 29 Jun 87, patented 17 Jan 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gearhart, Walter S

Report Date : 17 Jan 1989

Pagination or Media Count : 5

Abstract : Vanes are mounted to an assembly affixed upstream of propeller blades of an outboard motor, creating a counterswirl in the fluid flow to counter the swirl produced by the propeller rotation, enabling on essentially axial discharge jet. The vanes are applied to only a 180 degree sector of the inflow to the propeller. This invention relates to a propeller drive unit for motorboats and more particularly to a fuel efficient propulsor for motorboats. It is the purpose of the marine propulsor to convert rotational shaft energy into a propulsive thrust. Ideally, this conversion is to be accomplished with the most efficient, vibration-free and inexpensive device. However, emphasis on achieving a particular goal such as efficiency, propulsor weight, mechanical simplicity or cavitation resistance may limit the designer in the type of propulsor configuration to be selected. Patents, PAT CL 460-66. (jes)

Descriptors :   *FUELS, *MOTORS, *OUTBOARD, *PATENTS, CAVITATION, CONFIGURATIONS, DRIVES, EFFICIENCY, ENERGY, PROPELLER BLADES, PROPELLERS, PROPULSION SYSTEMS, RESISTANCE, ROTATION, SHAFTS(MACHINE ELEMENTS), THRUST, WEIGHT

Subject Categories : Air Breathing Engines(unconventional)

Distribution Statement : APPROVED FOR PUBLIC RELEASE