Fuel Efficient Propulsion for Outboard Motors.
Patent, Filed 29 Jun 87, patented 17 Jan 89,
DEPARTMENT OF THE NAVY WASHINGTON DC
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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
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