Marine propulsion – Screw propeller – Having means to control flow around propeller
Patent
1987-12-16
1989-05-23
Peters, Jr., Joseph F.
Marine propulsion
Screw propeller
Having means to control flow around propeller
440 39, B63H 116
Patent
active
048326348
ABSTRACT:
A device for protecting a propeller of a boat motor and for improving the efficiency and therefore the performance characteristics of the motor. The device includes a tubular shroud main body portion which includes a pair of half-sections pivotally secured to one another about a first pair of lower, axially aligned edges. Fastening devices are provided along a second pair of upper, axially aligned edges for clamping the half-sections about the propeller. Mounting plate assemblies are mounted on the main body portion half-sections adjacent the upper, axially aligned edges for resiliently gripping a pair of anti-cavitation plates projecting horizontally outwardly from the motor housing. The shroud main body portion is also provided with an elongated slot along the first pair of axially aligned edges for receiving a skeg projecting downwardly from the housing below the propeller. Forward and rearward grills are provided to prevent inflow of trash or other debris into the shroud. In addition, the shroud main body portion tapers axially, from forward end to rearward end to create a venturi effect as flow exits the shroud.
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patent: 4487152 (1984-12-01), Larson
patent: 4680017 (1987-07-01), Eller
patent: 4699597 (1987-10-01), Oja
Peters Jr. Joseph F.
Sotelo Jesus D.
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