Motorboat propeller safety shroud

Details Motorboat propeller safety shroud Motorboat propeller safety shroud

1993-09-20

1995-02-14

Avila, Stephen P.

Marine propulsion

Screw propeller

Having means to control flow around propeller

440 71, B63H 1100

Patent

active

053890213

ABSTRACT:
A protective enclosure and propulsive system for a motor-driven multi-bladed marine propeller includes a shroud housing which is positioned about the propeller that rotates on its axial through bore, the shroud, providing a safety barrier for the propeller and its underwater enviroment, while also improving the thrust of the propeller by having a converging exit cone containing a horizontal control vane between the sides of this cone, where the cone and control vane both extend rearward of the propeller and at the same negative angle relative to the shroud's centerline.

REFERENCES:
patent: 2139594 (1938-12-01), Kort
patent: 2551371 (1951-05-01), Grigg
patent: 3066893 (1962-12-01), Mercier
patent: 3658028 (1972-04-01), Koons
patent: 3842786 (1974-10-01), Uroshevich
patent: 3885516 (1975-05-01), Uroshevich et al.
patent: 4680017 (1987-07-01), Eller
patent: 4694645 (1987-09-01), Flyborg et al.
"Report of the Propeller Guard Subcommittee" by The National Boating Safety Adulsory Council, Nov. 7, 1989.

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