Boat propulsion unit with a propulsion propeller arranged under

Details Boat propulsion unit with a propulsion propeller arranged under Boat propulsion unit with a propulsion propeller arranged under

1994-02-28

1995-03-14

Swinehart, Edwin L.

Marine propulsion

Screw propeller

With means effecting or facilitating movement of propulsion...

B63H 512

Patent

active

053972554

ABSTRACT:
A boat propulsion unit has a propeller which can be withdrawn into a sleeve to a position above the plane of the boat's bottom and enclosed by a cover plate. The water in the closed sleeve can be pumped out, so that the emptied sleeve is accessible for inspection and maintenance operations.

REFERENCES:
patent: 2699138 (1955-01-01), Dyer
patent: 2885990 (1959-05-01), Hawthorne
patent: 3030910 (1962-04-01), Alsager
patent: 3045622 (1962-07-01), Kittredge
patent: 3678872 (1972-07-01), Migliaccio et al.
patent: 3941073 (1976-03-01), Ridgeway
patent: 4441278 (1984-04-01), Covey, III

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