Shallow draft boat with a tri-tunnel hull

Details Shallow draft boat with a tri-tunnel hull Shallow draft boat with a tri-tunnel hull

2004-07-12

2008-11-11

Basinger, Sherman (Department: 3617)

Marine propulsion

Screw propeller

Having means to control flow around propeller

C114S290000

Reexamination Certificate

active

07448927

ABSTRACT:
A shallow draft boat has a hull that protects a propulsion propeller within a tunnel that passes only partially through the hull from stem to bow. The hull causes mixing of water and air at high pressure during motion of the boat through the water, creating lift and a pressure gradient that keeps the tunnel filled. The boat prevents propulsion unit malfunction by keeping obstacles, such as debris, crab pots and mammals such as manatees from contact with the propeller.

REFERENCES:
patent: 1710904 (1929-04-01), Titcomb
patent: 2020792 (1935-11-01), Maynard et al.
patent: 2083959 (1937-06-01), McMullen
patent: 2234899 (1941-03-01), Higgins
patent: 3515087 (1970-06-01), Stuart
patent: 3626894 (1971-12-01), Stuart
patent: 3744446 (1973-07-01), Gibbins
patent: 4091761 (1978-05-01), Fehn

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