Ships – Hull or hull adjunct employing fluid dynamic forces to... – Having fluid channeling or entrapping configuration
Reexamination Certificate
2007-06-12
2007-06-12
Olson, Lars A. (Department: 3617)
Ships
Hull or hull adjunct employing fluid dynamic forces to...
Having fluid channeling or entrapping configuration
C114S285000, C248S642000, C440S06100B, C440S069000
Reexamination Certificate
active
11304355
ABSTRACT:
A shallow draft boat has a hull that protects a propulsion propeller within a tunnel that passes only partially through the hull from stern to bow. The hull has a mechanism, such as a flap for selectively permitting or blocking water flow access to the tunnel from under the boat. The boat also has a lift mechanism preferably in the shape or adjustable parallelogram for selectively positioning a propeller of a propulsion unit substantially directly behind the tunnel or below the tunnel. The boat can operate in two modes. In one, water access to the tunnel is permitted and the propeller is positioned above the bottom of the hull and behind the tunnel. In the other, water access to the tunnel is blocked and the propeller is positioned below the bottom of the hull. This construction permits selective operation in a shallow draft mode, in a normal draft mode or in between. In the shallow draft mode, 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: 3990660 (1976-11-01), Pipoz
patent: 4713028 (1987-12-01), Duff
patent: 4757971 (1988-07-01), Mapes
patent: 4836124 (1989-06-01), Haasl
patent: 4842559 (1989-06-01), Litjens et al.
patent: 6544081 (2003-04-01), Paulo
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Olson Lars A.
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