Underwater exhaust system for boats of stepped-hull construction

Details Underwater exhaust system for boats of stepped-hull construction Underwater exhaust system for boats of stepped-hull construction

1988-07-11

1989-06-20

Peters, Jr., Joseph F.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

60310, B63B 134

Patent

active

048405892

ABSTRACT:
An underwater exhaust system which acts to increase the speed of a boat, to reduce fuel consumption, to improve handling and to reduce the skin friction of the water in high seas. The exhaust system basically comprises an exhaust box built into the hull over the bottom of the boat and a diffuser positioned between the exhaust box and the boat bottom. The engine exhaust is directed through the exhaust box and out the exhaust holes of the diffuser into the water. A pump is used to pump seawater into the exhaust box for cooling of the exhaust. Also, there is a step in the hull. The step is positioned approximately 25% from the transom of the stern. The combination of the step and the directing of the exhaust under the hull enhances the speed of the boat and its handling.

REFERENCES:
patent: 3198162 (1965-08-01), Larsen
patent: 3296997 (1987-01-01), Hoiby
patent: 4002136 (1977-01-01), Michalak
patent: 4393802 (1983-07-01), Rizzo
patent: 4744778 (1988-05-01), Porter
patent: 4786265 (1988-11-01), Porter

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