초록 ▼

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 pos

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.

대표청구항 ▼

An underwater exhaust system for use with the bottom of the hull of a boat oriented in its position of intended use and having an engine giving off exhaust gas, the bottom of the hull extending from the bow to the stern of the boat and being defined between port and starboard chines and being divide

An underwater exhaust system for use with the bottom of the hull of a boat oriented in its position of intended use and having an engine giving off exhaust gas, the bottom of the hull extending from the bow to the stern of the boat and being defined between port and starboard chines and being divided by a longitudinally extending centerline, said system comprising: an exhaust box mounted in the interior of said hull, said exhaust box defining a hollow interior and having a top opening and bottom opening; first pipe means for conveying the exhaust gas from said engine into the top opening of said exhaust box; a step extending from the port chine to the centerline and then to the starboard chine transversely across the entire bottom of the port and the starboard portions of said hull, said step defining within said hull on each of said port and starboard portions a generally planar recessed bottom aft of said step, said recessed bottom occupying a plane spaced from and being positioned inward relative to an imaginary generally planar surface defined by the aftward extension of the portion of said hull positioned forward of said step; and diffuser mean connected to said exhaust box and being positioned along the portion of said recessed bottom aft of said transverse step, said diffuser means for controlling the passage of the exhaust gas from said exhaust box along the exterior of said planar recessed bottom portion in an aftward direction.