Exhaust outlet structure for personal watercraft

Abstract

A shut-off member provided on a rear end of an exhaust passage of the personal watercraft is formed to have such a shape that one of the ends of a short pipe made of nitrile rubber is flatly made, thereby including a lip portion having upper and lower side walls which come in contact with each other, and is protruded rearward and downward from a hull of the watercraft. A portion between the upper and lower side walls coming in contact with each other forms a slit to act as an exhaust port. The slit is substantially shut off based on a molding shape thereof if there is no difference between internal and external pressures of the shut-off member, and is opened against the elastic force of a surrounding flexible material depending on a differential pressure and a flow rate of an internal fluid if the internal pressure becomes higher than the external pressure.

Dependencies are inferred from the claim text.