| 摘要 |
PROBLEM TO BE SOLVED: To attach a large-capacity volume chamber having a large exhaust noise reducing effect to an exhaust pipe by reasonably using a dead space in a boat. SOLUTION: Parts of exhaust pipes 19 and 24 are raised in the vicinity of the pump room 8 of a jet propeller 11 so as to cross the center line C of a boat body 2, and hermetically sealed volume chambers 30A to 30C are connected to the raised portion 24 such that at least a part is positioned above the jet propeller 11 or the pump room 8. Thus, by reasonably using a dead space 27 above the jet propeller 11 or the pump room 8, the large-capacity chambers 30A to 30C having large exhaust noise reducing effects are attached to the exhaust pipes 19 and 24.
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