To provide an exhaust structure of a jet propulsion boat capable of easily reducing exhaust noise.
The exhaust structure 30 of the jet propulsion boat has a water- jet propulsion machine 20 provided in the pump chamber 16 of a hull 11 and a driving engine 15 is connected to the machine 20. An exhaust port 33 of an exhaust pipe 31 mounted in the engine 15 faces the pump chamber 16 and a resonator 40 for silencing noises is provided in the exhaust pipe 31. In the exhaust structure 10 of the jet propusion boat, the resonator 40 is bent into a meandering condition with the bent parts of the resonator set in adjacent positions to integrate the entire resonator 40 into an approximately flat shape. The integrated flat resonator 40 is run along the ceiling wall 17 of the pump chamber 16.
MIURA KOKICHI
TSUCHIYA MASAHIKO
