| 摘要 |
PROBLEM TO BE SOLVED: To improve attaching workability as well as to reliably position and attach a propulsion duct to a hull. SOLUTION: In a small boat in which a jet propulsion machine for injecting rearward water sucked from the bottom by the rotation of an impeller through a propulsion duct 12 is provided on a hull, a claw part 3b for positioning the hull vertical direction and a claw part 3c for positioning the hull lateral direction are formed on the upper position from a rotational axis of the impeller of the hull, stopper parts 200b, 200c are formed on the propulsion duct 12 so as to face both claw parts 3b, 3c, respective stopper parts 200b, 200c are positioned by being brought into contact with the claw parts 3a, 3b, and the propulsion duct 12 is attached to the hull.
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