Patent ID: 8206191

Claim:
A water jet propulsion watercraft comprising: a hull; and a pair of jet propulsion devices attached to the hull and arranged to the right and left of a hull centerline; wherein each of the pair of jet propulsion devices includes: a jetting unit arranged to jet water toward a rear of the hull; a deflector supported on the hull and arranged to rotate, with respect to the hull, to the right and left within a predetermined rotation range including a straight drive position, the deflector including a forward drive jet port and a reverse drive jet port, the deflector arranged to change a jetting direction of the water jetted from the jetting unit; and a bucket supported on the hull independently of the deflector so as to be displaced between a forward drive position retreated from the forward drive jet port and a reverse drive position of blocking the forward drive jet port; the bucket includes: a reflecting surface arranged to receive the water jetted from the forward drive jet port and to reflect the water toward an inner side of the deflector when the bucket is at the reverse drive position; and an auxiliary nozzle including an entrance opened to the reflecting surface and arranged to jet water introduced into the entrance along a hull right/left direction; wherein the entrance of the auxiliary nozzle is spaced away from the forward drive jet port in the hull right/left direction and does not oppose the forward drive jet port in a state where the bucket is arranged at the reverse drive position and the deflector is arranged at the straight drive position; a water flow is not jetted from either of a pair of the auxiliary nozzles respectively provided in a pair of the buckets respectively provided in the pair of right and left jet propulsion devices when the pair of the buckets are at the reverse drive positions and a pair of the deflectors respectively provided in the pair of right and left propulsion devices are at the straight drive positions; and a water flow is jetted from one of the pair of auxiliary nozzles respectively provided in the pair of the buckets and a water flow is not jetted from the other of the pair of auxiliary nozzles when the pair of the buckets are at the reverse drive position and the pair of the deflectors are rotated to either the right or the left from the straight drive positions.