Patent ID: 7524220

Claim:
A water jet propeller, comprising: an impeller housing disposed in a rear portion of a hull, the impeller housing including a front end portion formed to have an inside diameter that gradually increases forwardly, and a rear portion formed to have an inside diameter having a substantially constant diameter; an impeller disposed inside the impeller housing, said impeller being disposed so as to circumvent a front end portion of an inner periphery of the impeller housing; a cylindrically shaped stator disposed at a rear end portion of the impeller housing; and a nozzle disposed at a rear end portion of the stator, the nozzle having a diameter that gradually diminishes rearwardly, wherein the impeller housing includes a liner disposed over a region facing the impeller, the liner forming the inner periphery of the impeller housing, except for the front end portion thereof, the liner having a substantially constant inner diameter, and the jet propeller propels the hull by expelling a water jet from a rear end portion of the nozzle using water that flows in from a water flow duct forward of the impeller housing by rotating the impeller, and wherein the impeller housing includes a plurality of mounting brackets formed on an outer perimeter of the front end portion thereof and a rear flange formed on the rear end portion thereof, the plurality of mounting brackets for mounting the impeller housing to the hull, and the rear flange for mounting the impeller housing to the stator.