Patent ID: 6991499
Filing Date: 2006-01-31
Classification: B63H

Abstract:
1. A waterjet propulsion apparatus comprising, in combination: a rotor comprising a plurality of rotor blades coupled to a hub, said rotor blades each having a tip and each being shaped so as to have uneven loading from the hub to the tip; wherein said rotor has five said rotor blades; a first housing section surrounding said rotor further having an interior surface and wherein said rotor blades are disposed within first housing section so that the tips of the rotor blades define a clearance with respect to the interior surface of the first housing section; wherein a clearance between each rotor tip and an interior surface of said first housing section is within the range of about 0.050″ and 0.150″; a stator comprising a plurality of stator blades coupled to a stator hub; wherein said stator has eight blades coupled to said stator hub; and a second housing section surrounding said stator.