Jet boat pump

Claim 1

PROPULSION APPARATUS FOR WATERCRAFT COMPRISING: A WATER CONVEYING CONDUIT HAVING AN INLET END AND A RESTRICTED OUTLET END, A SHAFT EXTENDING LONGITUDINALLY AND CENTRALLY OF SAID CONDUIT, A PAIR OF ANNULAR BEARINGS SURROUNDING SAID SHAFT AND SPACED LONGITUDINALLY THEREOF, A PAIR OF ANNULAR BEARING SLEEVES SURROUNDING SAID BEARINGS, A PLURALITY OF RADIALLY EXTENDING STATOR VANES FIXED TO ONE OF SAID BEARING SLEEVES AND THE INTERIOR SURFACE OF SAID CONDUIT AND MOUNTING SAID BEARING SLEEVES CENTRALLY OF SAID CONDUIT FOR ROTATABLE SUPPORT OF SAID SHAFT; A FIRST HUB FIXED TO SAID SHAFT UPSTREAM OF SAID STATOR VANES AND POSITIONED BETWEEN SAID ANNULAR BEARING SLEEVES, A PLURALITY OF ROTOR BLADES FIXED TO SAID FIRST HUB; A SECOND HUB FIXED TO SAID SHAFT ADJACENT ONE OF SAID BEARING SLEEVES, A PLURALITY OF ROTOR BLADES FIXED TO SAID SECOND HUB, MEANS FOR ROTATING SAID SHAFT TO CAUSE SAID ROTOR BLADES TO PUMP WATER THROUGH SAID CONDUIT, SAID FIRST HUB HAVING A DIAMETER WHICH TAPERS LINEARLY WITH DISTANCE FROM A SMALLER OUTSIDE DIAMETER TOWARD THE INLET END TO A LARGER OUTSIDE DIAMETER ADJACENT SAID ONE BEARING SLEEVE, SAID ONE BEARING SLEEVE HAVING A CONSTANT OUTSIDE DIAMETER EQUAL TO THE DIAMETER OF SAID HUB AT ITS LARGER END, SAID SECOND HUB HAVING ONE END ADJACENT SAID BEARING SLEEVE, SAID SECOND HUB HAVING AN OUTSIDE DIAMETER WHICH INCREASES LINEARLY WITH DISTANCE FROM A DIAMETER AT SAID ONE END