Jet propulsion apparatus for boats

Claim 1

HYDRAULIC PROPULSION APPARATUS FOR A BOAT COMPRISING A HOLLOW REACTION TUBE HAVING AN OUTER ELONGATED CYLINDRICAL TUBULAR CASING OPEN AT BOTH ENDS AND FIXEDLY SECURED LENGTHWISE TO THE BOTTOM OF SAID BOAT, A SECOND CYLINDRICAL TUBE ARRANGED CONCENTRICALLY WITHIN SAID OUTER CASING AND HAVING A LONGITUDINAL WALL DISPOSED IN SPACED RELATION WITH RESPECT TO THE LONGITUDINAL WALL OF THE OUTER CASING, SAID SECOND TUBE HAVING A LENGTH LESS THAN THE LENGTH OF THE OUTER CASING AND HAVING ITS OPPOSITE ENDS CONNECTED TO THE LONGITUDINAL WALL OF THE OUTER CASING TO THEREBY PROVIDE AN ELONGATED TUBULAR CHAMBER THEREBETWEEN, THE OPPOSITE ENDS OF SAID SECOND TUBE BEING OPEN AND IN COMMUNICATION WITH THE INTERIOR OF THE OUTER CASING WHEREBY FLUID ENTERING EITHER END OF THE OUTER CASING FLOWS LENGTHWISE THROUGH SAID SECOND TUBE, MEANS WITHIN THE CHAMBER BETWEEN THE OUTER CASING AND THE SECOND TUBE AND ARRANGED INTERMEDIATE THE LENGTH OF SAID SECOND TUBE TO DIVIDE THE CHAMBER INTO A FRONT COMPARTMENT AND INTO A REAR COMPARTMENT, MEANS FOR CONDUCTING FLUID IN A PREDETERMINED DIRECTION FROM THE FRONT COMPARTMENT TOWARD THE INTERIOR OF SAID SECOND TUBE, MEANS FOR CONDUCTING FLUID FROM THE REAR COMPARTMENT TOWARD THE INTERIOR OF SAID SECOND TUBE IN AN OPPOSITE DIRECTION TO THE DIRECTION IN WHICH FLUID IS CONDUCTED FROM THE FIRST COMPARTMENT, A FLUID DISTRIBUTION MEANS ARRANGED TO CONTAIN FLUID UNDER PRESSURE, MEANS FOR CONNECTING SAID FLUID DISTRIBUTION MEANS WITH SAID FRONT COMPARTMENT, SEPARATE MEANS FOR CONNECTING SAID FLUID DISTRIBUTION MEANS WITH SAID REAR COMPARTMENT, AND MEANS FOR CONTROLLING THE FLOW OF FLUID FROM SAID FLUID DISTRIBUTION MEANS TO SAID FRONT COMPARTMENT AND TO SAID REAR COMPARTMENT.