Boat propulsion means

Claim 1

A PROPULSION MEANS FOR A BOAT HAVING REARWARD AND FORWARD ENDS AND A BOTTOM, AN ELONGATED HOLLOW SHROUD OPERATIVELY SECURED AT ONE OF ITS ENDS TO THE REARWARD END OF SAID BOAT AND EXTENDING REARWARDLY THEREFROM AND INCLUDING REARWARD AND FORWARD ENDS AND A BOTTOM PORTION, SAID SHROUD HAVING A WATER INTAKE OPENING FORMED IN ITS LOWER PORTION ADJACENT ITS FORWARD END AND A DISCHARGE OPENING FORMED IN ITS REARWARD END, A MOVABLE PISTON MEANS RECIPROCATABLY MOUNTED IN SAID SHROUD BETWEEN THE INTAKE AND DISCHARGE OPENINGS THEREIN AND ADAPTED TO DRAW WATER INTO SAID SHROUD THROUGH SAID INTAKE OPENING AND TO FORCE WATER REARWARDLY FROM SAID SHROUD THROUGH SAID DISCHARGE OPENING, SAID PISTON MEANS BEING ADAPTED TO BE OPERATIVELY SECURED TO A RECIPROCABLE POWER MEANS, AND CONTROL MEANS OPERATIVELY CONNECTED TO SAID SHROUD TO SELECTIVELY DEFLECT THE WATER BEING DISCHARGED FROM SAID SHROUD TO CHANGE THE DIRECTION OF TRAVEL OF THE BOAT, SAID VALVE MEANS INCLUDING FIRST AND SECOND VALVE MEMBERS PIVOTALLY SECURED TO SAID PISTON MEANS AND MOVABLE TOWARDS AND AWAY FROM EACH OTHER, SAID FIRST AND SECOND VALVE MEMBERS BEING NORMALLY CLOSED AND HAVING TAPERED INNER ENDS ADAPTED TO ASSIST IN MOVING SAID FIRST AND SECOND VALVE MEMBERS TOWARD EACH OTHER WHEN SAID PISTON MEANS MOVES REARWARDLY WITH RESPECT TO SAID SHROUD, SAID PISTON MEANS INCLUDING A MOVABLE VALVE MEANS WHICH IS ADAPTED TO OPEN WHEN SAID PISTON MEANS MOVES FORWARDLY WITH RESPECT TO SAID SHROUD AND ADAPTED TO CLOSE WHEN SAID PISTON MEANS MOVES REARWARDLY WITH RESPECT TO SAID SHROUD.