Marine propulsion system

Claim 1

A JET PROPULSION SYSTEM FOR A BOAT HAVING A FLOATING STRUCTURE WITH A BOTTOM, SIDE WALLS, A TRANSVERSE REAR WALL AND A LONGITUDINAL AXIS, COMPRISING A MOTOR MOUNTED IN SAID FLOATING STRUCTURE ADJACENT SAID REAR WALL AND HAVING A DRIVE SHAFT DISPOSED TRANSVERSELY OF SAID LONGITUDINAL AXIS AND EXTENDING FROM OPPOSITE ENDS OF SAID MOTOR, A ROTARY PUMP AT EACH OF THE OPPOSITE ENDS OF THE MOTOR AND HAVING A ROTATABLE CASING HAVING A DISCHARGE OPENING AND A ROTOR CONNECTED TO AND DRIVEN BY SAID DRIVE SHAFT, EACH OF SAID PUMPS HAVING AN INTAKE PASSAGE OPENING THROUGH THE BOTTOM OF SAID STRUCTURE AND TWO DISCHARGE PASSAGES, A FIRST OF SAID DISCHARGE, PASSAGES EXTENDING FROM SAID PUMP DIRECTLY THROUGH SAID REAR WALL AND DISCHARGING A JET REARWARDLY OF SAID BOAT WHEREBY THE DISCHARGE OF WATER FROM SAID PUMPS EXERTS A FORWARD THRUST ON SAID BOAT, THE SECOND OF SAID DISCHARGE PASSAGES OPENING THROUGH THE BOTTOM OF THE BOAT AND DIRECTED FORWARDLY WHEREBY THE DISCHARGE OF WATER FROM THE PUMPS EXERTS A REARWARD THRUST ON THE BOAT, THE DISCHARGE PASSAGES OF ONE PUMP BEING SPACED LATERALLY FROM THOSE OF THE OTHER PUMP, EACH SAID PUMP CASING BEING ROTATABLE BETWEEN A FORWARD DRIVE POSITION IN WHICH DISCHARGE OF WATER FROM SAID OPENING IS THROUGH SAID FIRST DISCHARGE PASSAGE DIRECTED REARWARDLY OF SAID BOAT AND A REVERSE DRIVE POSITION IN WHICH DISCHARGE OF WATER FROM SAID OPENING IS THROUGH SAID SECOND DISCHARGE PASSAGE DIRECTED FORWARDLY OF SAID BOAT, UNITARY MEANS FOR CO-ORDINATING THE CONTROL OF BOTH OF SAID PUMPS, SAID SYSTEM INCLUDING SAID MOTOR AND PUMPS BEING DISPOSED IN A SPACE BETWEEN SAID SIDE WALLS AND ADJACENT SAID REAR WALL HAVING A LESSER EXTENT IN THE DIRECTION OF SAID LONGITUDINAL AXIS THAN IN A DIRECTION TRANSVERSE OF SAID LONGITUDINAL AXIS.