Vehicles for travelling over water

Claim 1

A VEHICLE FOR TRAVELLING OVER WATER COMPRISING A MAIN BODY HAVING AT LEAST TWO WALLS DEPENDING FROM THE BOTTOM THEREOF, THE WALLS BEING SPACED APART AND EXTENDING SUBSTANTIALLY PARALLEL TO EACH OTHER AND TO THE FORE AND AFT AXIS OF THE VEHICLE, CLOSURE MEANS CLOSING THE GAPS BETWEEN SAID WALLS AT THE TWO ENDS OF THE VEHICLE, SAID WALLS AND SAID CLOSURE MEANS DEFINING WITH THE BOTTOM OF SAID MAIN BODY AN AIR SPACE BENEATH THE VEHICLE, THE CLOSURE MEANS AT THE REAR END BEING FORMED AT LEAST IN PART BY A ROTATABLE MEMBER HAVING PADDLES OR VANES AND MOUNTED FOR ROTATION ON A HORIZONTAL AXIS TRANSVERSE TO THE FORE AND AFT AXIS OF THE VEHICLE, SAID ROTATABLE MEMBER BEING PARTIALLY IMMERSED IN THE WATER AND HAVING ITS AXIS OF ROTATION SO DISPOSED WITH RESPECT TO THE BOTTOM OF SAID MAIN BODY AS TO ACT, ON ROTATION, AS A PUMP TO RAISE THE PRESSURE OF THE AIR IN THE SPACE BENEATH THE VEHICLE WHEREBY THE VEHICLE IS AT LEAST PARTIALLY SUPPORTED ON A CUSHION OF PRESSURISED AIR.