Vehicles for travelling over land and/or water with means to recover air from the fluid curtain

Claim 1

A VEHICLE FOR OPERATING OVER LAND AND/OR WATER AND WHICH IS SUPPORTED ABOVE THE SURFACE OVER WHICH IT IS OPERATING BY AT LEAST ONE CUSHION OF PRESSURISED GAS FORMED AND CONTAINED BENEATH THE VEHICLE AT LEAST IN PART BY CURTAINS OF FLUID ISSUING FROM THE BOTTOM OF THE VEHICLE COMPRISING MEANS INCLUDING A FIRST SUPPLY PORT FORMED IN THE BOTTOM OF THE VEHICLE AT THE FRONT THEREOF FOR FORMING A SINGLE FLUID CURTAIN AT THE FRONT OF THE VEHICLE MEANS INCLUDING A SECOND SUPPLY PORT FORMED IN THE BOTTOM OF THE VEHICLE AT THE REAR THEREOF FOR FORMING A FLUID CORTAIN AT THE REAR OF THE VEHICLE, SAID FRONT AND REAR CURTAINS FORMING THE FRONT AND REAR BOUNDRIES OF SAID CUSHION OF PRESSURISED GAS, AND MEANS FOR RECOVERING INTO THE VEHICLE AT A POINT REARWARDLY OF SAID FIRSTS SUPPLY PORT AT LEAST PART OF THE FLUID TO SAID SECOND PORT AND FOR SUPPLYING THE RECOVERED FLUID TO SAID SECOND SUPPLY PORT SO AS TO AT LEAST ASSIST IN FORMING THE CURTAIN AT THE REAR OF THE VEHICLE, SAID LAST NAMED MEANS INCLUDING A RECOVERY PORT FORMED IN THE BOTTOM OF THE VEHICLE INBOARD OF AND SPACED SLIGHTLY FROM SAID FIRST SUPLY PORT, THROUGH WHICH FLOWS THAT PART OF THE FLUID ISSUING FROM SAID FIRST SUPPLY PORT WHICH IS RECOVERED, AND A DUCT CONNECTING SAID RECOVERY PORT WITH SAID SECOND SUPPLY PORT INTO THE RECOVERY PORT.