Helicopter flight trainer

Claim 1

IN A TRAINER FOR A HOVERING TYPE AIRCRAFT, THE COMBINATION OF: AN AIRCRAFT ASSEMBLY INCLUDING POWERED MEANS FOR HOVERING AND FLIGHT AND INCLUDING FLIGHT CONTROLS; AN AIR CUSHION VEHICLE CONSTITUTING A MOBILE BASE STRUCTURE CONSTRUCTED TO PROVIDE AN AIR CUSHION UNDER THE MOBILE BASE STRUCTURE; AND RIGID MEANS RIGIDLY MOUNTED ON SAID BASE STRUCTURE AND EXTENDING UPWARAD FROM THE BASE STRUCTURE AND PIVOTALLY CONNECTED TO THE AIRCRAFT ASSEMBLY AT A POINT ON THE ASSEMBLY TO GIVE THE ASSEMBLY FREEDOM TO ROTATE RELATIVE TO THE BASE STRUCTURE ABOUT A POINT ON THE ASSEMBLY ON AN UPRIGHT AXIS THAT IS FIXED RELATIVE TO THE BASE STRUCTURE AND TO TILT LATERALLY ABOUT SAID POINT WHEREBY THE ATTITUDE OF THE AIRCRAFT ASSEMBLY IS AERODYNAMICALLY DETERMINED BY THE FLIGHT CONTROLS, SAID BASE STRUCTURE BEING MOVABLE ON AN AIR CUSHION ALONG THE GROUND IN RESPONSE TO THE AERODYNAMIC FORCES GENERATED BY THE AIRCRAFT ASSEMBLY AND BEING CONSTRUCTED TO PROVIDE THE AIR CUSHION WITH CHARACTERISTICS FOR RESISTING TILTING MOVEMENTS THEREON CREATED AT SAID POINT BY THE AERODYNAMIC FORCES.