1,052,745. Air cushion vehicles. WESTLAND AIRCRAFT Ltd. June 12, 1963 [June 19, 1962], No. 23452/62. Heading B7K. An air cushion vehicle having a hollow flexible skirt is characterized in that the portion of the hollow flexible skirting surrounding the rear or stern portion of said vehicle is arranged to provide a generally vertical split substantially on the longitudinal centre line such that the individual mating parts of said hollow skirting are able to flex rearwardly when striking obstructions during forward motion of said vehicle. The rear part of the skirting surrounding the vehicle 1 (Fig. 1, not shown) is formed in two parts 2, 3 each formed with folded walls 4, 5 which, at the folds 6, abut at 8 and each form ducts 9 for curtain air. They are reinforced by panels 10, 11 and 12 and the two parts may be joined by straps or elastic ties. A central stability keel may extend rearwardly to seal the gap 8. Ballast weights could be attached to the bottom of the skirt in addition to or in place of the strap or elastic tensioning devices.