Abstract: A vehicle, primarily a marine vessel, but also adaptable for travel over snow or ice, which is supported and propelled by air flow through a channel in the underside of the body. An impeller in a duct in the forward end of the vehicle provides the air flow, which can be deflected rearwardly, downwardly forwardly and varied laterally for full control of the vehicle. The air flow channel is divided into a central channel and high speed side channels by longitudinal curtains, the side channels conducting air to steering vanes and rudders at the rear of the body. Trim rudders also extend across the rear of the channel to control lift and roll at the rear of the vehicle. In one form, the vehicle has an inflatable bow to seal the forward end of the channel at low speed, or to open the channel to ram air at high speed.