Abstract: A surface effect ship and a system of cushion pressurization by forcing into the cushion chamber a homogeneous mixture of air and gas. The surface effect ship is provided with a hull, having propulsion device, associated with rudders, and a skirt to confine the pressurized cushion chamber beneath the ship. In order to decrease the empty weight and thus to increase the performance of the surface effect ship, the traditional heavy and complicated mechanical lift system for cushion pressurization is substituted by a combination of a source of gas with a gasdynamical converter, as a lift system, to feed the cushion chamber of the surface effect ship by a homogeneous air and gas mixture. A turbojet engine is used as a source of highly energetic gases, and the gasdynamical converter is used for augmentation and homogenization of the mixture of air and gas.