Fecha de publicación: 25/06/1991 Fuente: WIPO "wine" A boat hull for an air thrust propeller driven boat is provided that includes a double hull construction along at least a portion of the length of the hull. The lower member of the double bottom portion of the hull is provided with a plurality of apertures. Air can be supplied to the hull apertures from two air sources, one of which is exhaust gas emitted from the exhaust manifolds of an internal combustion engine, and the other of which is air diverted from the slipstream of a propeller which is powered by the internal combustion engine. The air from the two air sources is channeled to the hull apertures, which direct the air against the water beneath the hull, thereby forming an air boundary layer beneath the boat to reduce friction between the underside of the boat and the underlying water. The hull further includes two heat exchanging tubes positioned on either side of the hull adjacent to the double hull portion that channel circulating cooling water from the exhaust manifolds to dissipate heat from the exhaust manifolds to the water beneath the hull.