Fecha de publicación: 21/01/1992 Fuente: WIPO "wine" A drive train for an air thrust propulsion boat which has a propeller encircled by a noise reducing and efficiency increasing shroud. The shroud and propeller rotate about a generally vertical axis providing steering control for the boat. A plurality of rudders are attached to the rearward side of the propeller shroud in the slipstream of the propeller and serve as a secondary means for steering the boat. An engine which powers the propeller is remotely positioned from the propeller giving the boat a lower center of gravity. Connected to the engine is an automotive type automatic transmission which gives the boat both forward and reverse motion capabilities.