Abstract: An electrically powered engine has tip-driven fan assembly. The engine includes an electric motor which comprises a rotor mounted on the periphery of the fan assembly and a stator mounted to the frame. Power is supplied to the electric motor by a metal/air battery assembly mounted to the frame and having a cylindrical shape. The fan assembly produces a flow of air with at least a portion of this air flow being directed through the interior of the battery assembly. The battery assembly comprises a plurality of metal/air battery cells each having a cylindrical anode, a cylindrical cathode with insulating spacers forming an annular chamber for holding the battery electrolyte.