Abstract: A jet propulsion engine assembly for aircraft embodying a longitudinal tubular pod or nacelle housing having an open air intake nose. This assembly includes an axial air flow impeller supported longitudinally in the interior of and by the housing, and it has an annular array of rotary blades supported therein upon a rotatably supported, longitudinal and generally central shaft to force air from the intake nose longitudinally back toward the tail end of said housing. A central jet engine within this housing has a longitudinal drivable shaft substantially aligned with the impeller shaft and drivably connected thereto by disengageable clutching means for effecting drive of the latter from the former when the engine shaft is power driven by the central engine.