PCT No. PCT/EP91/02040 Sec. 371 Date Jun. 14, 1993 Sec. 102(e) Date Jun. 14, 1993 PCT Filed Oct. 29, 1991 PCT Pub. No. WO92/10660 PCT Pub. Date Jun. 25, 1992.An engine has a shroud which surrounds one of a propfan and a propeller having blades. The shroud has a variable geometry. A direction of the air flow inside a duct of the shroud is reversible via an adjustment of the blades for the reversal of the thrust of the engine. A separately movable nozzle ring forms a rearward end of the shroud. The nozzle ring is axially displaceable to an extent such that its trailing edge forms wherein air flow is promoted around the end of the shroud.
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