The Tupolev OOS was a Soviet concept for an air-launched, single-stage-to-orbit spaceplane. The OOS's proposed carrier aircraft, the Antonov AKS, was a twin-fuselage concept plane consisting of two An-225 fuselages and was powered by 18 Progress D-18T turbofan engines, with the placements of the engines both above and below the wings.
The Tupolev OOS was a Soviet concept for an air-launched, single-stage-to-orbit spaceplane. The OOS's proposed carrier aircraft, the Antonov AKS, was a twin-fuselage concept plane consisting of two An-225 fuselages and was powered by 18 Progress D-18T turbofan engines, with the placements of the engines both above and below the wings.
Source: Wikipedia "Tupolev OOS" · CC BY-SA 4.0
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