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to a contra-rotating lift-fan located forward of the engine. The fan airflow (low-velocity unheated air) leaves through thrust-vectoring vanes on the underside of the aircraft, and balances the lift from the rear nozzle. For lateral stability and roll control, bypass air from the engine is used in a roll-post nozzle in each wing. For pitch control, the areas of exhaust nozzle and LiftFan inlet are varied while keeping the total

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