X-35B

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The shaft-driven lift fan propulsion system includes a thrust-vectoring rear nozzle, wing-mounted "roll post" ducts that provide lateral control and additional thrust, and a Rolls-Royce counterrotating fan - mounted immediately aft of the cockpit - driven by a Pratt & Whitney F119-611 engine via a drive shaft. The fan's cool thrust multiplies the engine's lifting force and contributes to a more benign ground environment. [LMTAS photo]

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