 This requirement was met on 20 July 2001.Instead of using lift engines or rotating nozzles on the engine fan like the Harrier, the "LiftSystem" has a shaft-driven LiftFan, designed by Lockheed Martin and developed by Rolls-Royce, and a thrust vectoring nozzle for the engine exhaust that provides lift and can also withstand the use of afterburners in conventional flight to achieve supersonic speeds.The lifting/propulsion system with its Three Bearing Swivel Duct Nozzle (3BSD) most closely resembles plans for the Convair Model 200 Sea Control Fighter of 1973 than the preceding generation of STOVL designs to which the Harrier belongs.