Supercruise is the ability of aircraft to cruise at supersonic speeds without the afterburner. The powerful F135 engine gives good subsonic acceleration and energy, with supersonic dash in afterburner. The F101 was GE's first turbofan with an afterburner. The engine's 2-position afterburner exhaust nozzle was also used for idle thrust control. The TF30-P-6 did not require an afterburner for its subsonic role. Its engine produces a maximum of 78.7 kN (17,700 lbf) of thrust with afterburner. Later installations had the final nozzle mechanically actuated separately from the afterburner nozzle. With these design considerations and no afterburner, the F-117 is limited to subsonic speeds. Without an afterburner there was no variable nozzle already available. The particles and any combustible gases may be combusted in an "afterburner". It produces of thrust in afterburner. The F-94 was to be the first US production jet with an afterburner. Zip fuel was retained for the engine's afterburner to increase range. Growth to over of thrust in afterburner was projected. This feature can be overridden by the pilot by selecting max afterburner.