Assegai Mk.1 powered by a Boreus afterburning turbojet. The aircraft was powered by two Pratt & Whitney TF30 afterburning turbofan engines. The F-16 Fighting Falcon entered service powered by the Pratt & Whitney F100 afterburning turbofan. The General Electric F101 is an afterburning turbofan jet engine. The aircraft's powerplant incorporates two Saturn AL-31F afterburning low-bypass turbofan engines, fed through intake ramps. The Su-30MKI is powered by two Al-31FP afterburning turbofans. Thrust was most commonly increased in turbojets with water/methanol injection or afterburning. This Bureau also produced the Kuznetsov NK-144 afterburning turbofan engine. It was powered by a conventional derivative of the F-22 afterburning turbofan, designated F119-PW-614C. Dry specific thrust has impact upon the performance of afterburning turbofans. The "Vampire" was powered by a single Bristol-Siddeley Orpheus afterburning turbojet engine producing of thrust. In normal flight, the -614S was configured as a conventional afterburning turbofan. Development of the WS-15 afterburning turbofan engine began in the early 1990s. . In July 1954, the J65-B-3 was replaced by the afterburning J65-W-7 turbojet. Without afterburning it is hard to reach supersonic flight speeds.