The Pratt & Whitney J75 is an American axial-flow turbojet engine that was developed in the early 1950s. Its various models have thrust which ranges from 73.26 kN without afterburner to 117.88 kN with afterburner. It was used for a number of Century-Series fighters, including the Republic F-105 Thunderchief and the Convair F-106 Delta Dart.