Which low-bypass afterburning turbofan jet engine is used to power the Saab JAS 39 Gripen?
Volvo RM12 The Volvo RM12 is a low-bypass afterburning turbofan jet engine developed for the Saab JAS 39 Gripen fighter. A version of the General Electric F404, the RM12 was produced by Volvo Aero (now GKN Aerospace Engine Systems).
J-2X The J-2X is a liquid-fueled cryogenic rocket engine that was planned for use on the Ares rockets of NASA's Constellation program, and later the Space Launch System. Built in the United States by Aerojet Rocketdyne (formerly, Pratt & Whitney Rocketdyne), the J-2X burns cryogenic liquid hydrogen and liquid oxygen propellants, with each engine producing 1307 kN of thrust in vacuum at a specific impulse ("I") of 448 isp . The engine's mass is approximately 2,470 kg (5,450 Lb), significantly heavier than its predecessors.