Engine Model: PW 1000000 lb LH2. Designer: Pratt and Whitney. Propellants: Lox/LH2. Thrust(vac): 4,457.000 kN (1,001,973 lbf). Isp: 425 sec. Isp (sea level): 354 sec. Burn time: 420 sec. Chambers: 1. Country: USA. Status: Study 1988. Part of launch vehicle proposed by Martin as alternative to NLS. All figures estimated based on 1,000,000 lb thrust single engine.
PW 1000000 lb LH2 used on Rocket Stages