Credit: Boeing / Rocketdyne
AKA: MB-XX;RS-73. Status: Design 2004. Date: 1999. Thrust: 266.70 kN (59,957 lbf). Unfuelled mass: 591 kg (1,302 lb). Specific impulse: 467 s. Height: 3.30 m (10.80 ft).
Boeing's Rocketdyne Division (USA) and Mitsubishi Heavy Industries (Japan) had announced on 14 February 2000 their agreement to jointly design and develop the MB-XX family of high-power cryogenic upper-stage engines for Boeing's Delta-4 and Japan's H-2A launch vehicles. In 2005 the MB-XX was being demonstrated on funding from Boeing and Mitsubishi Heavy Industries for potential application to the Vision for Space Exploration launch vehicle or upgrades to today's EELVs.
Engine: 591 kg (1,302 lb).