MB-XX is a new family of cryogenic upper stage rocket engines jointly developed by MHI Group and Aerojet Rocketdyne (previously Pratt & Whitney Rocketdyne).
The MB-XX uses liquid oxygen/liquid hydrogen as propellant and is designed as a reliable high-performance, affordable, low-risk upper stage engine family to meet the growing and varied global demands. Development of the MB-XX was started in 1999, component testing was completed in 2004, and system level demonstrator hot-fire testing was completed in September 2005.
|Thrust (vacuum)||35,000 - 60,000 lbf|
|Weight||760 - 1,300 lb|
|Length||87 - 130 in|