Ssme
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If the entire ACC remained with the Shuttle until SSME cutoff, then the payload mass the Orbiter and ACC could place into orbit would total 57,300 pounds. Discarding the ACC shroud as early as possible in the Shuttle’s eight-minute climb to orbit ...
May 11, 2012 at 04:24 | Source: Wired News
Incidentily the J2 Engine was used as the basis for the future development of the Space Shuttle Main Engine or SSME if using NASA acronyms.
May 27, 2012 at 00:16 | Source: Flight Global.com