In older graphics depicting the evolution of the SLS vehicle, it states that the Block 2 upgrade was to produce 11.9 million lbs of thrust. At some point in the last few years, however, this has quietly been updated to a more reasonable 9.5 million lbs. Quite the difference. How did NASA originally intend to fulfil the original thrust requirement? Was it a mistake?enter image description here

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    $\begingroup$ They intended to change the SRB's at some point and I guess they have bailed back out. $\endgroup$
    – geoffc
    Feb 6 at 18:55
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    $\begingroup$ I would guess it has to do with the originally planned completely new boosters versus the currently planned "Booster Obsolescence Life Extension" boosters (BOLEs). $\endgroup$ Feb 6 at 19:27
  • $\begingroup$ Yeah, notice the change in the booster graphics at the 11.9M point. $\endgroup$ Feb 6 at 22:04


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