Hi there. I've been trying to figure out several things about the shuttle stack lately whose answers have proven elusive to me. First, I've gotten varying results as to the total thrust each solid rocket booster produces at maximum. NASA claims it is 2.8 million pounds increasing to 3.3 million pounds each. Other sources I've found claim they produce 3.1 million pounds each. Which of these is correct, or are neither correct? Also, is the 104% rated performance 104% of the 1.2 million pounds the orbiter's engines produce, or did they produce less than 1.2 million pounds total at one time? I read that at some point their power was increased from what it was in the early days.
Second, I'm wondering if the thrust of the shuttle stack increases after max Q. The SI-C stage of the Saturn V increased to over 9 million pounds after passing through max Q, that's why I'm wondering. If in fact the shuttle stack does have greater total thrust after max Q, does anyone have an actual number for that? Thanks.