I’ve posted about the ongoing testing of the J-2X a few times in the past. The J-2X is planned to be the upper stage engine for NASA’s new Space Launch System (SLS). There have been a couple of test firings since my last post. The first is a short duration firing:
The second is a record-breaking firing, running over nineteen minutes in duration. That’s far longer than the J-2X will need to fire in operation on a typical launch. Things are looking good so far for the J-2X:
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