The article by Frank Morring, Jr., and Jefferson Morris on the J2X rocket engine (AW&ST Nov. 14, p. 39) brought the following:

Downix wrote: The J-2X has little commonality with the Saturn era J-2 engine. The J-2X involves many interim developments. First, you have the J-2S, which was developed late in the 1970s and nearly ended up being used on the shuttle as a stop-gap. After that, you had the J-2T, which explored new...

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