J-2 Rocket Engine

Five J-2 rocket engines powered the second stage of the Saturn V moon rocket, and one powered the third stage. A single J-2 also powered the second stage of the Saturn I-B rocket. The J-2 was the first, large, hydrogen fueled engine, and first to be able to be restarted multiple times during flight. An up-rated version of this engine will be used on the new Heavy Lift Vehicle being developed by NASA. (Flight-Ready Artifact)