Yes. We flow hydrogen through the engines to chill them before ignition. Being lighter than air, it rises along the sides of the cores to later flame up as we launch. Thus, making the Delta IV the most metal of all rockets https://t.co/Bp7mQMCFqH
— Tory Bruno (@torybruno) June 19, 2020
via Twitter https://twitter.com/torybruno
June 19, 2020 at 07:21PM
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