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Mr. Big Black Friday joined in and replied with this 48 minutes ago, 36 seconds later, 9 minutes after the original post[^][v]#1,438,380
I almost said Rutherford engine because I saw some interview with the CEO of rocket lab on YouTube but then I realized I have no idea who Rutherford is and an engine isn’t a person and I don’t remember what the CEOs name is.
Mr. Big Black Friday double-posted this 47 minutes ago, 1 minute later, 11 minutes after the original post[^][v]#1,438,382
Instead of a turbo pump they use a lithium ion battery hooked up to an electric motor, which apparently the math for that doesn’t work because it doesn’t have a high enough energy density but the way they solved it is when the battery gets used up it just falls out and then that works.