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True. I think in reality even the RD-810 is till now just on the drawing board. I remember reading that its never actually been fabricated or flown. So SCE-200 is practically a new engine.

Can't wrap my head around how that thing will turn at 19,000 rpm. Its a bloody amazing piece of tech when you think about it.

I was about to write ullage motors but then I realized its lower stage and a solid motor :rofl: