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If it's a rocket launch, happens at around engine ignition, and it sounds like some variation of 'whooop', you can bet it's the sound of turbomachinery very rapidly spooling up. Consider those turbopumps go from zero to tens of thousands of RPMs in fractions of a second, they cover the whole range of audible frecuencies, fast. I actually ended here while ...


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The ablator is more to protect the structure itself than the propellant quality/boil-off. Ablator was used in certain areas of the shuttle External Tank for this reason. This quote from "A Technical History of the External Tank" (not online) describes the initial design which didn't include the complete covering of the tank with the classic orange foam. ...


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I asked, and Tory actually answered April 6, but Twitter didn't send notices, I wasn't paying close attention, and I wasn't really sure how it worked. Anyway, I found it today, and I don't think he really answered the specific question, but this is what he said. Tory Bruno Verified account @torybruno Apr 6 Replying to @GregHan21100390 Any ...


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