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Nasa unveils quiet supersonic aircraft in effort to revive commercial flights
(www.theguardian.com)
just science related topics. please contribute
note: clickbait sources/headlines aren't liked generally. I've posted crap sources and later deleted or edit to improve after complaints. whoops, sry
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I don't screen everything, lrn2scroll
S.A.B.E.R. was the project name I believe, synergetic air breathing rocket engine.
Basically you intake air at lower speeds and transition to LOX when necessary.