Finally learned the distinction between a ramjet and a scramjet. Ramjet slows incoming air to subsonic to combust it, scramjet is "supersonic combustion ramjet", and combustion happens while air in engine is > Mach 1 in reference frame of engine.
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Not gonna lie, I thought the two terms were interchangeable.
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Can get even wilder with external combustion. https://www.jhuapl.edu/Content/techdigest/pdf/APL-V08-N02/APL-08-02-Billig.pdf …
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