Look inside a ramjet engine, and all you'll see is an empty tube. Switch it on when it's on the ground and all you'll get is the same hollow tube with jet fuel squirting into it, achieving nothing.
Chinese "Space Transportation" company, Lingkong Tianxing Technology, has successfully tested its new JinDou400, also known as JinDouyun, ramjet detonation engine nearly twice the altitude of ...
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