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.
A new video posted by GE Aerospace has fueled speculation that the American firm will use its dual-mode ramjet (DMRJ) engines to power a hypersonic successor to the SR-71 Blackbird. According to a ...
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