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The first attempt to weaponize a ramjet came in 1915, when the Hungarian inventor Albert Fono proposed to build an artillery shell with a built-in ramjet that would activate after the shell was fired from a gun, substantially boosting range and payload for a given cannon size. The proposal was IOTL rejected.

What if it were not, and supersonic ramjets were a fairly mature propulsion technology by 1918 and during the interwar? What impact would a functional supersonic engine (even one that could only be used after you first got up to Mach 1) have on the development of aviation technology and air strategy between the wars?
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