I have seen this so many times. This was built using paper and slide rules about 20 years after ww2 which ONLY had propeller driven fighters and only the very first rocket technology appearing just towards the end of the war.
Jet engines and beyond that the ramjet is mind blowing to me because the faster they get the fewer parts they have and the greater their propulsion efficiency. The only barrier to the technology is material sciences having to deal with those temperatures, pressures, stresses and friction.
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