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Q&A What is the earliest time a pulsejet could be built?

Let's assume that some wealthy characters somehow find the plans for a valveless pulsejet. How is not important. Maybe there was a time travel incident, or some Atlantean book was unearthed, or som...

5 answers  ·  posted 6y ago by Eth‭  ·  last activity 5y ago by Eth‭

Question alternate-history history flying-machines