Help with this flying machine. I think it is a concept / prototype designed in Europe in the nineteenth century.
3 Answers
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1$\begingroup$ Yes, I have another source for that sketch by Siemens [Rockets, Missiles and Men in Space, Willy Ley. Signet Books, New American Library, 1969] imgur.com/4jY8II3 imgur.com/aCiwhis $\endgroup$– xxavierCommented Feb 26, 2018 at 13:06