Fell down a rabbit hole last night of reading about rotor ships: https://en.wikipedia.org/wiki/Rotor_ship
The aircraft equivalent is the Flettner airplane which uses spinning rotors instead of wings, which seems so bonkers counterintuitive:
Video of a working model one to show that this isn't just someone's bizarre fantasy https://www.youtube.com/watch?v=hlmvHfIAszo
@fraggle @cwebber You can make a quick model one with a pencil, a rubber band, and two paper cups. Tape the cups together at their bases, attach one end of the rubber band to the pencil, wind the rubber band around the cups semi-tight so when you hold the pencil and fling it up in the air it makes them spin. Kidlet showed me how a while back.
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