There are a couple of sketches which have been described as such, but they don’t resemble real devices that strongly. For example, da Vinci’s “plane” is really an ornithopter, a device which is supposed to fly by flapping its wings. The “helicopter” is a device with a screw-shaped spiral “wing” which is supposed to spin. And the “tank” is a sort of conical wagon with batteries of cannon sticking out of it. The modern names are the closest equivalents we have to da Vinci’s fanciful sketches of devices which would never actually work.
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