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Bamboo-copter was a toy in China, dated to 400 BC. A Rotary Fan also existed in China around 180 AD. I'm interested in both of those things, as they work on the exact same principle.

Do we have any archaelogical finds of them? Absent that, are there any detailed drawings of them dating from those periods?

I can find tons of pictures of these things online, but they all look like modern versions. I want to see original versions, because it's very critical to see the blade shape. In particular, I want to know if the blades were plain rectangles, or had some curves in them, especially washout twist like you see in modern propellers.

  • dating from those periods There's no evidence the Bamboo Dragonfly existed in "400 BC". This looks like a typo for 400 CE. – Semaphore May 31 '18 at 16:34
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    @Semaphore If it is, it's a typo on Wikipedia too. The article has a cite for it, but it's some book I don't have. – DrZ214 May 31 '18 at 16:54
  • Yes, I was suggesting whoever wrote that on Wikipedia made a typo. Regardless, the first attestation to the bamboo dragonfly is the early 4th century document cited on Wikipedia, so there's no earlier primary source. – Semaphore May 31 '18 at 17:13
  • @Semaphore - Might be worth going to the WP page's "talk" page and making that point there too. – T.E.D. May 31 '18 at 18:12
  • 400 BC is also in the cited book Principles of Helicopter Aerodynamics with CD Extra By Gordon J. Leishman "The ideas of vertical flight can be traced back to early Chinese tops, a toy first used about 400 BC." - page 6 – congusbongus May 31 '18 at 22:54

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