Volocopter 2X multirotor electric helicopter.
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Previously:
https://www.homemadetools.net/forum/...144#post141458
https://www.homemadetools.net/forum/...176#post138386
https://www.homemadetools.net/forum/...285#post134952
https://www.homemadetools.net/forum/...837#post152460
https://www.homemadetools.net/forum/...219#post149989