Bladeless wind turbine.
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Previously:
https://www.homemadetools.net/forum/...816#post190625
https://www.homemadetools.net/forum/...804#post179037
https://www.homemadetools.net/forum/...741#post174839
https://www.homemadetools.net/forum/...942#post171643
https://www.homemadetools.net/forum/...538#post166666