Darrieus rotor for vertical wind turbine .STL

**update: tested yet, survived the first storm** 5 blades with airfoil design Size: d = 20 cm, h = 22 cm, 2 mm generator axis Print upside down and you don’t need support or infill [cc-by-sa-4.0](https://creativecommons.org/licenses/by-sa/4.0/) Chris Langhans 2020

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