Wind Taumel Scheibe
6.9 x 3.3 x 6.6 feet Soerser Tal AachenA circular disk is gimbaled fixed in a gab. It is covered by a half disk, so the windforce reached only a half from the circular disk and pushed it backward. By a trick this is only possible by turning the half disk some around, so an other part of the circular disk is covered. An automatism starts.
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