what are the exact geometry of single blade of archimedes wind turbine.what would be the shape of each blade

we want to fabricate small model of archimedes turbine for testing

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You'll need to calculate the required dimensions, since only you know the size of turbine that you plan to create.
See the attached image though, the structure appears to be based on proportion, and not on dimensions. The design follows that of a Nautilus shell, or the "golden ratio" of ~1.618

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