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@gbj_tester
That's what people used to think:
but modern thinking is to select covering texture according to the place on the body; putting it simplistically you want smooth and shiny on leading edges, and rougher where the air hits the surface at a glancing angle, with 'trips' at the point where flow separation would occur on homogeneous surfaces to keep the flow attached for a bit longer by turbulating the boundary layer. I don't think it matters what the fabric surface is like after full flow separation has occurred.
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