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Thanks charlie,
I looked at the pages you said, wouldnt the best cap be the one with the lowest drag coefficient? Based on table 4.6.1 wouldnt this be around 10-12*? or because this is done at relatively low velocities 3m/s does this make a difference? I know that laminar flow depends on velocity so this would probably be what youre talking about forming vortex where this test in the paper would not?
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