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I agree with Phil: the 4 degree run was best, and comparing it to the 10 & 13 degree runs, I think there's a marked difference - tufts swirling "in space" at the higher numbers vs. staying close to the surface in the 4 degree run. I'd go out on a limb and call that the difference between attached/turbulent vs. detachment.
Also, my videos show a clear improvement in flow with the full belly pan. I think it's pretty important for the best performance of a boat tail.
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