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I wonder if dust is shaking off that surface.
I'd be happy to observe under-tail tufts for you if we were neighbors, but perhaps the easiest do-it yourself approach would be to tape a digital camera under the tail. Even a very basic one will usually make movies a few minutes long.
I've heard that another quick test for turbulent/laminar flow is the speed of evaporation. If you wet your car and drive a bit, the last wet, shiny areas have laminar flow.
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There is no excuse for a land vehicle to weigh more than its average payload.
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