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it's a little messy but sailplanes sometimes use oil on the wings wich than produces streaks and patters, this will tell them things like flow sepparation etc and the best place to put turbulators. it might not apply to cars because of the different airflow over a car but it's worth a try
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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