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I think MacAttack's approach is a good one. I went to an automotive aerodynamics seminar before where the presenter was telling us real world examples of in-field aero improvements he made to a drag car. After looking over the car, he actually taped rolled up magazines/pamphlets into some grooves and hollows around where the windshield was, and that resulted in measurable gains in their 1/4 mile times.I think his point was that you don't need a wind tunnel and CFD, and you can actually do pretty good work with simple techniques like tufts, applying colored oil to see where the wind takes it, and doing coast down measurements for drag.
I think MacAttack's approach is a good one. I went to an automotive aerodynamics seminar before where the presenter was telling us real world examples of in-field aero improvements he made to a drag car. After looking over the car, he actually taped rolled up magazines/pamphlets into some grooves and hollows around where the windshield was, and that resulted in measurable gains in their 1/4 mile times.
I think his point was that you don't need a wind tunnel and CFD, and you can actually do pretty good work with simple techniques like tufts, applying colored oil to see where the wind takes it, and doing coast down measurements for drag.