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The effects of changes on a scale model are just that, they apply solely to the scale model and can't be translated to full scale models unless Reynolds numbers matches between the two models. How fluid dynamics behave at a given Reynolds number is not the same as an other Reynolds number. Basically, what you'll get putting a 1:18 scale model in a wind tunnel with 60 mph airspeed will not scale properly for a full size model at 60 mph airspeed.
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