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Tasdrouille & Robert, please explain how this makes a difference when comparing a change on a model. I understand that you can't scale the results on a case by case basis when taken individually. But when you make a change to something, why would Reynolds numbers & such make any difference? If all other conditions remain the same but, say, the addition of a square truck cap, why would the results not be legitimate? It is comparing “Cap On”-“Cap Off”.
The question is not a quantitative one such as finding out the horsepower it takes to go 50mph on a 60°F day, at 70% humidity, 30.02” barometric pressure, at 500’ above sea level. For this question I could fully understand why you need “Similitude”.
If you are incapable of explaining in detail why a change to the scaled model can not be tested, so that it is easy to understand, then please, do not reply.
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