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Depends on what you are trying to accomplish. If you are comparing different aircraft, it probably doesn't matter as long as you always do it the same way. If you are designing a wing, the exposed area is what matters. If your wing has taper, you might want to determine the number at multiple points as the tip will be lower than the root, and might be able ...


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Reynolds number is a variable parameter. There are multiple definition and you can use one of the two MAC, the important thing is that you specify the reference of your calculation. Usually between MAC of gross and exposed wing it would not change a lot(I would expect 10% changes), and seen that we are speaking of the order of magnitude of at least 1*10^6 ...


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