When considering the practicalities of building a wing skin, there will sometimes be lap joints, sheet overlaps, etc that cause small variances with the perfect airfoil (as defined by coordinates, formula, etc). Where is it best to put these small-but-present imperfections? Does the location differ for laminar sections vs turbulent sections?
My first guess would be that a location on the LE very near the stagnation point wouldn't be a bad spot, but the stagnation point will move with AoA. Locations aft of about 0.75 chord are likely to be turbulent no matter what and a small pip won't affect the situation much. Maybe locations on top of the wing from 0.2 chord to 0.6 chord would be a poor choice, increasing chance of an earlier stall and causing turbulent flow earlier than we'd get it otherwise. Again, just my rough guessing here.
My first guess would be that a location on the LE very near the stagnation point wouldn't be a bad spot, but the stagnation point will move with AoA. Locations aft of about 0.75 chord are likely to be turbulent no matter what and a small pip won't affect the situation much. Maybe locations on top of the wing from 0.2 chord to 0.6 chord would be a poor choice, increasing chance of an earlier stall and causing turbulent flow earlier than we'd get it otherwise. Again, just my rough guessing here.
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