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at how the wings would flex in turbulence"
If you have flown a MD-11 or DC-10 in a little turbulence, now that's a sight. It is as if the wing wants to flap like a bird to get along.
I once witnessed a stall test in a B-747. The 747 wing can flex in a real S-shape. You can look between the (retracted) flaps and the rear spar. Fascinating.