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Old Oct 30, 2012, 06:26 PM
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My understanding is that when you lose lift over the main wing, because of inadequate airspeed and too high of an AOA, the wingtips with washout will have just a little bit of a negative AOA relative to the rest of the wing and will therefore stall a little later.

This provides a little more transition into a stall condition instead of the sudden snap and then you're not flying anymore. Makes it a little more predictable. I think this is more important with sailplanes that have very high aspect ratio wings.

At least that's how I understand it.
It gets more complicated than that in a hurry, and if there's any Aeronautical Engineers here, we might find out. Different airfoils and different shaped wings react differently. For example, the tapered wing of a Spitfire acts like washout, so you don't have to build that in...(I think I read that once).
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