Discussion
Wing washout, that is a twist giving the tip a smaller incidence than the root, is used mainly to
Answer: B
Reducing the tip incidence keeps the tip sections further from their stalling angle than the root, so the root stalls first. The stall then spreads outboard, the ailerons remain in attached flow, and roll control survives into the stall. It also shifts the loading inboard, which relieves the wing bending moment.
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