Discussion
Consider the following pairs of wing feature and its principal purpose:
Washout - Delaying tip stall
Dihedral - Lateral stability in sideslip
Winglet - Raising effective span
Taper - Increasing the wing's thickness ratio
How many of the pairs given above are correctly matched?
Answer: C
Correct answer: Only three
Washout delays tip stall, dihedral provides lateral stability in sideslip through the rolling moment it generates, and a winglet raises the effective span by weakening the tip vortex - three correct pairs. Taper has nothing to do with thickness ratio: it is the ratio of tip to root chord, and it exists to approach elliptical loading and to save structural weight.
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