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An elliptical lift distribution is produced most directly by a wing of

  • A.Highly tapered planform with a pointed tip
  • B.Any planform
  • C.Elliptical planform with no twist and constant section
  • D.Rectangular planform with no twist

Answer: C

An untwisted wing of elliptical planform made from one section gives an elliptical circulation distribution directly, which is why the Spitfire wing is the standard example. The same loading can be approached by combining taper with washout, and modern wings do exactly that, because an elliptical planform is expensive to build.

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