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Which statement about the span efficiency factor is TRUE?

  • A.It is a property of the airfoil section rather than of the spanwise loading
  • B.It has no effect on the induced drag coefficient
  • C.It equals one for elliptical loading and is smaller for any other planar loading
  • D.It equals zero for elliptical loading and grows as the loading departs from it

Answer: C

The factor is defined so that the elliptical case, which is optimal, scores one, and every other planar loading scores less. It appears in the denominator of the induced drag coefficient, so a lower value means more drag for the same lift. It is a property of the spanwise loading and planform, not of the section.

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