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Statement I: A longer tail arm permits a smaller tail area for the same tail volume coefficient.

Statement II: Tail volume coefficient is the product of tail area and tail arm, normalised on wing reference quantities.

In the light of the above statements, choose the correct answer.

  • A.Statement I is correct but Statement II is incorrect
  • B.Statement I is incorrect but Statement II is correct
  • C.Both Statement I and Statement II are correct
  • D.Both Statement I and Statement II are incorrect

Answer: C

Both are true and the second is exactly why the first holds. It is the single relation a designer leans on hardest when the fuselage length changes, since a stretch hands over tail volume without any change to the surfaces.

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