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A NACA 0009 section is

  • A.Cambered with nine degrees of twist
  • B.Symmetric and nine per cent thick
  • C.Cambered and nine per cent thick
  • D.Symmetric and ninety per cent thick

Answer: B

Leading zeros mean no camber and no camber position, so the section is symmetric, and the final pair gives the thickness. Thin symmetric sections of this kind are common on tailplanes and fins, which must work equally in both directions.

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