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In the NACA four-digit designation 2412, the digit 2 represents

  • A.Maximum thickness as a percentage of the chord
  • B.The position of maximum thickness in tenths
  • C.The design lift coefficient in tenths
  • D.Maximum camber as a percentage of the chord

Answer: D

The first digit gives maximum camber as a percentage of chord, the second its position in tenths of chord, and the last two the thickness as a percentage. So 2412 has two per cent camber at four tenths chord and is twelve per cent thick.

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