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The first digit of a NACA four-digit aerofoil designation gives

  • A.Maximum camber as a percentage of chord
  • B.Maximum thickness as a percentage of chord
  • C.The design lift coefficient
  • D.The leading-edge radius

Answer: A

The first digit is the maximum camber in per cent of chord, the second its position in tenths, and the last two the thickness in per cent. A NACA 2412 therefore carries two per cent camber at four tenths chord and is twelve per cent thick.

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