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An airfoil at a very small negative angle of attack, below its zero-lift angle, will produce

  • A.The same lift as at the equivalent positive angle
  • B.Maximum lift for that section
  • C.Negative lift, that is a downward force
  • D.Zero lift under all circumstances

Answer: C

Below the zero-lift angle the pressure difference reverses and the section pushes downwards, which is exactly how a conventional tailplane produces its download. Nothing about the section prevents it working in that sense.

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