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Which constraint is usually most sensitive to the maximum lift coefficient achievable with flaps?

  • A.The cruise constraint
  • B.The ceiling constraint
  • C.The sustained turn constraint
  • D.The landing constraint

Answer: D

Approach speed follows from wing loading divided by the landing lift coefficient, so a better flap system allows a heavier wing loading for the same field length. This is why high-lift devices earn their weight and complexity.

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