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The single most important practical reason boundary-layer theory matters to a designer is that it

  • A.Determines the aircraft's maximum Mach number
  • B.Fixes the position of the aerodynamic centre
  • C.Sets the wing's aspect ratio
  • D.It predicts where the flow will separate

Answer: D

Separation governs pressure drag, maximum lift, stall behaviour and buffet, and none of it can be obtained from an inviscid calculation. Everything else in this topic -- the thicknesses, the shape factor, transition, control devices -- exists to answer that one question.

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