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A design team specifies a laminar flow section for an airline transport's wing. The likely outcome is

  • A.Little benefit; the surface will not stay clean
  • B.A large and reliable drag reduction
  • C.An increase in maximum lift
  • D.A higher critical Mach number

Answer: A

Insects, rain, erosion and manufacturing waviness all trip the boundary layer, and the narrow lift coefficient band over which the benefit exists narrows it further. In-service drag is typically close to a conventional section's.

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