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Increasing an aerofoil's thickness ratio generally

  • A.Raises maximum lift, lowers critical Mach
  • B.Raises the critical Mach number
  • C.Reduces the wing's structural depth
  • D.Has no effect on maximum lift

Answer: A

A thicker section accelerates the flow more strongly over it, so sonic conditions arrive at a lower free-stream Mach number. The compensation is more room for spar depth and fuel, and usually a higher maximum lift coefficient.

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