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The chief practical drawback of a laminar flow airfoil is that

  • A.Its low drag is easily lost to surface contamination
  • B.It cannot produce any lift at positive incidence
  • C.It always stalls at a very low angle of attack
  • D.It cannot be manufactured from metal or composite

Answer: A

The favourable gradient only holds if the surface is smooth and clean, so insects, rain or manufacturing waviness can trip the layer early and return the drag to normal levels. This is why the gains are often smaller in service than in the tunnel.

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