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The drag bucket seen in the drag polar of a laminar-flow section is

  • A.The region of maximum lift
  • B.A region of negative drag
  • C.The stalling region of the section
  • D.A narrow band of lift coefficient with laminar flow

Answer: D

Inside a limited band of lift coefficient the favourable gradient survives on both surfaces and the drag drops sharply, giving the characteristic bucket. Outside that band the stagnation point moves and transition jumps forward, so the advantage disappears abruptly.

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