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Spoilers are often used for roll control at high speed in place of ailerons because

  • A.They do not twist the wing to work
  • B.They are lighter than ailerons
  • C.They produce no drag
  • D.They work only at low speed

Answer: A

A spoiler dumps lift locally by separating the flow and produces very little pitching moment on the section, so it does not suffer reversal. Many transports lock the outboard ailerons at high speed and roll on spoilers and inboard ailerons for exactly this reason.

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