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Module 11. Aeroplane aerodynamics, structures and systems

Compared with the flap up configuration the maximum angle of attack for the flaps down configuration is

  • unchanged.
  • larger.
  • smaller.

Explanation

Trailing-edge flaps increase camber, which raises the lift curve but causes the wing to reach its maximum lift coefficient at a lower angle of attack. So compared with flaps up, the maximum (stalling) angle of attack in the flaps-down configuration is smaller, even though the stall speed is lower because CLmax is higher.

vmartin asking:

in Cl/aoa graphics, flaps-down line remains upwards parallel. so, why the answer is not unchanged?

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