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The stall situation

The stall situation

  • The stall situation can be aggravated by a T-tail configuration, which affords little or no pre-stall warning in the form of tail control surface buffet.
  •  The T-tail, being above the wing wake remains effective even after the wing has begun to stall, allowing the pilot to inadvertently drive the wing into a deeper stall at a much greater AOA.
  •  If the horizontal tail surfaces then become buried in the wing’s wake, the elevator may lose all effectiveness, making it impossible to reduce pitch attitude and break the stall.
  •  In the pre-stall and immediate post-stall regimes, the lift/drag qualities of a swept-wing aircraft (specifi cally the enormous increase in drag at low speeds) can cause an increasingly descending fl ightpath with no change in pitch attitude, further increasing the AOA. In this situation.
  • without reliable AOA information, a nose-down pitch attitude with an increasing airspeed is no guarantee that recovery has been effected, and up-elevator movement at this stage may merely keep the aircraft stalled.

 

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