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Adverse Yaw

Adverse Yaw

  • Since the downward deflected aileron produces more lift as evidenced by the wing raising, it also produces more drag. This added drag causes the wing to slow down slightly.
  •  This results in the aircraft yawing toward the wing which had experienced an increase in the lift (and drag). From the pilot’s perspective, the yaw is opposite the direction of the bank.
  • The adverse yaw is a result of differential drag and the slight difference in the velocity of the left and right wings.
  • Adverse yaw becomes more pronounced at low airspeeds. At these slower airspeeds aerodynamic pressure on control surfaces are low and larger control inputs are required to effectively maneuver the airplane.
  • As a result, the increase in aileron defl ection causes an increase in adverse yaw. The yaw
  • is especially evident in aircraft with long wing spans.
  • Application of rudder is used to counteract adverse yaw. The amount of rudder control required is greatest at low airspeeds, high angles of attack, and with large aileron defl ections.
  • Like all control surfaces at lower airspeeds, the vertical stabilizer/ rudder becomes less effective, and magnifi es the control problems associated with adverse yaw.

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