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An engine fails on one side of a twin during the take-off roll, above the decision speed, and the aeroplane continues.

Which lateral-directional property most directly limits the minimum control speed?

  • A.The roll mode time constant
  • B.The rudder power available against the asymmetric yawing moment
  • C.The Dutch roll damping ratio
  • D.The spiral mode time to double amplitude at the engine-out condition

Answer: B

Minimum control speed is set by whether the rudder can generate enough yawing moment to balance the asymmetric thrust at that speed, with the bank angle limited by the certification rules. It is a control-power question rather than a modal one. Dutch roll damping, spiral divergence and the roll constant all describe the aeroplane's free motion, and while they matter for handling after the failure, none of them sets the speed below which directional control cannot be maintained.

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