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Which flight condition is used as the reference when a derivative set is quoted?

  • A.The trim condition
  • B.The stall
  • C.The never-exceed speed
  • D.Maximum thrust

Answer: A

The reference is the trim condition about which the equations were linearised, and it is why every set is labelled with a speed, altitude, weight and configuration. The stall is where the linear model breaks down and is studied by other means. Never-exceed speed and maximum thrust are limits rather than reference conditions, though sets are certainly evaluated near them as part of exploring the envelope.

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