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Increasing dynamic pressure has what effect on the dimensional derivatives?

  • A.It scales them down in proportion
  • B.It affects only the control derivatives
  • C.It scales them up in proportion
  • D.It leaves them unchanged

Answer: C

Every dimensional derivative carries a factor of dynamic pressure, so they all scale up in proportion, which is why modal frequencies rise with speed and fall with altitude. The non-dimensional coefficients are what stay put at a given Mach number. Nothing scales down with dynamic pressure, and the effect applies to stability and control derivatives alike, since both are dimensionalised the same way.

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