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The vertical speed indicator works by sensing

  • A.Acceleration in the vertical axis
  • B.The rate of change of static pressure through a calibrated leak
  • C.The difference between total and static pressure
  • D.The absolute static pressure

Answer: B

A capsule connected to the static line is surrounded by a case that bleeds towards the same pressure through a restriction, so the pressure difference is proportional to rate of change. The restriction is also the source of the instrument's characteristic lag.

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