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An internal sting balance measures forces by

  • A.Measuring the pressure at a single tap
  • B.Timing the model's motion
  • C.Sensing strain in a flexure mounted inside the model
  • D.Weighing the model before and after the run

Answer: C

Strain gauges on a carefully designed flexure inside the model resolve the aerodynamic load into its components. Keeping the components separate, so that a large normal force does not contaminate a small axial one, is the central design difficulty of such a balance.

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