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Aerodynamic coefficients such as lift coefficient are useful because they

  • A.Remove the dependence on size, speed and density
  • B.Give the force directly in newtons without further work
  • C.Apply only to one particular aircraft at one speed
  • D.Depend on the units chosen for the measurement

Answer: A

Dividing the force by dynamic pressure and a reference area leaves a dimensionless number that depends chiefly on shape, angle of attack, Mach number and Reynolds number. That is what lets wind tunnel results on a model be applied to a full-size aircraft.

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