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A smoke tunnel is chiefly useful for

  • A.Showing streamline patterns at low speed
  • B.Measuring drag accurately
  • C.Testing at supersonic Mach numbers
  • D.Determining structural loads

Answer: A

Fine filaments of smoke trace the streamlines and make separation and circulation immediately visible, which is why smoke tunnels are so effective for teaching and for a first look at a shape. They are qualitative instruments and are not used for force data.

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