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The total drag of a body in low-speed flow is conventionally split into

  • A.Interference drag and trim drag
  • B.Parasite drag and wave drag
  • C.Skin-friction drag and pressure or form drag
  • D.Wave drag and induced drag

Answer: C

Skin friction comes from the shear stress integrated over the surface and pressure drag from the pressure deficit left by separation. Which dominates depends on the body: a streamlined shape is nearly all friction, a bluff one nearly all pressure drag.

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