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An external compression intake achieves its deceleration

  • A.By heating the incoming air
  • B.Through oblique shocks ahead of the cowl lip
  • C.Entirely inside the duct
  • D.Without any shock waves

Answer: B

Ramps or a centre body generate oblique shocks outside the intake, and a weak normal shock completes the transition at the throat. The arrangement is robust but the turned external flow carries a cowl drag penalty that grows with Mach number.

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