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A normal shock intake becomes unattractive above about Mach 1.6 because

  • A.Normal shock loss grows rapidly
  • B.The intake area becomes too large
  • C.The boundary layer cannot be diverted
  • D.Ram compression becomes negligible

Answer: A

Loss across a normal shock rises steeply with the upstream Mach number, so a single shock wastes an unacceptable fraction of the available pressure. Splitting the deceleration across several weaker oblique shocks recovers most of that loss.

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