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At static conditions on the ground, the streamtube entering a pitot intake is

  • A.Larger than the intake area, contracting towards it
  • B.Smaller than the intake area, expanding towards it
  • C.Exactly equal to the intake area
  • D.Non-existent, since there is no forward speed

Answer: A

The engine draws air from a wide region ahead of it and accelerates it into the duct. That is why the lip must be well rounded and why intake performance on the ground differs so sharply from its behaviour in high speed flight.

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