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Installed thrust differs from bare engine test bed thrust because

  • A.The engine runs faster in flight
  • B.The fuel is different
  • C.The nozzle is removed for testing
  • D.Nacelle drag and offtakes take a share

Answer: D

A test bed measures the engine alone under controlled conditions, while an installed engine must also pay for spillage, nacelle drag and any air or power taken for the airframe. The difference is accounted for carefully in performance guarantees.

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