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A reduction gearbox is essential on a turboprop because

  • A.The turbine turns far too fast
  • B.The turbine turns too slowly for the propeller
  • C.It reverses the direction of rotation
  • D.It provides the engine's lubrication

Answer: A

A gas generator may turn at twenty or thirty thousand revolutions a minute where a propeller wants one or two thousand. Reduction ratios above ten to one are common, and the gearbox is a substantial part of the engine's weight and cost.

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