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A reciprocating engine driving a propeller remains common on light aircraft because it is

  • A.Lighter than a turbine for the same power
  • B.More efficient at high altitude
  • C.Capable of higher speeds than a turbine
  • D.Cheap, efficient at low power and simple to maintain

Answer: D

Gas turbines scale badly to small sizes, where their efficiency falls and their cost stays high. The piston engine is heavier for a given power but far cheaper, which decides the matter for most aircraft below a few hundred horsepower.

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