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Basic Gas Turbine Rating » Basic Turbine Knowledge » Turbine Engine Types

64.4 Turbine Engine Types

64.4.2 Compare the working cycle of a turbine engine and a piston engine. 

Gas Turbine Engine

  • combustion occurs at a constant pressure
  • induction, compression, combustion and exhaust occur continuously
  • continuous action and is not enclosed so pressure is constant and volume increases
  • no peak or fluctuation pressures
  • requires light fabricated combustion chambers
  • low octane fuels


Piston Engine

  • occurs at a constant volume
  • induction, compression, combustion and exhaust occur intermittently
  • only one stroke is utilized in the production of power
  • no continuous action and is enclosed so pressure rises and volume is constant
  • peak pressures in excess of 1,000 lb. per sq. in.
  • requires cylinders of heavy construction
  • high octane fuels


64.4.4 Describe the comparative advantages of turbine engines versus piston engines for aircraft propulsion. 

Gas turbine engines

  • have the ability to develop more power for a given size.
  • are  lighter weight (better power to weight ratio).
  • are more compact, meaning less drag.
  • are more reliable, and
  • can use cheaper fuel (kerosene).


64.4.6 Describe the basic constructional arrangements of the following engine types- 

The Gas Turbine engine works on the principal of turning a relatively small mass of air into a relatively large acceleration.

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