#propjet__turboprop__turbopropellerplane  an airplane with an external propeller that is driven by a turbojet engine
  supertype:  #propeller_plane__propellerplane  an airplane that is driven by a propeller
  part:  #turbojet_engine__turbojet__turbofan__turbofan_engine  jet engine in which a turbine drives air to the burner
     part:  #afterburner  a device injects fuel into a hot exhaust for extra thrust
     part:  #gas_turbine__gasturbine  turbine that converts the chemical energy of a liquid fuel into mechanical energy by internal combustion; gaseous products of the fuel (which is burned in compressed air) are expanded through a turbine

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