• Source: Ivchenko AI-9

      • The Ivchenko AI-9 is an aircraft auxiliary power unit developed and produced by Ivchenko-Progress and Motor Sich.


      Variants


      AI-9
      The base model which is used to supply compressed air to air-start systems. It can also be used as cabin heating if necessary.
      AI-9V
      A variant of the base model that is used to supply compressed air to air-start systems and air conditioning. It also supplies electricity to on-board electrical systems with a 3 kW generator.
      AI9-3B
      The AI9-3B is used to provide air to engines and air conditioning systems and provide electricity to on-board electrical systems.


      Specifications (AI-9)


      Data from Aircraft engines of the World 1970


      General characteristics


      Type: Auxiliary Power Unit (APU)
      Length: 740 mm (29 in)
      Diameter: 500 mm (20 in) casing diameter
      Dry weight: 45 kg (99 lb)


      Components


      Compressor: 1-stage centrifugal compressor
      Combustors: Annular combustion chamber with 6 fuel injectors
      Turbine: 1-stage axial turbine (gas generator)
      Fuel type: Aviation Kerosene such as JP-4


      Performance


      Maximum power output: 56 kW (75 hp) (air hp) at 38,500 rpm or 0.4 kg/s (53 lb/min) of compressed air at 2.4 bar (35 psi)
      Overall pressure ratio: 2.8:1
      Air mass flow: 1.5 kg/s (200 lb/min) at 38,500 rpm
      Fuel consumption: 120 kg/h (260 lb/h) maximum
      Power-to-weight ratio: 1.23 kW/kg (0.75 hp/lb) (air hp)


      References

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