title: Ivchenko AI-9
text: # 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)
  