Ivchenko AI-9
# 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)
