The Turbomeca Artouste is an early French
turboshaft engine, first run in 1947. Originally conceived as an
auxiliary power unit (APU), it was soon adapted to aircraft propulsion, and found a niche as a powerplant for turboshaft-driven helicopters in the 1950s. Artoustes were licence-built by
Bristol Siddeley (formerly
Blackburn) in the UK,
Hindustan Aeronautics Limited in India, and developed by
Continental CAE in the US as the
Continental T51. Two major versions of the Artouste were produced. The Artouste II family, mainly used in the
Aérospatiale Alouette II helicopter, had a one-stage centrifugal compressor and a two-stage turbine, with gearbox-limited power of 300 kW (400 hp). The Artouste III family, mainly used in Aérospatiale's
Alouette III and
Lama helicopters, had a two-stage axial-centrifugal compressor and a three-stage turbine, with gearbox-limited power of 420–440 kW (560–590 hp).