The AI-450S is a turboprop engine designed by Ivchenko-Progress and manufactured by Motor Sich. It is a two-shaft design with one gas generator shaft and one free turbine shaft. The 450 hp AI-450S is used on the Diamond DA50-JP7 and Diamond Dart 450 and the 630 hp AI-450S-2 is used on the Evektor EV-55.
References
Ivchenko-Progress Motor Sich AI-450S Wikipedia(Text) CC BY-SA