The Stratos is powered by the highly efficient Pratt & Whitney Canada JT15D-5:

EEC (Electronic Engine Control) system with hydromechanical back-up: ease of pilot workload.
Efficiency: single engine turbine reduces operating cost significantly.
Reliability: more than 6,600 engines produced having accumulated more than 41 million hours of flight time.
Confidence: supported by P&WC's industry-leading global customer support.