ROTAX 912 ULS/S

In comparison to the 80 hp version of the Rotax 912 series the 100 hp product line offers more power while keeping the same weight. This engine series offers a time between overhauls of 2,000 hrs and the best power to weight ratio in its class ‒ no surprise that this engine is the best selling 4-stroke aircraft engine.
 
This series is available as non-certified (Rotax 912 ULS) and certified engine (Rotax 912 S) according to FAR 33.