The Rotax 915 iS is a four-cylinder
four-stroke,
horizontally-opposed,
turbocharged, air and liquid-cooled, gasoline engine design, with a mechanical gearbox
reduction drive. The turbocharger has a compression ratio of 3.5:1 and the engine will have a critical altitude of . It employs dual electronically controlled fuel injection, using dual channel
Rockwell Collins ECUs, with dual ignition and produces for take-off and continuous. The engine can produce rated power up to and has a ceiling of . In December 2021 the option to replace the 12V electrical system with a 24V one was introduced. The 24V version of the engine is designated the 915iS C24 for the non-certified version and the 915iSc C24 certified version. ==Variants==