Rotax 915 iS


The Rotax 915 iS is an Austrian aircraft engine, produced by Rotax of Gunskirchen for use in ultralight aircraft, homebuilt aircraft, light-sport aircraft, small helicopters and gyroplanes. The engine was type certified in 2017.
The engine was first publicly displayed at AirVenture in July 2015 and first flown in March 2016.
In January 2016 the engine was named AVweb's "Best New Engine" of 2015.

Design and development

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.
The engine is based on the Rotax 912, but differs in that it has fuel injection, a reinforced crankshaft, new pistons, a new gearbox and a turbocharger. Time between overhauls was expected to eventually be raised to 2000 hours with operational experience, but started at 1200 hours.
The design entered production in the second half of 2017. The European Aviation Safety Agency certified the Rotax 915 iSc3 A on 14 December 2017 and the Rotax 915 iSc3 B on 4 January 2018.

Applications