The Rotax 912 iS is a modern four-stroke aircraft engine and is part of the popular 912 series, which has become the standard engine for light aircraft, microlights, gyroplanes, and UAVs worldwide. The 912 iS model represents an evolution of the classic 912 ULS engine, with a strong focus on fuel efficiency, electronic management, and reduced emissions.
The engine features four cylinders, is liquid- and air-cooled, and has a displacement of 1352 cm³. It produces 100 horsepower (73.5 kW) at 5800 RPM and uses a reduction gearbox to optimize propeller speed relative to engine speed.
Electronic fuel injection
One of the most significant technological improvements in the 912 iS is its electronic fuel injection system (the “iS” stands for “injection system”), which replaces traditional carburetors and provides precise control of the air-fuel mixture. This results in lower fuel consumption, cleaner combustion, and smoother engine operation.
Low consumption
Fuel economy is one of the engine’s greatest strengths. In cruise flight, fuel consumption is typically around 15–18 liters per hour, depending on load and aircraft type. The 912 iS can run on both AVGAS 100LL and unleaded automotive gasoline (MOGAS), offering flexibility and lower operating costs.
The electronic engine control system, ECU (Engine Control Unit), continuously monitors sensors for pressure, temperature, and RPM, and automatically adjusts mixture and ignition timing to ensure optimal performance under all conditions.
Reliable
The engine is also known for its reliability and long service life. The TBO (Time Between Overhaul) is typically 2000 hours, which is high for this class of engines. In addition, it is compact and lightweight (around 63 kg dry weight), making it ideal for small aircraft where weight is critical. The 912 iS has been used in a wide range of aircraft.
With the 912 iS, Rotax has demonstrated how modern technology can enhance small aircraft engines through digital control, lower emissions, and higher efficiency.
The engine combines the proven mechanical reliability of earlier Rotax models with the electronic precision found in today’s automotive engines. This makes it a preferred choice for both manufacturers and private pilots seeking a modern, economical, and environmentally friendly powerplant solution.
