The ROTAX 912 ULS is a popular four-stroke, horizontally opposed, four-cylinder aircraft engine manufactured by BRP-Rotax. It is widely used in light sport aircraft (LSA), ultralights, and other small aircraft due to its reliability, efficiency, and relatively low maintenance requirements.

• Engine Type: Four-stroke, horizontally opposed (flat-four) configuration. Air-cooled cylinders with liquid-cooled cylinder heads.
• Displacement: 1,211 cc (74 cubic inches).
• Power Output: 100 hp (74.6 kW) at 5,800 RPM.
• Fuel System: Dual carburetors (Bing 64/32/60 or 64/32/80). Designed to run on unleaded automotive gasoline (91+ octane) or 100LL avgas.
• Weight: Dry weight: Approximately 135 lbs (61.2 kg).
• Reduction Gearbox: Integrated gearbox with a reduction ratio of 2.43:1 or 2.27:1.
• Lubrication System: Dry sump lubrication system with an external oil tank.
• Ignition System: Dual independent electronic ignition systems for redundancy.
• Cooling System: Cylinder heads are liquid-cooled, while the cylinders are air-cooled.
• Propeller Drive: Flange-mounted propeller hub.
• Certifications: Certified under EASA and FAA for use in light sport and ultralight aircraft.

The ROTAX 912 ULS is commonly used in aircraft such as:

• Light Sport Aircraft (LSA): Flight Design CTLS, Tecnam P2008, Evektor SportStar
• Ultralights and Microlights: Quicksilver GT500, Aeroprakt A22
• Experimental and Homebuilt Aircraft: Van's RV-12, Zenith CH 750

• Fuel Efficiency: Optimized for low fuel consumption
• Reliability: Proven track record with thousands of engines in operation
• Ease of Maintenance: Designed for straightforward maintenance and inspection
• Versatility: Can run on both automotive gasoline and avgas

The ROTAX 912 ULS is a cornerstone of the light aviation industry, offering a balance of power, reliability, and efficiency for a wide range of aircraft.