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.

Key Features of the ROTAX 912 ULS:

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, allowing the propeller to operate at optimal RPM while the engine runs at higher RPM.

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 (European Union Aviation Safety Agency) and FAA (Federal Aviation Administration) for use in light sport and ultralight aircraft.

Applications:

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

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

Advantages:

• Fuel Efficiency: Optimized for low fuel consumption, making it cost-effective for recreational flying.
• Reliability: Proven track record with thousands of engines in operation worldwide.
• Ease of Maintenance: Designed for straightforward maintenance and inspection.
• Versatility: Can run on both automotive gasoline and avgas, providing flexibility in fuel choice

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.

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WEIGHT kg lb Engine with propeller speed reduction gearbox i = 2.43 64.0 140.8 Exhaust system 4.0 8.8 Engine suspension frame 2.0 3.7 Overload clutch 1.7 3.7 External alternator 3.0 6.6 PERFORMANCE 84.8 kW 115 hp 5800 1/min TORQUE 144 Nm 106 ft. lb. 4900 1/min Max RPM 5800 1/min BORE 79.5 mm 3.13 in STROKE 61.0 mm 2.4 in DISPLACEMENT 1211.2 cm³ 73.91 cu inWEIGHT kg lb Engine with propeller speed reduction gearbox i = 2.43 64.0 140.8 Exhaust system 4.0 8.8 Engine suspension frame 2.0 3.7 Overload clutch 1.7 3.7 External alternator 3.0 6.6 PERFORMANCE 84.8 kW 115 hp 5800 1/min TORQUE 144 Nm 106 ft. lb. 4900 1/min Max RPM 5800 1/min BORE 79.5 mm 3.13 in STROKE 61.0 mm 2.4 in DISPLACEMENT 1211.2 cm³ 73.91 cu in