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
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ROTAX 912 IS/ULS Aircraft Engine Series Images
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