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The Rotax 912 is a four-cylinder, horizontally opposed, air- and liquid-cooled engine that produces between 80 to 100 horsepower, depending on the variant.
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Rotax 912 – A Trusted Powerhouse for Light Aircraft The Rotax 912 engine is one of the most popular and trusted engines in the world of light aviation. Known for its lightweight construction, impressive fuel efficiency, and reliable four-stroke performance, it has become the engine of choice for pilots, aircraft builders, and flight schools alike. Whether installed in a light sport aircraft (LSA), ultralight, or experimental build, the Rotax 912 continues to set the standard for dependable propulsion. Engine Overview The Rotax 912 is a four-cylinder, horizontally opposed, air- and liquid-cooled engine that produces between 80 to 100 horsepower, depending on the variant. It features dual ignition, dry sump lubrication, and mechanical carburetion or electronic fuel injection, depending on the specific model. This engine is known for its smooth operation, low vibration, and quiet running characteristics, which contribute to a more comfortable flight experience. Common Rotax 912 variants include: ● Rotax 912 UL – 80 hp carbureted version ● Rotax 912 ULS – 100 hp carbureted version ● Rotax 912 iS/iS2 – 100 hp fuel-injected version with electronic engine management Key Benefits and Features 1. Fuel Efficiency One of the key advantages of the Rotax 912 is its low fuel consumption. With average usage of around 15–18 liters per hour, it offers significant savings over larger, more traditional aircraft engines. The engine can also run on unleaded automotive fuel
(MOGAS) or aviation gasoline (AVGAS), giving operators more flexibility and reducing fuel costs. 2. Lightweight Design The compact and lightweight structure of the engine allows for greater payload capacity in small aircraft. This is especially beneficial for ultralight and LSA builders who must carefully manage aircraft weight to meet category requirements. 3. Reliability and Safety Built with aviation-grade materials and a reputation for long-term durability, the Rotax 912 offers a Time Between Overhaul (TBO) of up to 2,000 hours. The dual ignition system provides redundancy and smoother combustion, enhancing both safety and performance. 4. Low Maintenance Requirements The engine is designed for ease of maintenance, with widely available parts and a strong global support network. Operators can access service and parts through Rotax-certified dealers in most regions worldwide. 5. Quiet and Smooth Operation Compared to two-stroke engines or older piston engines, the Rotax 912 is significantly quieter, contributing to less fatigue on long flights and lower noise pollution in populated or sensitive areas. Common Applications The Rotax 912 is widely used in: ● Light Sport Aircraft (LSA) ● Ultralight and Microlight Aircraft ● Gyrocopters ● Powered Gliders ● Experimental and Amateur-Built Aircraft ● UAVs and special-purpose aircraft Its versatility has made it a go-to engine across various aviation segments. The balance of power, efficiency, and reliability makes it suitable for both professional training environments and recreational flying.
Performance in the Field Flight schools appreciate the Rotax 912 for its economical operation and ease of instruction. Students can focus on learning essential flight skills without being distracted by mechanical issues or excessive vibration. Aircraft builders and hobbyists value the engine’s ease of installation, detailed manuals, and long service intervals. Conclusion The Rotax 912 continues to be a leader in light aircraft propulsion. With a proven track record, low operational costs, and solid engineering, it remains a smart choice for pilots and operators who demand reliability without compromise. Whether you’re flying for fun, training the next generation of aviators, or building your own aircraft, the Rotax 912 is a powerful and practical solution you can count on.
