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Rotax's Basic Four-Stroke Is A Solid Performer In The Sport Aviation World

At the US Sport Aviation Expo, Aero-TV caught up with an old friend, Eric Tucker... a guy who is known worldwide as "Mr. Rotax." The most well-known (and easily the hardest working) expert on the Rotax 900 series sport and certified engines, Eric took a few minutes to help us profile each of the amazingly compact, powerful and fuel-efficient 900 series engines, this time concentrating on the 81 HP Rotax 912 UL.

With a dry weight of 121.2 pounds, the Rotax 912 UL DCDI 81HP engine is a 4-stroke engine specially developed for recreational aircraft. It also exists in a certified version as the Rotax 912 A and Rotax 912 F.

Additional features include:

4 horizontally opposed cylinders, "boxer" configuration
Free air cooled cylinders, liquid cooled cylinder heads with integrated pump and expansion tank
Dry sump forced lubrication with integrated pump and separate oil tank
8 valves, automatic adjustment by hydraulic ...