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 valve tappet
• Dual Capacitor Discharge Ignition (DCDI) with RFI noise suppression
• Two Bing Constant Depression (CD) carburetors
• Mechanically driven diaphragm fuel pump
• Integrated electric starter
• Integrated reduction gearbox, ratio of 2.27:1 or 2.43:1 with optional slipper clutch
• Various liquid and oil radiators available
• Many option available such as: Vacuum pump, external alternator, hydraulic propeller governor
• Operates on automotive fuel with a minimum octane rating of 87 (Canadian standards)
• Time Between Overhauls (TBO): 1500 hours*

  

It produces  81hp at 5,800 rpm (with a 5 minute time limit) and 79hp Max continuous

Among the aircraft that utilize the Rotax 912 series to best effect, the list includes birds like the Diamond Aircraft DA 20, Flight Design CT series, RANS S-7 series, Quicksilver GT-500, and the Progressive Aerodyne SeaRey.

Come Check Out Rotax's Basic Four-Stroke, the Rotax 912 UL, With Aero-TV

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