Tue, Oct 21, 2008
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.
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