Fri, Oct 02, 2020
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 100 HP Rotax 912S/ULS.
With a dry weight of 124.7 pounds, the Rotax 912S/ULS DCDI 100HP engine is a 4-stroke engine specially developed for recreational aircraft. It also exists in a certified version as the Rotax 912 S.
Additional features include:
- 4-stroke engine specially developed for recreational aircraft. Also exists in a certified version: Rotax 912 S.
- 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 heavy duty electric starter
- Integrated reduction gearbox, ratio of 2.43:1 with slipper clutch standard
- Various liquid and oil radiators available
- Many options available such as: Vacuum pump, external alternator, hydraulic propeller governor
- Operates on automotive fuel with a minimum octane rating of 91 (Canadian standards)
- Time Between Overhauls (TBO): 1500 hours*
It produces 100 HP at 5,800 rpm.
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/S-19 series, Quicksilver GT-500, and the Progressive Aerodyne SeaRey.
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