Rotax 912 ULS/S

100 hp

In comparison to the 80 hp version of the Rotax 912 series the 100 hp product line offers more power while keeping the same weight. This engine series offers a time between overhauls of 2,000 hrs and the best power to weight ratio in its class ‒ no surprise that this engine is the best selling 4-stroke aircraft engine.

Configure your preferred engine with the new Rotax Configuration Tool: 



DON'T SETTLE FOR LESS. Original Rotax Genuine Parts. 


This series is available as non-certified (Rotax 912 ULS) and certified engine (Rotax 912 S) according to FAR 33.


  • 4-cylinder
  • 4-stroke liquid-/air-cooled engine with opposed cylinders
  • Dry sump forced lubrication with separate oil tank, automatic adjustment by hydraulic valve tappet
  • 2 carburetors
  • Mechanical fuel pump
  • Dual electronic ignition
  • Electric starter
  • Propeller speed reduction unit
  • Air intake system


Weight kg lb
Engine with propeller speed reduction unit i = 2.43 56.6 124.5
Overload clutch 1.7 3.7
Exhaust system 4.0 8.8
External alternator 3.0 6.6
Engine mount 2.0 4.4
Air guide hood 0.4 0.8



73.5 kW 100 hp 5800 1/min
128 Nm 94 ft. lb. 5100 1/min
MAX RPM* 5800 1/min


* Limited for max. 5 min.



84.0 mm 3.31 in 61.0 mm 2.4 in
1352 ccm 82.6 cu in min. MON 85 RON 95* min. AKI 91*


* leaded, unleaded, AVGAS 100LL or E10
1) ULS = non-certified
2) S = certified acc. to FAR 33

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