Rotax 912 i series Operator's Manual page 78

7.5) Propeller gearbox
Reduction ratio
Torsional shock
absorber
Governor
Effectivity: 912 i Series
OM Edition 1/Rev. 0
For the engine type 912 iSc/iS one reduction ratio is available.
Reduction ratio
crankshaft: propeller shaft
The design incorporates a torsional shock absorber. The shock
absorbing is based on progressive torsional cushioning due to axi-
al spring load acting on a dog hub.
Alternatively a hydraulic governor for constant speed propeller
can be used. The drive is via the propeller reduction gear.
BRP-Powertrain
912 iSc/iS
2.43:1
January 01/2012
page 7-12