From Lockwood
"While both engines have an overload clutch, they have different dog hubs. The ULS has what’s called a 30° hub. If you lock the crankshaft, there is still 30° freedom of movement on the propeller shaft. That is what you’re measuring on the friction torque test. The iS has what’s called a 0° hub. If you lock the crankshaft, there is no freedom of movement on the propeller shaft. There is, therefore, no friction torque to measure and, hence, no specification for it in the 912iS manuals."