Installation Manual, 61-00-00
Rotax 912 Installation Manual Chapter 61-00-00, Propeller Drive,
Bottom of Page 2
WARNING
"...............................................................Never fit the propeller directly on the crankshaft."
A friend contacted me, seeking clarification, about this rather bald statement.
I advised that, despite its its ambiguity, it just means do not attach a prop directly to the engine crankshaft (who would even try ?) i.e. you can only attach a prop/hub to the gear box flange incorporated there on.
Am I correct??