Friction Torque direction query
Hi Rotax owners,
When conducting a friction torque check on a Rotax 912 series engine I note the Rotax line maintenance manual (Revision 1 Ed 04 / July 01 2021) shows a diagram in section 12-20-00 (figure 7.33) shows the torque gauge pulling the propeller in a anti clockwise direction (in the normal direction of engine/prop rotation).
And the video published on the Rotax Owners forum for the friction torque procedure shows the measurement being taken in the clockwise direction and the audio voice over also mentions to go this way (shows pulling the opposite direction)
My basic understanding of the clutch/ramp design has me thinking it should not make any diffrence and the spring pack pressure should not alter depending on rotation against the dogs.
Just wondering if when moving the prop through the measurement range for the friction torque measurment if the direction of rotation is critical?
The line maintenance manual shows one direction and the very helpful video shows the other!
Regards,
Byron.