mtv wrote:Battson,
What engine/prop do you have? On Lycoming O 360s with constant speed props, I've been told that 12/6 is the only APPROVED indexing, but that is not correct. That is specific to a couple aircraft models, and even those are approved at 10/4 in the TC.
The only issue with these engines and Hartzell CS props is that you have to press out and re install the prop bushings. Some mechanics figure that's a PITA so they'll tell you it's not legal to change the indexing......hogwash, find a better mechanic.
I've been told by some folks that the 12/6 indexing reduces vibration......and that too is hogwash. At one point, our mech didn't want to re index for this reason. We had a vibration survey done, with the prop in each indexing. Turned out the vibration could easily be made the same by simple balancing.
It looks like you're experimental, in which case, do what you like.
And, yes, I've hand propped engines with "starter assist", and it can be easier. No more risk of getting your hand whacked as compared to just propping it.
MTV
This is the IO-540-A4, I have the MacCauley C235 prop with the integrated bushings which only fit onto the flange in two directions. I didn't realise that I could press those out. Although hand propping wasn't a main concern when I first installed it.