One more qualitative data point: Clocking. 11/5 vs 9/3
First, clarifying my positional description: clock face reference is facing the a/c, 16h into phase 1. Prop was mounted 11/5 with #1 at TDC. As RPM climbed, a discernible vibe was felt. Changed to 9/3 today with #1 at TDC, and noticed a significant reduction in vibration via the butt-o-meter, ground runs only. It stops in an awkward place, near vertical, but I can deal with that.
The 25 year experienced IA that was finishing up my bleed down thought it was an odd mounting, but his comments seem to come back to safe hand propping. We'll balance it in the next couple weeks, I'll amend this then with data, and once we get to flying.
RV-9A tip-up, O320H2, Ellison, Dynon D180
First Flight 2017apr23 - Phase 1 is dragging....
2011-2018 VAF contributor
Dog is my copilot, rest in peace 2015APR28. I miss that dog.
Last edited by rjcthree : 07-16-2017 at 05:51 PM.