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  #11  
Old 07-16-2017, 05:48 AM
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rjcthree rjcthree is offline
 
Join Date: Jan 2007
Location: Bay Village, OH
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Default 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.
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Last edited by rjcthree : 07-16-2017 at 05:51 PM. Reason: grammar
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  #12  
Old 07-16-2017, 08:58 AM
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Snowflake Snowflake is offline
 
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Location: Victoria, BC, Canada
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Default

Well, here's another anecdotal piece of "evidence". When I bought my RV-6 the prop was clocked to stop vertically. After flying with it that way for a couple of years, I was talked into changing it to the 10:30/2:30 clocking that "everyone else has". It felt different afterwards, but I don't know that i'd say it was smoother or rougher overall.

It's still clocked there four years later, but I did balance it down to .020 IPS early this year. That made a difference I could feel in my butt while flying.
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  #13  
Old 07-16-2017, 09:08 AM
rv7charlie rv7charlie is online now
 
Join Date: May 2006
Location: Pocahontas MS
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At least for me, talking about where the prop stops is very imprecise language. I've had at least one engine that frequently stopped somewhere near TDC.

Where's the prop with cyl #1 @ TDC? I would think that's the important data point, for this discussion.

Charlie
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