Prop clocking

[PA1195]

Re: Prop clocking

Review these. If there's access to a prop balancer that generates a plot of vibes vs rpm then it would be interesting to note any real measured changes or benefits by re-indexing. The rough start-up mentioned will be worth looking for:

https://groups.google.com/forum/#!topic/rec.aviation.homebuilt/5vp2oGDiEKE

https://www.lycoming.com/sites/default/files/SI1098K%20Propeller%20Flange%20Bushing%20Location.pdf

Gary

[astjp2]

Re: Prop clocking

I have propped a Comanche set at 9/3 and it sucked, put it at 11 and he done with it, you may have to prop and it's the safest position to start from. Tim

[SpecialT]

Re: Prop clocking

Ok, you know it's been a while when you forget your password and need to request a reset...

So I've been flying the prop clocked at every available angle and the 11'oclock is the best. The 9-3 made it buzz (slight roughness) at most rpms over 2k, the current position with the prop at 11'oclock but with the #1 blade pointing down (180 deg out) seems to be the best for my current set up. I know these Lyc's are not sewing machines, and certainly not paint shakers, but if I ever rebuild one I'm going to balance everything. I thought for sure the 9-3 position was it, but I guess the precession forces have better ideas and Lycoming was right.

[astjp2]

Re: Prop clocking

Ok, you know it's been a while when you forget your password and need to request a reset...

So I've been flying the prop clocked at every available angle and the 11'oclock is the best. The 9-3 made it buzz (slight roughness) at most rpms over 2k, the current position with the prop at 11'oclock but with the #1 blade pointing down (180 deg out) seems to be the best for my current set up. I know these Lyc's are not sewing machines, and certainly not paint shakers, but if I ever rebuild one I'm going to balance everything. I thought for sure the 9-3 position was it, but I guess the precession forces have better ideas and Lycoming was right.

Yep, what I said earlier...11:00