My mechanic just put stick on wheel balance weights on the backing plate flange. Haven?t moved in 300 hrs.
Jack
I'm having my prop dynamically balanced. The initial feedback from the person doing the job is that he'd have to drill the spinner bulkhead to install weights. Is this what others have done? Can anyone share pics of how their weights are mounted?
thanks!
Just had this done for a second time due to having hub half being replaced and experiencing vibrations. Recommend everyone get this done. This time around Dave got it to .1 and boy is it smooth running. Jane now has 948hrs and gearbox inspection is coming up at 1000 hrs will see the results on the gears.
My goal is 0.05 IPS or better when balancing, .01 is seldom obtainable on professional balancing equipment.
Hopefully you mean .01
.1 is not horribly bad but when paying a professional do it, they should be able to get it very close to .01.
BTW, the acceleration value that is considered noticeable is .07 or higher (not .7)
Walt, what brand do you use? 2 accelerometers 1 front, 1 rear?
This just seems like such a good idea, I wonder why more people don't do this? Not to mention it's at the outside of the spinner bulkhead, has 14 positions on my spinner, and will eliminate the need to remove and re-install the spinner each time you do a run.Not telling you what to do, but I just use longer screws on the backplate perimeter. An oversize nut is a convenient shim/weight to clear the nutplate, and then nut/washer(s) as needed.
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Charlie
Thanks Ray - looking at my Hartzell manual it says to put the weights on the spinner bulkhead, outside of the doubler and inboard the flange. Looks like that's what I'll do!These are the sources of information I reference when balancing propellers. I use a Dyna Vibe GX3 so the equipment in these publications is different but the principles are the same and the mounting of balance weight are best practices.
For your reading pleasure google the following 3 publications:
FAA Advisory Circular 20-37E - Aircraft Propeller Maintenance
The following is a quote from the above AC and both use best practices according to the FAA.
"When approved aircraft or propeller manufacturer’s procedures are not available, there are other acceptable dynamic propeller balancing procedures. These include, but are not limited to the Chadwick-Helmuth Publication No. AW-9511-2, entitled “The Smooth Propeller”, and ACES Publication No. 100-OM-01, entitled “ACES Systems Guide to Propeller Balancing”. "
Of course, if you fly an experimental you are free to "experiment"
.07 ips is considered balanced. Really the only way to tell the difference between .01 and .07 ips is by using pro-grade balancing equipment.
The flywheel holes are an approved location for Lycoming.
BTW this thread is like 3 yrs old...