Walt
Well Known Member
Did my first RV12 prop balance today on Petes very nice RV12. One thing I wasn't prepared for was I needed some metric hardware to attach my vibration pick-up to the engine so we had to go on a hardware hunt before we could even get started. But other than that the process went very well and we were able to reduce Pete's vibration from an intial of .563 IPS to a final of .039 IPS, a SIGNIFICANT reduction.
Keep in mind .2 IPS is considered the upper limit (the red circle in the polar plot below) so our intial reading of .563 IPS was almost 3 TIMES the upper limit. The final number of .039 IPS is less than half the "after balance" limit of .1 IPS and I was very pleased with how it went. We attached the weights (18 grams) to the spinner bulkhead as we usually do with certified aircraft at a single bolt location.
Thanks Pete for giving me an opportunity to work on your aircraft and I hope you enjoy the smoother ride![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
We also did an engine vibration survey (and all looks good there)...
Keep in mind .2 IPS is considered the upper limit (the red circle in the polar plot below) so our intial reading of .563 IPS was almost 3 TIMES the upper limit. The final number of .039 IPS is less than half the "after balance" limit of .1 IPS and I was very pleased with how it went. We attached the weights (18 grams) to the spinner bulkhead as we usually do with certified aircraft at a single bolt location.
Thanks Pete for giving me an opportunity to work on your aircraft and I hope you enjoy the smoother ride
![vibs.png](/proxy.php?image=https%3A%2F%2Flh3.googleusercontent.com%2F_4Z_CncVWCT8%2FTZuOu4Nc-sI%2FAAAAAAAAA58%2FvxcZd49SgvE%2Fs800%2Fvibs.png&hash=7bb479a61e010ac1c10fcc4069b86301)
We also did an engine vibration survey (and all looks good there)...
![vibs2.png](/proxy.php?image=https%3A%2F%2Flh4.googleusercontent.com%2F_4Z_CncVWCT8%2FTZuOu0VxCvI%2FAAAAAAAAA54%2Fr51VqHES1N0%2Fs800%2Fvibs2.png&hash=1d3e44a822e35c0ee707f65e6482c798)
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