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Originally Posted by Russ McCutcheon
Lee, the fellow that built my RV-4 said he could not keep the exhaust on tell he got a decent prop=less vibration, I bet you have a good prop already though, has it been dynamically balanced?
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No, the prop has never been dynamically balanced. I found a guy who does it in ON (or rather he found me, after reading my tale of woe), and I plan to get that done soon after OSH.
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Next idea, once when flying formation with a local RV driver, taking a look at his belly revealed his exhaust stacks vibrating in a circle about twice the size of the pipe, told him about it and had him raise and also lower his RPM, 50 RPM either side would result in rock steady pipes. You could try running at a different RPM.
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Hmm. Sounds like I need to organize a formation flight. I bet I can talk Glenn C. into that with his RV-7A.
I also got an email from Larry Vetterman. He suggested I might want to try a different configuration exhaust system to see if that helps. I've got a crossover system now, but a four into one, or a four pipe system are also possibilities. I wonder how many of these types are in service, and what their service history is.
Thanks for the ideas.