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#5
January 23rd 06, 07:55 PM
posted to rec.aviation.homebuilt,rec.aviation.owning
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O-320 3.5 crank speed vibration
I am unaware of anything within a 4 cyl opposed engine that would
theoretically that would give anything at the 3.5 harmonic. I think you might be looking at a non-linearity in the mount (is it a dynafocal or a straight conical mouint?) or in the transducer(s) mounting. I'd guess the 3.5 order output to be comparatively insignificant compare to the 0.5 harmonic as far as human discomfort is concerned. Do try the prop indexing thing. Let us know the results. Good luck & THX 
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