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#11
January 23rd 06, 09:48 PM
posted to rec.aviation.homebuilt,rec.aviation.owning
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O-320 3.5 crank speed vibration
Its kinda interesting to critically watch the rotational plane of a
brightly lit (daylight) propeller against a dark background, as someone else varies the engine RPMs. I've seen the blade tips move like 1/2 inch out of plane at certain bad rpms. 
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#12
January 23rd 06, 10:13 PM
posted to rec.aviation.homebuilt,rec.aviation.owning
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O-320 3.5 crank speed vibration
nrp wrote:
Its kinda interesting to critically watch the rotational plane of a brightly lit (daylight) propeller against a dark background, as someone else varies the engine RPMs. I've seen the blade tips move like 1/2 inch out of plane at certain bad rpms. Or a variable speed party strobe... Sheds an interesting light on things like that. Richard
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#13
January 23rd 06, 10:14 PM
posted to rec.aviation.homebuilt,rec.aviation.owning
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O-320 3.5 crank speed vibration
Possible reasons for out of balance are
propeller static balance bad or engine mounts bad.
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