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#7
January 23rd 06, 08:34 PM
posted to rec.aviation.homebuilt,rec.aviation.owning
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O-320 3.5 crank speed vibration
Checking the transducer mounting is a good idea even if it only
removes another unknown from the equation - Maybe your xdcr mount is resonant at the 3.5 harmonic? Change the RPM & see what the measurments show. What's nagging at me is the magnitude of the 3.5 order vibration. 0.5 IPS equates to quite a lot of acceleration at that frequency Its still only 1/4 g approx. Not that much for a piece of cheap machinery.......! 
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