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I happen to read an article from Kitplanes Magazine (September, 1997) regarding dynamic propeller/engine balancing and thought the following data would be of interest to some of you:

            Propeller/Engine Vibration Level Table

        IPS (inch/sec)                      Classification
        0.8 or Greater                       Dangerous
        0.4  -  0.8                             Rough
        0.2  -  0.4                             Moderately Rough
        0.1  -  0.2                             Fair
        0.1 or Less                          Smooth

As I mentioned before, my vibration level was reduced from Rough (0.45ips) to Smooth (0.08 ips).  Having flown N360ZR a couple of more hours after the balancing procedure was done just reinforces my initially findings, a much smoother aircraft all together!  Highly recommended.

Rick Argente
N360ZR

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