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  1. #1

    Join Date
    Feb 2002
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    Ft Worth, TX
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    EVO 90 VIBRATIONS

    I have a Pettyr nasty vibration that has me nuts trying to isolate it. it is mostly noticible at the tail boom & vertical fin but the whole machine shakes. The tail boom is actually vibrating up & down but when your looking at the vertical fin it has a noticeable side to side vibration.

    This is what I have already tried Checked the tail rotor shaft for end play. Found none. Checked balance of blades. good, changed main shaft and hub,swapped out the belt, tighten every nut & bolt on the head & finally checked the phasing.

    does anyone have any suggestions!!!

    thanks in advance
    Santonomos

  2. #2
    machdiamond's Avatar
    Join Date
    May 2008
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    Benoni, SOUTH AFRICA
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    RE: EVO 90 VIBRATIONS

    I had the same thing on my maiden flight and the first advice I was given was to pull those dampers out and oil them! The manual does hint at this but let me tell you, soak those buggers in car engine oil and stick em in while still dripping with oil. It is suggested that you do this once every two weeks or so because they dry out with use. It fixed my ship right up, and I was relieved cause the only other thing is a misaligned flywheel/clutch/shaft assembly which is real critical. Mine was well within the given tolerance but the thing shook like crazy. Now that's part of my regular maintenance and after about 25 litres of fuel the shakes still haven't come back...
    lest the earth come up and smite thee

  3. #3

    Join Date
    Jan 2007
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    RE: EVO 90 VIBRATIONS

    I had vibration due to bad engine tuning.


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