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04-03-2010 04:18 PM  10 years ago
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zackesch

rrApprentice

Milwaukee, Wisconsin

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Vibrations
I am getting some vibrations, but i don't know where its coming from. I checked the main shaft and spindle shaft, and both are straight. I checked them by rolling them on clean glass as i don't have a gauge to check for run out. Any other ideas?
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04-03-2010 04:25 PM  10 years ago
reddragon

rrElite Veteran

Brooklyn, N.Y.

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You must give us a little more information than that.
What helicopter? What engine? Which blades? Etc.
Your blades may not be balanced properly. (?)
Wayne - Fly it like you stole it! You're in good hands with Runryder!
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04-03-2010 04:33 PM  10 years ago
nivlek

rrProfessor

Norfolk England

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It would also help to know what is vibrating - the canopy , the skids , the tail fin etc !At the end of the day , it gets dark .
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04-03-2010 04:33 PM  10 years ago
zackesch

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Milwaukee, Wisconsin

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Im sorry for the lack of info. Its a raven 30 with an older os 30. I am running the stock century wooden blades. I was running it w/o blades due to the fact that i had vibrations last season, but i didn't have the time to hunt it down before snow fell. So I am doing it now.

Without it being in the air, my exhaust deflector is vibrating pretty heavy and i can feel it in the tail boom.
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04-03-2010 10:35 PM  10 years ago
oldfart

rrProfessor

Vancouver, Canada

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1- Running ANY heli without blades (no load) is not recommended.

2 - If you feel it in the boom I would suspect that your tail drive wire-in-tube support assembly has migrated to the front or to the rear.

How had you secured it onmce installed?
Phil
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04-04-2010 12:07 AM  10 years ago
MikeInMobile

rrElite Veteran

Mobile, Alabama

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The tail blades may be out of balance. If the issue emerged all of a sudden, check the tail blades for nicks.

As far as checking the main shaft and feathering shaft, do not use a piece of glass, use a mirror instead. The error will be doubled, making the bend a lot easier to see.

If you have a high point balancer, check the head and tail assemblies for balance, making corrections as required to achieve a perfect balance.

OldFart is absolutely correct about running the machine without main blades! As far as his other observation, vibration in the boom is not always an indication of an imbalance in the boom/drive assembly. If the exhaust deflector is vibrating, the source of the vibration may be excessive wear in the engine. Look at the exhaust deflector at idle for vibrations. If there is little or no vibration, you can generally rule out the engine being worn out!
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