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Home✈️Aircraft🚁HelicopterAlignOther › Got the shakes!
08-02-2007 10:00 AM  13 years ago
Filby

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Adelaide, South Australia

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I did balance the whole unit that is connected to the motor shaft. No noticeable change. Even took the fan completely off to see if that made any difference.
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08-02-2007 10:27 AM  13 years ago
dazzaster

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right next door to hell

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is the baring in the on the torque tube slightly of centre. if not it should be but if its way of centre this would cause vibes.
also is the fan hub connected firmly to the engine crank shaft as i found mine had come loose.
darren
A.K.A 509
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08-02-2007 10:31 AM  13 years ago
Filby

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Adelaide, South Australia

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Im running belt not TT. The hub is most deffinitely well connected. Its come off about 10 times over the past week with me trying to find the source of the problem!
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08-04-2007 02:19 AM  13 years ago
Filby

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Adelaide, South Australia

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Though not exactly sure what has fixed it but the vibe is gone!

I spent the morning fully pulling it apart. I did the following things:

- Pulled out the tail and boom, removed the landing gear and bottom frame, took out the fuel tank and took the head off. This was so I could check the alignment of the frames on a piece of glass. No matter how I twisted things the rear left bottom of the frame would pull up when I tightened the screws that hold the main shaft bearing blocks. I got it as close to level as I could and then tightened everything back up again.
- Tightened the tail belt. I don't think this has done anything but was on the list of things still to check.
- Tightened the clutch hub down onto the engine. I noticed that there was about a 0.5mm end play that wasnt being tightened up when I put the nut on. I made sure that this was taken up before putting the engine back in.

After doing this I noticed that there was no slop in the main shaft anymore. This, and the re-alignment of the frames are what I believe fixed the vibration problem. The heli now goes all the way to 2100rpm without any vibration and sits in the hover beautifully!
Thanks go out to everyone who has given me suggestions over the past week!

Cheers,

Fil
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08-04-2007 03:09 AM  13 years ago
Nashville

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Formerly Music City now back home in Sunny Florida

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Mission completion. Way to go!I was Spektrum when Spektrum wasn't cool
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08-04-2007 04:40 AM  13 years ago
MJWS

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Airdrie, AB - Canada

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Glad to hear you got it. Right on.

Mike
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08-05-2007 08:17 AM  13 years ago
Filby

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Adelaide, South Australia

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Just an update.

Today I went down to the local club and a mate there who also owns a new 600N was having worse high freq vibes than I was! The heli was really buzzing to the point that it was unflyable. Anyway I spent 15mins on the bench with it where I pulled out the main shaft bearings, made sure that the A's and B's were facing the right way up, stuck in the main shaft, spun it around, tightened everything back up and voila! no more vibes! This confirms my thoughts that it was the main shaft bearings causing the vibration.

Cheers

Fil
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