Acceptable amount of vibrations??

[Eckchaz]

Hi,

Been searching on here and Helifreak but to no avail...

The 600 is my first Nitro and though i've had some good and some bad days with her, theres a few things thats bugging me..

The only thing I have not done is balance the Clutch/fan assembly as I dont have to tools to do so... now the tail fin vibrates so much at the bottom tip that it looks blurred and both the metal linkage for the tail vibrates badly! However i'm not getting any High Frequency vibes as theres no foaming of the fuel?

What I want to know is how much vibration is normal or acceptable and what things to I need to look or check for/reduce vibrations?

[Mart61]

Watching this thread with interest. Whilst I've not spotted any abnormal or excessive vibes on my 600, I'm not really sure what "normal" is.

[waveydavey]

It shouldn't be a visible amount of vibration would be the answer. If the tail fin is a blurr then it sounds like it's coming from the engine/clutch stack. Low frequency tends to be something to do with the blades etc. I would try and find it Eddie it can be destructive and cause fatigue where you can't see it. Was it there to start with?

[Snowsurfer]

Re: Acceptable amount of vibrations??

My 700 has an identical vibration as your 600 I havnt been able to pinpoint it either!

[Eckchaz]

It shouldn't be a visible amount of vibration would be the answer.

Thats a broad answer Dave? If its not visable, then surely theres none?

Yes mate, It was there from the start but its calmed down after triple checking/sorting everything. Thus mentioning the clutch/fan assembly as the only items not done. I am worried about it causing fatigue and something breaking inflight, so asking the good old members on here for the answer.

I'm not actaully sure what type of balancer I'll be able to use for balancing the clutch/fan?.. The only one I've found is on Midland Heli's by Dubro but I'm actually resenting paying Over £35 for the Dubro one when i'm not sure it'll work? What about his thing JP DELUXE WHEEL/PROP BALANCER (ALUMINIUM) on eBay (end time 22-May-10 22:43:07 BST)? I just keep thinking the grips wont hold the fan dead centre so I'll never get a true balance? Any ideas or suggestions?

[Eckchaz]

My 700 has an identical vibration as your 600 I havnt been able to pinpoint it either!

Have you balanced your fan, Matt?

[Nick B]

Is the 55 tuned properly,its not a shake from being a tad to rich?

[waveydavey]

Thats a broad answer Dave? If its not visable, then surely theres none?

Yes mate, It was there from the start but its calmed down after triple checking/sorting everything. Thus mentioning the clutch/fan assembly as the only items not done. I am worried about it causing fatigue and something breaking inflight, so asking the good old members on here for the answer.

I'm not actaully sure what type of balancer I'll be able to use for balancing the clutch/fan?.. The only one I've found is on Midland Heli's by Dubro but I'm actually resenting paying Over £35 for the Dubro one when i'm not sure it'll work? What about his thing JP DELUXE WHEEL/PROP BALANCER (ALUMINIUM) on eBay (end time 22-May-10 22:43:07 BST)? I just keep thinking the grips wont hold the fan dead centre so I'll never get a true balance? Any ideas or suggestions?

It's a broad answer for good reason, nitros vibrate, period. Some of it isn't enough to be visible to the naked eye and if it's bad enough to see on the tail fin then you need to find it. Does it happen at a particular headspeed, is it whilst spooling up, can you only see it whilst in the hover.

I've never had to balance a clutch assembly I do dial them in though. Try releasing the engine bolts until they are tight enough just to hold the engine in place, whilst tightening them up spin the engine with the plug out using your starter. Tighten the bolts on the diagonal and then try it again.

[lex7919]

Did you leave some end play in the TT when fitting it? if not that can cause resonance in the tail fin ive seen before.

[Eckchaz]

Is the 55 tuned properly,its not a shake from being a tad to rich?

I believe so... finger test about 8 secs.. can hold over ten but gritting teeth!! Also sounds ok but I am still learning!

Dial in? Done a search but cant find a difinative answer Dave, can you elaborate for me please? Thank you

[Eckchaz]

Did you leave some end play in the TT when fitting it? if not that can cause resonance in the tail fin ive seen before.

I did but I could try loosening it up more! Thanks Alex

[lex7919]

I did but I could try loosening it up more! Thanks Alex

Your welcome, you should not need to pull it back far at all though a few mm is plenty

[waveydavey]

You use a dial test indicator to make sure that the fan is concentric and parallel with the hub. Try this link for an explanation.

[lex7919]

Good link!

[Snowsurfer]

Have you balanced your fan, Matt?

No i havnt, similar story to you really i should take the fan and clutch right out and check it.