500 tail jitter help

[jimmyo]

I have a tail jitter on my rex 500 im using a 401 and a 9254 servo and no matter wot I do I cannot seem to stop it ? does any one have any Ideas ?

[JeromeF]

Can you elaborate a little more on what you mean by jitter?

[jimmyo]

yer its like a fast vibe on the tail it wont settle appears to jitter ?
its not like a gyro wag its seems to fast for that ?
best I can say really ive never come across it before
HELP lol

[Tim Procter]

Sounds like your tail rotor shaft is bent mate, Spin the main rotor by hand and watch very closly at the tail rotor shaft for the slightest wobble (or bend in the shaft)

If thats not the case then replace main shaft and feathering shaft.

The very slightest bend (often unseen by the human eye) in any one of these will cause a vibration like that.

[Smoothound]

To be honest mine does something very similar and I've never got to the bottom of it. Checked all shafts when I built mine as I always do, never been crashed and it has this annoying tail that just don't look like wag as such. It's not bad enough to make it a pain just annoying

[Tim Procter]

Unless he is talking about the known 500 low headspeed wag before it gets up to speed Phil.

In which case take the dampers out and lubricate with silicone grease making sure the dampers arnt knackered at the same time.

Both my 500s did the same until rectified by this method.

[Smoothound]

Could be lack of lube I guess, my HS is fine on both 5s and 6s. i'm now being told its something to do with the thrust races on the tail locking up

[Tim Procter]

Must admit, I havent heard of that before.

[Smoothound]

I think it used to happen on the 600 but never did on mine

[Tim Procter]

I think it used to happen on the 600 but never did on mine

I mean the bearings could be on there way out causing this as new as it is..

Without inspection its hard to tell.

[Smoothound]

Yeah it's a bit bloody annoying if it is them. More user beta testing for Align

[raptorheli2]

i had this guys, turned out to be bearings.

VERY annoying so i put a blog up. this may or may not be the same problem but i tried everything else.

http://www.trextuning.com/blog/?p=382

cheers

[Smoothound]

Cheers Paul someone else just MSN'd me the link as well

[Tim Procter]

Thanks Paul, Could save hours of searching..

[Smoothound]

So what was the reasoning behind swapping the thrusts out for radials rather than just fitting better quality thrusts? Knowing the quality of std Align bearings I thought this would have been an option?