Logo 550sx tail problems?

[Phil777]

Read a old thread about the belt jumping of

Purchased the kit today do I have anything to worry about, if so what should I do

[mkovalcson]

Originally Posted by Phil777

Read a old thread about the belt jumping of

Purchased the kit today do I have anything to worry about, if so what should I do

The new kits have a wider belt bearing in back.

You should be fine.

[Phil777]

Thanks for the info

[maarset]

Yah the new idler bearing is quite good. I just don't see how the belt can get past the idler bearing. Nice tight tolerances. But you still need to keep an eye on your belt tension.

[SMJT]

Originally Posted by maarset

Yah the new idler bearing is quite good. I just don't see how the belt can get past the idler bearing. Nice tight tolerances. But you still need to keep an eye on your belt tension.

Can you explain what you mean by keep an eye on your belt tension?

[maarset]

Originally Posted by SMJT

Can you explain what you mean by keep an eye on your belt tension?

Just stick your finger between the tail case and see how tight your belt it.
You want some deflection. But you don't want to be able to push the belt past the mid point of the boom.

[SMJT]

Originally Posted by maarset

Just stick your finger between the tail case and see how tight your belt it.
You want some deflection. But you don't want to be able to push the belt past the mid point of the boom.

The reason I ask is because my 550sx belt feels quite rough at the moment at the tail pulley end and when I up my headspeed it vibrates quite badly, Is this just a wear in process?

[hemp]

Originally Posted by SMJT

when I up my headspeed it vibrates quite badly, Is this just a wear in process?

It should not vibrate noticeably at any headspeed. Hard to guess what the problem is without more info. What do you mean your belt feels 'rough' at the tail pulley end?

[dbcaster]

My tail was rough with the stock setup as well. The bearing was too tight on the belt causing notchiness as the belt teeth rolled around the pulley. Hopefully that expalination is understandable. To fix it, I ovaled the holes in the tail to take pressure off the belt. If you remove the bearing, does the roughness go away?

[maarset]

Make sure the CF tail cases are perfectly parallel with each other. The tail out put shaft might be binding

[SMJT]

Originally Posted by dbcaster

My tail was rough with the stock setup as well. The bearing was too tight on the belt causing notchiness as the belt teeth rolled around the pulley. Hopefully that expalination is understandable. To fix it, I ovaled the holes in the tail to take pressure off the belt. If you remove the bearing, does the roughness go away?

That is the issue the tensioner is causing the belt to feel rough I will give the oval mod a try and let you all know how I get on

[hemp]

Originally Posted by SMJT

That is the issue the tensioner is causing the belt to feel rough I will give the oval mod a try and let you all know how I get on

It can push too hard on the belt, yes. I'm usually able to adjust it a bit just by pulling up on the bearing/screw assembly while tightening the nut. Be careful loosening that too much - if it removes contact entirely then the anti-static wire won't have continuity with the belt through the bearing.

I've never had tension from the idler bearing cause a noticeable vibration in the tail, but that's not to say it can't happen.

[SMJT]

Originally Posted by hemp

It can push too hard on the belt, yes. I'm usually able to adjust it a bit just by pulling up on the bearing/screw assembly while tightening the nut. Be careful loosening that too much - if it removes contact entirely then the anti-static wire won't have continuity with the belt through the bearing.

I've never had tension from the idler bearing cause a noticeable vibration in the tail, but that's not to say it can't happen.

I will try this first at the moment when I remove all the blades and turn the head by hand it feels really rough

[SMJT]

So I had to oval the hole a bit to lift the tensioner up, it is smoother but not perfect it has only had seven flights so I imagine it will get smoother once the belt stretches.

Thanks for the helpful advice guys I have another question what headspeed is every one running?

[maarset]

2500 INSANE SMACK
.......
.......
1800 Smooth sporty

It really depends on what type of flying you do. It's a light heli and doesn't really need high headspeed

[hemp]

I like it right around 2200 for my flying style, which is fairly intense (fast collective changes) 3D. I think it handles much better at lower headspeed than it does with super high headspeeds.

[raptorz499]

5000 6s lipo hemp??

[hemp]

Originally Posted by raptorz499

5000 6s lipo hemp??

I run 4800mAh and 5500mAh 70C 6S LiPos. When I'm just practicing maneuvers I run lower than that, closer to 2000.

[raptorz499]

Thanks man! Can you share the rest of your setup please?

[volar]

Originally Posted by maarset

Make sure the CF tail cases are perfectly parallel with each other. The tail out put shaft might be binding

Originally Posted by hemp

It can push too hard on the belt, yes. I'm usually able to adjust it a bit just by pulling up on the bearing/screw assembly while tightening the nut. Be careful loosening that too much - if it removes contact entirely then the anti-static wire won't have continuity with the belt through the bearing.

I've never had tension from the idler bearing cause a noticeable vibration in the tail, but that's not to say it can't happen.

Will the speedix tail box resolve this issue ?
Any thought's on the speedix tail box will be appreciated . Thanks.