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07-29-2012 06:41 AM  8 years ago
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Timtreo

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Warminster, PA USA

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Tail Belts
I'm having a heck of a time with my 450 EC135. The tail belts keep breaking... I can hear a straining sound when I yaw right but not left. The limits are set correctly and everything slides freely. Tension is not too tight not to loose sort of thing. Can bend one side of the belt 3/4 of the way to touch the other side.
I just put a new motor in it and this time tried a Maveric high strength belt. I also removed the idler pulley. I flew it as a pod and boom for 10 batteries, everything fine. Back in the fuse and not through one battery and the belt breaks.... Could not have asked for a better crash landing though, just set it down gently in some tall grass after I hit the throttle hold.
I can't figure it out, any ideas? And do they make a better 450 tail belt than Maveric? Thanks all for any advise.
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07-29-2012 03:18 PM  8 years ago
coptercptn

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Mesa AZ. USA

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I'm assuming you are referring to a Trex??? if so itsounds like you have a pulley/alignment issue...Check the drive/driven pullys for excessive wear and slop. And... I know this is easy to overlook, make sure the belt is not twisted in the tube....(Trex 101)Home of the "Sea Cobra".....
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07-29-2012 03:57 PM  8 years ago
cap231ex

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Muncie , Indiana , USA

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Like coptercptn said twistedbelt worn pulleys or a piece of FG from the inside of the fuselage boom rubbing the belt causing the breakage.

I would look it all over very closely and look for obvious things as the cause.
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07-29-2012 07:05 PM  8 years ago
Timtreo

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It has CopterX (rex clone) mechanics. I have 3 other CopterX 450s (one in a scale A109)and never had this problem with any of those. I forgot to say I also just replaced the tail pulley with the gear and also main gear and tail shaft to try to track down this problem. Belt is definitely not twisted. The Coptex tail boom goes all the way through the fuse so no way the belt is rubbing anything on there.
Thanks for giving it shot guys, anyone else?
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07-29-2012 07:17 PM  8 years ago
Timtreo

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Do you guys think the airflow around the fuse tail could be causing the problem? It was fine without the fuse on. I never really thought about because there is that huge hole in the fuse tail but now looking at the bottom of the fuse tail (the painted black part) covers most of the blade and is pretty close to the blade (not rubbing at all). Do they make longer tail shafts?

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07-30-2012 02:01 AM  8 years ago
coptercptn

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Mesa AZ. USA

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thinkin there must be some stress issue with the tail..(body) as to why or how to evaluate it? not sure. How is the tail authority?
You may have to do a torque tube with that configuration.
Sorry I can't give you a definitive cure....
Home of the "Sea Cobra".....
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07-30-2012 05:20 AM  8 years ago
Timtreo

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Tail authority is great,,, until the belt breaks... Huh torque tube you say? Never did have one of those yet. Do they make a conversion kit? I'll check into it, might not be a bad idea on this heli. I would say Ide do it as a last resort but I think I'm there. Thanks coptercptn

Edit: I might give a belt one last try and make a longer tail shaft if I can find some 3mm rod laying around. I made a 4 blade tail (haven't used it yet) with an McpX titanium main shaft that I had so I know it can be done.
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07-30-2012 05:50 AM  8 years ago
Timtreo

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Hey Cap231ex, did you see my video with the blades I got from you? It's in this "Scale" section "Made a little video". They are working great.
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07-30-2012 09:23 AM  8 years ago
Christopher J

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Im thinking there's an alignment issue as well or heat build due to strain. When running two blade tails on the outside of fenestron openings you're "forcing" a bit of air against the side of the tail. Oddly though you're breaking them when turning right no t left. I thought it would be the other way around. But then again I could be way off too. Do you have any pics of the broken belts?Christopher J
same as I ever was
"Still all set & Flying the original"
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07-30-2012 06:04 PM  8 years ago
Timtreo

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Hey Chris, thanks for the response. Yeah I have a feeling you are right about the air pushing too much on the tail there. A longer tail shaft should fix that I would think? Here is a pic of the latest broken belt.

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07-30-2012 10:36 PM  8 years ago
Christopher J

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Looking at your pic, just under where the flash is reflecting on the belt it looks like it was starting to frey there, and the break is pretty rough to so it looks perhaps heat build due to strain and possibly misalignment too. Just guessing...Christopher J
same as I ever was
"Still all set & Flying the original"
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07-30-2012 11:13 PM  8 years ago
Timtreo

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What do you guys mean when you say misalignment? The tail pulley is locked in place and so is the tail shaft so what could be misaligned? The main gear and the tail gear are perfectly matched up. I've never seen any way to adjust the alignment on my helis (maybe because they are CopterX?) Do you guys think some silicone spray on the belt would help the heat build up situation? I would like to track down what's causing it in the first place though. Thanks again for the help guys.
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07-30-2012 11:14 PM  8 years ago
cap231ex

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Good to hear you got some good use out of the blades.

Yeah I would say ChistoperJ is spot on with his last post.
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07-31-2012 12:24 AM  8 years ago
payne1967

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uk

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you sat tail authority is great but my trex 450se v1 has a very poor tail in the align ec135 body
but i haven't had a belt break
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07-31-2012 04:43 PM  8 years ago
coptercptn

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Mesa AZ. USA

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I agree this does look like an alignment/fit issue. In your earlier post you stated that you replaced the pulleys...? maybe check to see that the belt "Fits" these new pulleys, and that there isn't any burrs,etc on them also how the belt aligns to the pulley (IE not rubbing on the flanges)..and also that the belt fulley seats in the gilmer drive.
I had a similar instance with a raptor tail belt where the replacement pully was too narrow for the belt I was using...It worked..for a while.. but then ate the belt as it was primarily driving on the sides and not on the teeth...

Just a thought.
Home of the "Sea Cobra".....
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07-31-2012 05:49 PM  8 years ago
Timtreo

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Ok thanks, I'll check all that when I get it out of the fuse.
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08-03-2012 07:16 AM  8 years ago
Timtreo

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Warminster, PA USA

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That's it! I'm going to try torque tubes. I think you guys were right about the alignment thing. I put a thrust bearing washer in before the tail shaft bearing (perfect size) on the side the tail shaft pulley needed to move over and it looks like the belt rides right in the center now. 3 minutes into flight I started to hear the belt slipping so ok no big deal I just have to tighten it up a bit (new belt). It was getting dark and I had to use up 2 batteries so I got out my A109. 2 minutes in I hear something up with that one. I landed and saw the belt (Maveric high strength) on that one is about to break. I've had it with these belts on scales. I'm just going to try TT on both of them, I have a wanted ad in the classifieds for conversion kits.
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08-03-2012 06:26 PM  8 years ago
Grimracer

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Eau Claire WI

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I can not say for sure whats going on but my UH-1C has over 2 years (likey 70 or more flights) on the same belt. One can not stress enought how importent it is to have everything aligned. I do want to ask.. Do you know for a fact that the pully pitch and belt pitch "match". If they dont no matter what you do its going to break.

Grimracer

Michael J Zaborowski
Futaba USA
AMA 124909
IRCHA 5453
Find me on Parlor
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08-04-2012 04:09 AM  8 years ago
Timtreo

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Warminster, PA USA

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Hey that's a nice Huey. Well everything was stock CopterX for the first 5 or so tail breaks on the 450 EC135. Then I tried the high strength Maveric and that broke too. Now my A109 (all stock CopterX tail parts except for the grip assembly) is acting up with the tail belt starting to break, a the Maveric belt also. The Maveric belts were the same teeth count as the stock belt so I assume that means the pitch is the same??? I have identical CopterX 450s (pod and boom) and never had this problem with them. I don't want to crash my A109 that I put some work into because of a stupid tail belt breaking... I think I just give up with them. Are there any known problems with torque tubes that I should consider? I have never had a TT heli, but I was hoping it would be an end to this frustration. Any thoughts? Thanks
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08-04-2012 02:45 PM  8 years ago
coptercptn

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Mesa AZ. USA

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should be simple plug-n-fly.... but then again you are dealing with "Brand-X"... (get what you pay for??)
Always have align stuff myself and never an issue...
Home of the "Sea Cobra".....
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