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Home✈️Aircraft🚁Helicoptere-AlignOther › Trex Tail Belt Shredding
07-19-2006 08:30 AM  14 years ago
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Krypty

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Amersfoort - Netherlands

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Trex Tail Belt Shredding
Hi All

I know this topic has been covered but if this can help with just one person I will be happy. This comes from one of my friends with his horrible experiences with tail shredding on his Trex and this is how he solved it.
My modification to the Trex tail gearbox seems to be working quite well, should also recommend using Silicone Spray to lubricate the belt.

I have flown about 3 Hours in horrible conditions "Lots of wind and dust" with absolutely no dirt on the belt. The lubrication allows much less resistance on the tail drive. Do a test with it and let the heli run at 15% throttle, while the motor is still running spray the belt from the tail case side into the tube. You will quickly notice that the RPM on the motor has picked up
quite a bit...

I also replaced the tail pulley with 2 flanged bearings " PV0468 " this is from the Raptor 90 SE. The Trex has in it's spares bag a bush that will fit into the Flanged bearings, also put inner diameter size washers on the outer sides and inner side of bearings to allow free movement. The bush will sit exactly in the center of the bearings holding the center washer thus allowing the bearings to follow the angle produced by the tail belt.

As you can imagine the belt is being kept in place by something that follows its movement and therefore keep the belt from sliding to the left of the tail shaft and finally shredding. I did this mod on my
metal tail case.
If you guys want some pics let me know and I can post them
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07-19-2006 09:44 AM  14 years ago
ferret

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victoria australia

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industrial rex belts
if u pm me i can get hold of industrial belting of which a mate makes long t rex belts out of.... never had one schred yeat...
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07-19-2006 12:01 PM  14 years ago
IcemanCharlie

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Jonstorp, Sweden

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************************
If you guys want some pics let me know and I can post them
**********************************


Yezzzzzzzzz Pleazzzzze
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07-19-2006 12:15 PM  14 years ago
menace

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Sydney, Australia

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take off the tail guide pulley and remove the bearing gently.
put a nut and bolt through it that is a neat fit(dont force anything) then attach it to a drill and spin.
take a file to it with caution and groove it out gently to look like a hirobo/raptor guide pulley.
when u got the desired depth and it looks like this...
|\_____/|
| |
| |
| |
| _____ |
|/ \|

sorry 'bout the poor quality pic (LOL) but that is the shape
then get some wet'n'dry sandpaper and smoothen out.
then put bearing back in(GENTLY) and re-attach to heli and pull boom out to get a neat/snug fit.

over 100 flights cant be wrong.
!boo!
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07-19-2006 12:17 PM  14 years ago
menace

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Sydney, Australia

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sorry pic messed up, my camera has flat batteries atm...sorry.

but have a look at a raptor/hirobo tail guide pulley and copy that.
!boo!
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07-19-2006 12:35 PM  14 years ago
Jon the Rooster

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Johns Island, Charleston, SC

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Using a little Silicon spray on the belt increases the belt life tooand one more thing "DON'T BE AFRAID!"
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07-19-2006 02:45 PM  14 years ago
heliboy1023

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Tinton Falls, NJ

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I really don't know how you guys are destorying belts. My first belt has over 40 flights on it before I MESSED IT UP. This next belt I have has 15 flights on it, no wear, and no messy lube.

Just set your belt tenstion correctly, and your belt will last. Simple as that, since none of these mods are needed.
You know you have to many heli's only when your wallet is empty.
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07-19-2006 03:46 PM  14 years ago
CHEVPRO

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Mississauga,Ontario

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Just use the tail pulley from the MX400 it is flanged and fits in with no modifications.
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07-19-2006 04:47 PM  14 years ago
caseyjholmes

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Portland, Oregon

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I find a good way to check belt tightness is to hold the tail rotor still and spin the rotor head by hand. IF the tail belt skips, you need to tighten it a bit more. Keep tightening it untill it wont skip, but still feels a bit loose. Make sure you apply some amount of presure when turning the rotor head and holding the tail rotor still, as this will simulate the heli under load or fast punch out, and you can adjust belt tension accordingly. It shouldn't skip, but it should still be sort of loose. You will find a good amount of difflection in a tensioned belt, more so than seems like it should be there..
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07-19-2006 05:01 PM  14 years ago
colin8

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Phoenix, AZ

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I've noticed that the Align pulleys have a small molding gate flash on the inside of the pulley flange. I found one belt was slightly frayed after a crash. When I installed the new pulley, I noticed the pulley flash and trimmed it way with an Xacto blade. Many hours of flying now and no sight of any belt fraying. I wonder if this might be the problem some are seeing.

--Colin--
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07-19-2006 05:04 PM  14 years ago
TRex888

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Monmouth, UK

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You'll get good belts and bad belts. I've had a belt that lasted 150+ flights and another only 20 flight. 100+ should be the target me thinks. One guy has reported 700+ flights on his belt!!!
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07-20-2006 12:01 PM  14 years ago
firestat

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Columbus Ohio

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Now, this is what my LHS owner did, and told me. I have not tried it yet.

Microwave the belt for about a minute. Place the belt in a plastic bag and soak in silicon oil for a couple of hours.

He also ran an Exacto blade around the boom openings to take the rough edges off.

He has the smoothest tail and rotor I have ever seen.

I will give it a try.
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07-20-2006 07:51 PM  14 years ago
Slowpoke

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Dublin, OH

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I'd like to try the silicon spray. Is there are specific kind to get, or can I just walk into the hardware store and ask for a can of silicone spray??
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07-20-2006 08:13 PM  14 years ago
glucoseboy

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SF, CA

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slowpoke:

OSH has them, look in the automotive section
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07-20-2006 08:26 PM  14 years ago
KamikaziRcPilot

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Cincinnati, OH

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I've been using a Silicon/Teflon spray made by DuPont. I picked it up at (I believe) Auto Zone. I've not had any problems since I started using it.
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07-20-2006 08:47 PM  14 years ago
crusader4u

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St.Kitts. Canada

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80 flights, same belt. using silicon spray!
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07-20-2006 08:54 PM  14 years ago
KamikaziRcPilot

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Cincinnati, OH

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After experiencing one tail belt failure in-flight and helplessly watching it pyro into the ground (it was in a hard banking turn at the time...), I've started to keep a simple flight log. I examined the broken belt and couldn't find any sign of cracks or shredding. I plan to replace the belt every 100 flights regardless. This will also give me the opportunity to closely examine other parts while I have it disassembled.
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07-20-2006 08:56 PM  14 years ago
Slowpoke

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Dublin, OH

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Thanks guys, I'll pick up some tomorrow. I haven't had any belt shredding yet, buy why wait?

Know of any sprays that will help my piloting skills?
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07-20-2006 09:09 PM  14 years ago
KamikaziRcPilot

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Cincinnati, OH

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No, but they are some pills that will keep it up longer!

Sorry, couldn't resist...

The root problem with belt shredding is a belt that's running off-center on one or both pulleys and rubbing against the edge of the pulley. The best solution would be to get the pulley to run in the center, but who knows if that could ever be consistently achieved.

I had thought that if the pulleys were slightly rounded up in the middle, that would keep the belt in the center. Our vacumm cleaner uses this technic to keep the brush belt centered.
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