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Other › Tail Belt Shredding
02-08-2006 05:52 AM  12 years agoPost 1
Sign Guy

rrApprentice

Las Vegas, NV

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Has anyone else out there had a tail rotor drive belt shred for no apparent reason. It wasn't tight/loose or twisted, it just came apart. The fibers actually frayed off and stopped the motor (jammed up in the main gear) just as I was landing. Good thing I was only a 'lil off the ground.

Thanks

Better to have tried and failed than to never have tried at all!!

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02-08-2006 06:12 AM  12 years agoPost 2
HeloMech

rrNovice

Running Springs, CA - USA

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I just recently had that happen too. Not to the same extent. I saw it as it was moving around the forward gear so I landed and checked it out. I had pretty much figured that it was nicked during my first/only crash and then just progressed from that point. I pulled out alot of the fiber thread from the t/r pulley gear area. I changed the belt but have only flown once since that time.

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02-08-2006 12:37 PM  12 years agoPost 3
Cranium

rrApprentice

Orlando, FL

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I've had it happen too. It shredded then ended up getting caught and breaking. This belt had < 2hrs flying time on it.


I do not fear computers. I fear the lack of them.-- Isaac Asimov

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02-08-2006 07:52 PM  12 years agoPost 4
Thaigon

rrNovice

trenton, mi - usa

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I have had this happen twice. Once with a standard Align front pulley and plastic tail case. The other with a Microheli front pulley and a Align metal tail case. What I noticed happening is this. The belt moves to the left of the rear drive pulley and catches to the left of the tension roller. The belt then continues left of the tension roller untill it gets caught between the side of the roller and the metal case. Then it starts to shred. I have tried different tensions on the belt and still the same problem. Try removing the tension roller all together and properly tension the belt. Does that solve your problem? I have 2 trex xl's set up the same way. One will shred and one will not. I'm still working on a solution.

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02-08-2006 08:01 PM  12 years agoPost 5
lbowen

rrApprentice

York S. Carolina-USA

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I have had 1 shredded belt and the pulley had loosened and allowed the belt to move and catch the lip of the pulley. I now run quite loose on the belt and very secure on the pulley!

lbowen

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02-08-2006 08:42 PM  12 years agoPost 6
Hoverdown3K

rrKey Veteran

Rochester, New York

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Yeah, I have ruined a bunch of belts, I also tried different belt tensions, some belts lasted a couple of flight and some a couple of weeks.

Not sure why this happens, but I noticed the egde of the belt starting to fray and then shortly after that it is shredded.

-= I know there is Money in RC helicopters. I put it there=-

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02-08-2006 09:26 PM  12 years agoPost 7
Pistol Pete

rrProfessor

Seffner, FL

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had same problem but as soon as I notice (post flight inspection) i cut the filaments and with toothpick applied "very" little CA...to date still working on belt #2.

~~Enjoying the hobby one flight at a time~~

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02-08-2006 09:30 PM  12 years agoPost 8
toyturbo

rrApprentice

So. CAL

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This has happend to me before, when I had a completely box-stock Trex CDE. I have since switched to a metal tail rotor case and now spray WD-40 on the tail belt and have not had any incidences since. I believe the WD-40 is very effective in preventing friction of the belt with any part.

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02-08-2006 09:39 PM  12 years agoPost 9
jcrack_corn

rrVeteran

End of Time

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Just FYI, my crapply Align CNC tail case *broke* at the weak point where the round part that mates to the boom connects to the rest of the tail case.....just before that my belt had shredded....

Andy at align said to send the case back to him to examine, but that they had not had problems with them and had NEVER HEARD of the belt shredding problem.....

Just another quality control issue, sometimes they just "align" (lol) very poorly (front tail pully to back pulley/belt/case) and the belt rides on one side or the other ther frays.....I put the plastic XL case on my SE and it has been working great (cant push myself to spend 100 on the MH setup). I may put the CNC back on if/when andy sends a new one.

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02-08-2006 10:42 PM  12 years agoPost 10
doorman

rrProfessor

Sherwood, Arkansas

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Belt Shredding Fix...
I had the same problem with mine and at all different tensions too...
I found that the front tail drive pulley was laying back a bit in the bearing... to fix this I split the frames and cleaned the plastic pocket that the bearing sits in with some achohol and then added just the sligthest bit of epoxy and set the bearing and shaft assembly back in it and let is set up... when I put it back together the bearing could not move to the rear and I have not had a belt shred since and I would estimate approx 25 flights on the same belt with no signs of any wear at all...
To check to see if this is your problem, put a finger on top of the tail drive pully and see if you can rock it back and forth or just look and see if it is leaning back a little..
Hope this will help you out...
Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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02-08-2006 11:20 PM  12 years agoPost 11
playfair

rrKey Veteran

Rochester, NY

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I've had a failure as well where the belt slips off the idler and rubs on the tail case. Next time around I ran even looser on the tension, plus machined side flanges into the idler.
The X400 idler is already flanged and drops in from what I hear.


The sky is our canvas

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02-10-2006 02:09 AM  12 years agoPost 12
Sign Guy

rrApprentice

Las Vegas, NV

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Thanks all! I have sprayed with WD40, and so far so good. @ 10 flights with no wear. I'm going to set up a carbon frame soon, so I'll deal with the drive pulley at that time.

Better to have tried and failed than to never have tried at all!!

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02-10-2006 03:55 AM  12 years agoPost 13
monts

rrApprentice

San Diego Ca

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I flew for almost 1 year and never had to change a belt, since the SE I have had 3 shred.

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02-10-2006 04:08 AM  12 years agoPost 14
The_Widowmaker

rrElite Veteran

Bear Valley Springs, CA

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CTimrun had a belt climb onto the left edge of the rear pulley. He noticed when it happened because of the quick drop in headspeed. He landed immediately and the belt was still up on the edge of the pulley and had started shredding.

The idea of the flange roller sounds really interesting. Is there enough room there to add thin washers on each side of the rollers to get the same effect?

"I'm a Virgin.. I'm just not very good at it. "

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02-10-2006 07:46 AM  12 years agoPost 15
Edwin Dolby

rrNovice

Calgary, Alberta, Canada

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I shredded my first belt and almost crashed.

My second belt I lubed with tri-flow.

I must have 60 flights on it

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02-10-2006 03:43 PM  12 years agoPost 16
Ezra

rrApprentice

Blue Mountain Beach, FL

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I have seen this happen to others, and had it happen to me a couple of times as well, luckily during spool up or only right after lift off.

After changing out to the new blue tail drive assembly and replacing the bearings with ceramic hybrids, I have had no issues in either of mine. Knowing the very inconsistant tolerances of Align shafts & bearings, I lean towards what Doorman said as the culprit.

I know Jason Krause uses the WD-40 solution as well, but I wonder if it would be better to use some type of silicon lube that doesn't contain petroleum?

Alan

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02-10-2006 07:00 PM  12 years agoPost 17
Rick_H

rrKey Veteran

Boulder City, Nevada

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I use RC car shock silicon oil, It works great.

Rick

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02-10-2006 07:16 PM  12 years agoPost 18
J Kofoed

rrApprentice

Denmark

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I bend the allu tailbom i order to
get the belt run i the middel of the tailwheel.

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02-10-2006 07:37 PM  12 years agoPost 19
Soniq7

rrApprentice

Sacramento CA

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Ive been using STP belt dressing for automobiles. It soaks into the rubber, leaves no residue and the belts are so smooth and pliable without a trace of wear.

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02-10-2006 08:25 PM  12 years agoPost 20
Ozydego

rrKey Veteran

Westerville, Ohio

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I have never shredded a belt, and the only thing I am doing different than most is just oiling the belt... maybe it helps it slip back onto the pulley before it gets caught on the outside...

But Honey, I can't live with just stock.....

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