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Other › belt dust = boom sharp
10-13-2005 08:28 AM  13 years agoPost 1
Tmaster

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TX

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I did my searching on this and found good info, But I thought I might as well post up incase some people don't know.

I have about 10 flights on my Trex CDE now and I noticed belt dust in the front and the back and inside the boom. Yes my belt is riding to the left as normal. Turns out with the belt riding on the left of the pulley, when the belt slaps or gets torqued it is scoring on the end of the boom. Which causes the dust and causes the belt to frey.

Cures for the belt problem:

Cut the area of the boom out where the belt is slapping the inside and smooth it out. Or you can just try and sand the end of the boom smoother where it hits.

or get the Ark400 guide pulley.

PS: the belt looks loose in the pic becuase the other half of the gear box is not on the boom to make it tight

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10-13-2005 08:32 AM  13 years agoPost 2
toyturbo

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So. CAL

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Great tip!

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10-13-2005 10:59 AM  13 years agoPost 3
Professor Fate

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Goose Creek S.C.

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Check the pullies also. I had one of the new black pullies that was tapered, it forced the belt to to one side wearing the belt and it would make a ticking sound.

Welcome my son, Welcome to the machine

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10-13-2005 10:30 PM  13 years agoPost 4
RV-4Mike

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San Diego, Ca.

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The other alternative is to get the Align metal tail gear case. My stock CDE plastic gear case didnt have the TR shaft perfectly perpendicular to the boom. As a result the belt was always riding up on the rear gear and wearing on the case. Finally broke the belt.

The ARK 400 idler pulley will fix the problem, but it's kind of a crutch. Now the belt will run up against the shoulder on the pulley. Has to create some drag. Might be minimal and a non-issue, but I'd prefer to actually fix the problem rather than band aid it. Just my opinion.

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10-13-2005 10:51 PM  13 years agoPost 5
Tmaster

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TX

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Hmm i never though about a differnt gear box. good info!

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10-14-2005 09:39 AM  13 years agoPost 6
DR YEN

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Arcadia, CA

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PhatPhenders56,

I also get the ticking noise after flight as headspeeds drop when I lower the throttle to 0%, could you clearify the cause of this and how to resolve it?


Thank you,


DR YEN

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10-14-2005 11:11 AM  13 years agoPost 7
Professor Fate

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Goose Creek S.C.

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The ticking was coming from the belt trying to climb over the pulley. I swapped out the gear/pulley with a V2 unit, ticking went away, belt ran true.

Welcome my son, Welcome to the machine

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10-14-2005 06:35 PM  13 years agoPost 8
Tmaster

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TX

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The ticking noise is caused by the belt not being tight enough.

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10-14-2005 06:48 PM  13 years agoPost 9
Professor Fate

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Goose Creek S.C.

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I had the ticking no matter what the belt tension was. I'll post a pic of the pulley assy later if I still have it.

Welcome my son, Welcome to the machine

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10-14-2005 06:51 PM  13 years agoPost 10
Tmaster

rrKey Veteran

TX

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wow.. maybe its a different noise for the pulley. Mine was more like a tinging noise, and it was just spinning down from rotating. Kind of like you grazed your finder nails over the boom to make a sound.

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10-14-2005 07:00 PM  13 years agoPost 11
Professor Fate

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Goose Creek S.C.

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Check the bearings also, you could have one that's pitted.

Welcome my son, Welcome to the machine

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10-15-2005 08:17 PM  13 years agoPost 12
Tmaster

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TX

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well, it looks like the guide pulley keeps the belt down from scraping the left top edge. But I notice now that its pretty easy for the belt to rub the bottom left area.

I think it would be a good idea to smooth both ends of the boom with some 1500-2000 wet grit sand paper. Doing that and the Ark400 pulley should take care off all the belt fraying issues. Again there are so many things envolved with the belt drive. (boom, tension, pulleys, guide..etc..

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11-01-2005 01:29 AM  13 years agoPost 13
iceman33

rrNovice

FoShan City GuangDong Province China

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I design a pulley.that with the guilde edge and the inner diameter is same with the stock one.

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11-05-2005 04:05 AM  13 years agoPost 14
Tmaster

rrKey Veteran

TX

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I got a new belt and put it on. Not using the guide pulley at all. I haven't even had the belt in the air yet, But i've let it run for about 10 min here on the ground watching it. On some parts of the belt the sides are wearing through already!!! Im really pissed becuase I sanded the edges of the booms smooth on both ends and made sure the pulleys were not rough on the flanged parts. I notice the belt is not strait all the way and when the heli is full throttle I can see the belt shaking against the boom from it going so fast. It also rides up and down the front pulley. What do i need to do? These align belts are not very good. SHould I oil the belt? Cut the boom back further? Soak the belt in somthing?

2:42am
I came accross a idea, I can line the boom ends/inside with paper and then see where its rubbing, it should mark the paper for sure. I'll figure this out, so the belts last a long time!!! hopefully...

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