RunRyder RC
 8  Topic Subscribe
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 1759 views
HelicopterAlignT-REX 600N › Got a noise and cant find the problem
01-15-2011 03:51 PM  7 years agoPost 21
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

Helicopters are mysterious. I have seen even famous celebrity contest pilots try to track down noises and vibrations forever. Don't let these guys intimidate you. If we can hear the noise it may help diagnose it.

Serveral local really good 3D pilots who know everything about heli's tried to diagnose my noise. No luck. Of course, your TREX may sound like everyone elses rattle and all. Most pilots don't hear such things. Many heli's sound terrible to me. I have one that vibrates but is quiet as a mouse - XCELL, one that is quiet and smooth but I hear occasional belt slapping in the tail boom - Kalt, and a TREX that has some sort of raspy rattling metalic noise that I am going to attack this spring.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-25-2011 08:10 PM  6 years agoPost 22
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

It's too cold to fly so I am looking for noise sources. Below are two pictures of my start shaft. Notice that it's not as hard as the rollers in the clutch bearing and they have bitten into the start shaft.

This is very crunchy when you turn it with a finger.

Second. The (metal) bearing block above the engine is too small for the bearings. They get crunchy when you tighten the too halves together. I wire brushed the black out of it and put some MA tail box shims between the halves. Not crunchy anymore. This is a really poor design. Will try it out when it gets back above 50F.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-27-2011 02:59 AM  6 years agoPost 23
RACER7696

rrApprentice

Ma

My Posts: All  Forum  Topic

I think it is the oneway in the clutch. Had the same problem

PM  EMAIL  GALLERY  Attn:RR  Quote
02-11-2011 10:34 PM  6 years agoPost 24
sonnyhad

rrProfessor

Holland,Mi

My Posts: All  Forum  Topic

In my limited experience, I've found that the starter shaft bearing blocks can be the culprit, they get ovaled out and you cannot tell by looking at them.

I think it has to do with the different materials and the way they absorb heat from the bearings.

Bald Pilots usually wear hats!

PM  EMAIL  GALLERY  Attn:RR  Quote
02-11-2011 11:16 PM  6 years agoPost 25
balsapro

rrVeteran

Gallatin,TN

My Posts: All  Forum  Topic

I think it is the oneway in the clutch. Had the same problem
same here... I'd try replacing the clutch oneway before I did anything else.

Build the Best, Fly the Best, Crash the Best

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-12-2011 02:52 AM  6 years agoPost 26
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

I'm 99% sure the noise was a bad bearing in the block above the engine. I went back to the plastic block. I tightened the crap out of it outside of the heli and bored it out on both sides for the bearing. I replaced both bearings. I will test some day soon but it is smoother than ever before.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-12-2011 04:28 PM  6 years agoPost 27
chopperben1

rrApprentice

Ontario, Canada

My Posts: All  Forum  Topic

I have the exact same issue with mine and I've been looking for it for a while now. My rattling is really only on spool up and goes away when the headspeed gets up. Please keep us posted!

PM  EMAIL  GALLERY  Attn:RR  Quote
02-12-2011 06:00 PM  6 years agoPost 28
Scott Anderson

rrVeteran

Enterprise, Al

My Posts: All  Forum  Topic

One-way is shot.....

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 1759 views
HelicopterAlignT-REX 600N › Got a noise and cant find the problem
 Print TOPIC  Make Suggestion 

 8  Topic Subscribe

Wednesday, January 17 - 11:55 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online