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HelicopterAlignT-REX 600N › Vibration after crash
07-09-2008 03:47 AM  9 years agoPost 1
Nalizan

rrApprentice

Coppell, TX 75019

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Well I finaly had my first crash on the 600. Nothing major just a low altitude engine flame out due to clunk line tearing where it attaches to the nipple. I was mid flip when it happened and did not appear to have enough headspeed after getting back upright. All it appeared to do was bang up a blade and dent in the boom. Linkage popped off a grip but did not break.

I replaced the boom and blade. I put in a new main shaft , main shaft bearings (upgraded to metal blocks) , feathering spindle , clunk line. I hovered the heli for the first time again today after this minor rebuild and it appears to have a vibration that was not there before. Anything else I should check that could be bad

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07-09-2008 03:55 AM  9 years agoPost 2
EZ TIGA

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kona,hi,us

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did u put the main shaft in the new bearing block before u tighten the bolts on the block. did u ck the pinion bearing too.

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07-09-2008 04:16 AM  9 years agoPost 3
Nalizan

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Coppell, TX 75019

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No I put the main shaft in after the blocks. Are you supposed to leave them loose until its in ? What are the pinion bearings?

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07-09-2008 06:14 AM  9 years agoPost 4
artimus

rrKey Veteran

Buckley WA

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There the ones that support the pinion gear and the clutch bell.

Fly Hard......Team Viagra

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07-09-2008 02:38 PM  9 years agoPost 5
Nightstalker

rrElite Veteran

UK (BEDFORDSHIRE)

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Check ur blade grip bearings, they get damaged very easy.
Get the blade grips and take then links off now rotate the blades grips they should be nice and smooth and not notchy. if they are then that will be ur problem

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07-09-2008 03:48 PM  9 years agoPost 6
Sam2b

rrElite Veteran

Seattle, WA

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Nalizan, you did not mention the replacement of the fly bar? Did you by chance bend the fly bar back in place? If so, get rid of it and install a new fly bar. You also must ensure the flybar paddles are equidistant from the outer flybar cage, and that both paddles are level with the flybar cage.

Another thought: did you break tail blades? If so there might be a chance the tail blade hub is slightly bent. That is an easy replacement too.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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07-09-2008 05:37 PM  9 years agoPost 7
MolokaiBoy

rrKey Veteran

Lahaina, Maui,Hawaii USA

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Is it belt or TT? Did you check your tail rotor shaft?

Les
Maui RC Modeler's, Big Island RC Helis, http://www.facebook.com/mauirc

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07-09-2008 09:59 PM  9 years agoPost 8
Nalizan

rrApprentice

Coppell, TX 75019

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It did not bend the flybar. It was not really a bad crash at all it basicly was just a boom strike. I did find out what the problem was today. I was using the one good blade from the crash with another good blade a friend had from one of his crashes. I thought Radix blades were all made to a spec and should weigh the same but I guess not. I put on some new MAH blades and no more vibration. I weighed the 2 radix blades and found one to be 138.5g and the other 141.5. Interestingly the MAH blades weighed less somewhere in the high 120s or low 130s I can't remember.

On a side note the MAH blades seem to have a lot more cyclic responce. I think I like them

Thanks for all the suggestions and help

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07-09-2008 10:34 PM  9 years agoPost 9
Nightstalker

rrElite Veteran

UK (BEDFORDSHIRE)

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All blades are balanced in pairs,

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07-10-2008 01:17 AM  9 years agoPost 10
Sam2b

rrElite Veteran

Seattle, WA

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I agree with Nightstalker. Unless you precision balence the blades yourself then you might be free from vibrations. Otherwise don't expect much. You can't merely grab another blade... unless you get lucky.

If vibes still plague you, replace the fly bar anyway, and track the paddles. Don't assume parts are OK after a "just a boom strike." I'm sorry to be the bearer of bad news. Good luck.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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