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HelicopterAlignT-REX 600N › tail boom vibration - un-isolatable!!!!
12-27-2008 09:13 PM  8 years agoPost 1
avatar71

rrApprentice

East Amherst, NY

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well, I have been flying my 600n for some time and at 2100-ish headspeed, i get a terrible hi frequency vibration. It has actually broken the tail boom bolt on fitting twice...

I have done the following...
1. balanced the tail blades
2. sent in tail grip assembly (quick uk) for service and balance
3. examined torque tube and mounted a 2nd bearing for support
4. tried alternate tail blades
5. balanced main blades and full head
6. balanced flywheel/clutch
7. balanced fan
8. balanced paddles

I dont see the vibe at 1800 or so but, after i get the hs up, the vibe is pretty bad.

Any suggestions on where else to look? I am at a loss. The next step I can think of is to replace the fan and flywheel/clutch

I am using a dubro hipoint and a magnetic balancer as well.

Sharkbait! hoo ha ha

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12-27-2008 09:27 PM  8 years agoPost 2
Roby

rrApprentice

Slovenija, Europe

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Check trust and radial bearings in main rotor head holders.

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12-27-2008 09:35 PM  8 years agoPost 3
avatar71

rrApprentice

East Amherst, NY

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check them for binding? I dont see the connection...

Sharkbait! hoo ha ha

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12-27-2008 11:04 PM  8 years agoPost 4
JAGNZ

rrProfessor

Auckland, New​Zealand

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Heli ever been crashed?


Jason Greenwood

www.3dheli.co.nz

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12-28-2008 12:02 AM  8 years agoPost 5
Flint325

rrApprentice

xxx.xxx

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If you have the pro, install a new tube and a second bearing.

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12-28-2008 01:48 AM  8 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Your list doesn't include a new, straight tail rotor shaft. Maybe it should.

And balance the entire tail rotor as an assembly -- hub, grips, bearings, tail rotor blades -- one piece.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-28-2008 03:23 AM  8 years agoPost 7
Sam2b

rrElite Veteran

Seattle, WA

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Your list doesn't include a new, straight tail rotor shaft.
I agree. If you crash or hit the tail at all and then suffer a vibe, you should not hesitate in replacing the tail rotor shaft. You're looking at about 10,000 RPM. That's huge.

Also ensure the torque tube bearing did not slide up or down the boom. If it breaks loose and slides from the middle (offset) position, then the torque rod will have a terrible wobble and therefore vibration. I've had it happen to me twice, and was the culprit of a strange vibration.

Do you use digital calipers? Did you make sure the paddles are equidistant? Even though the paddles are balanced as you say, are the paddles both mounted straight and parallel with the flybar cage?

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

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12-28-2008 12:09 PM  8 years agoPost 8
avatar71

rrApprentice

East Amherst, NY

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never crashed

i did replace the tail shaft (forgot to mention)

the paddles are balanced and equidistant

2nd bearing is in the shaft already

I guess that I'll replace stuff (TT, etc...) and recheck balances...

this is depressing. I got used to that heli being my go-to no problem one.

I guess its back to flying my rap50 for a while.

Sharkbait! hoo ha ha

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12-28-2008 12:39 PM  8 years agoPost 9
Spinky

rrApprentice

PETERBOROUGH UK

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Check main mast bearings

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12-28-2008 11:11 PM  8 years agoPost 10
JAGNZ

rrProfessor

Auckland, New​Zealand

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I also had a cracked fan and fan hub (cracks very hard to see) which caused the same thing. Maybe worth a look?


Jason Greenwood

www.3dheli.co.nz

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12-29-2008 02:42 AM  8 years agoPost 11
breaknbalsa

rrNovice

newnan,ga

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I had same on new heli. Bought it used after the guy had crashed and repaired it. I did everthing you did but still had problem. The last thing I did was grease the dampeners in the head and change the spindle (even though my tracking was perfect). Problem solved. Dont know which one did it. But its gone.

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12-29-2008 02:35 PM  8 years agoPost 12
Jag72

rrProfessor

South of Boston

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TT...

I saw somewhere else where someone was having an issue with Vibration from the torque tube being a bit too long and creating vibes due to the TT being compressed....maybe try pulling the boom back a couple of MM to relieve the pressure on the torque tube...

it's worth a try

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12-29-2008 08:41 PM  8 years agoPost 13
rcnut

rrElite Veteran

Rockford, Illinois

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Check the tail ouput shaft bearings. Make sure there isn't any lateral play. This could cause your output shaft to wabble and bend.

What type of vibration are you getting?? Up/down or side to side?

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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12-30-2008 02:32 AM  8 years agoPost 14
avatar71

rrApprentice

East Amherst, NY

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the most significant vibe is seen on the left tail boom brace. the right boom vibrates much less...

Sharkbait! hoo ha ha

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12-30-2008 03:06 AM  8 years agoPost 15
drdot

rrElite Veteran

So. California,​Orange County.

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fwiw..

Boom in too far wll definitely cause this with TT...Did you dial indicate the fan/clutch assy. for runout before assembly?

John.

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12-30-2008 04:17 AM  8 years agoPost 16
BJames111

rrElite Veteran

San Diego,​California

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Boom in too far wll definitely cause this with TT
I was thinking the same thing. I would definately try pulling the boom out a few mm's.

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12-30-2008 05:45 AM  8 years agoPost 17
MRFLYBAR

rrNovice

Northern California

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I have similar problem with my TREX 600N last week. I have looked at different possibilities but with no success. One of the guys in the club mentioned to me to try to lean the engine 1 or 2 click. Like you, I have nothing to loose but to gain a smooth flying heli. Well, it works!. Just a caution, be careful not to lean it too much and cause your engine to heat up. I hope it works for you. Good luck!

Bernie

Vaca Valley Model Club

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12-31-2008 04:38 AM  8 years agoPost 18
Dwntyme

rrApprentice

U.S.A.

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Check the clutch to issure that the liner has no lumps(high spots)also the clutch shoe maybe bad...

Love a Twitchy Heli.... :) and Remmington Model 700

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12-31-2008 05:53 AM  8 years agoPost 19
mchammer

rrElite Veteran

California,USA

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you may try replacing the screws that hold your tail blade grips to the hub.If they are bent in the slightest amount they will cause the tail to not track propperly.Sometimes just bumping the ground with the tail blades can do it.

Peace Through Superior Firepower!!!

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02-21-2009 11:23 AM  8 years agoPost 20
avatar71

rrApprentice

East Amherst, NY

My Posts: All  Forum  Topic

it was the boom. backed it out a mm or 2 and smooths as glass now!
thanks!

Sharkbait! hoo ha ha

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Scorpion Power Scorpion Power
HelicopterAlignT-REX 600N › tail boom vibration - un-isolatable!!!!
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