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HomeAircraftHelicopterHelicopter Main Discussion › Tail shudder - not really a wag
04-02-2009 07:54 PM  9 years agoPost 1
jgheli

rrNovice

united kingdom

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Hi There,
I have an issue with my trex 600 nsp. Just built.
As I bring the RPM up i get a tail shudder. Not rhythmic like with a tail wag ( I have seen wag caused by gyro issues on my raptor.
This is different. Every 2-3 seconds i get a shudder through the tail.
Engine seems to be running sweet. Has had three/four tanks through it.
Have managed to get airbourne half a dozen times but this shake makes me want to land!
ANy help out there?
Everything SEEMS tight. Was set up as per manual. This is my third build. Trex 450 and raptor 30 before this.....so not completly green.
Help!

Running with a 401 gyro, 9254 servo, t7c futaba tx.

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04-02-2009 11:31 PM  9 years agoPost 2
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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if the engine is running even a LITTLE rich, it can be a bit inconsistent...even though you may think it sounds fine. the inconsistency with the motor will shake the tail a bit.

try leaning out the motor one or two clicks at a time.

Shawn
Team Leisure-Tech
Team HelixRC

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04-02-2009 11:39 PM  9 years agoPost 3
JetFire

rrKey Veteran

The Golden STATE

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I've never had a tail issue do to rich setting but that's not to say it doesn't happen. However, I've had the tail doing strange things before if its running too lean. Could very well be your problem.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-02-2009 11:42 PM  9 years agoPost 4
VooDooX

rrElite Veteran

San Francisco Bay Area CA, US (San Mateo)

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ALSO the tail servo could be twiching due to interference you running a night setup or anything? make sure gyro and tail servo wires are away from anything that causes too much interfernce like bec's esc's night wire or anything like that also could be a reciever problem if its not the engine

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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04-03-2009 01:16 AM  9 years agoPost 5
Dilbeck

rrElite Veteran

Springdale Arkansas

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Or go back to beginners corner and read the replies on the same question.

Clint

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11-01-2009 04:37 PM  8 years agoPost 6
jasonrusso

rrApprentice

Haverhill, Massachusetts

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Was there ever a solution to this problem?

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11-01-2009 07:56 PM  8 years agoPost 7
McKrackin

rrProfessor

Lucasville,Ohio

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Or go back to beginners corner and read the replies on the same question
How do snobby replies like that help?
Most people new to a forum don't know how to use it completely.
If this question has been asked and definitively answered,provide a link to it.Not some elitist BS.

I literally never use the word literally right.

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11-01-2009 08:02 PM  8 years agoPost 8
McKrackin

rrProfessor

Lucasville,Ohio

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To the question....

I fly EP and not nitro but I've had that shudder.
First I added a little gyro gain.That helped.
Then I increased the head speed and it smoothed it out.

Hope that helps.

I literally never use the word literally right.

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11-01-2009 08:20 PM  8 years agoPost 9
McKrackin

rrProfessor

Lucasville,Ohio

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For the record....I just went through 15 pages at the Beginners Forum and this question never came up

I literally never use the word literally right.

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11-01-2009 08:46 PM  8 years agoPost 10
jasonrusso

rrApprentice

Haverhill, Massachusetts

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First I added a little gyro gain.That helped.
Then I increased the head speed and it smoothed it out.
The gyro gain doesn't change anything. It gets low enough that the tail starts to drift, but the shudder doesn't go away. This problem comes up when the engine starts singing, and the heli lifts off. The shudder is also present when the heli is in FF.

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11-01-2009 09:01 PM  8 years agoPost 11
LonR

rrElite Veteran

Macomb,Mi

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Is the motor new?If not check the rear bearing.Sounds like a vibration somewhere.If its new (the motor) and still breaking in that could be a problem too,a rich running motor can cause a tail twitch.once you get another 2 tanks through it,turn the main needle in 1-2 clicks.

600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan

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11-01-2009 09:05 PM  8 years agoPost 12
imnxtc

rrVeteran

BC.Canada

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Or go back to beginners corner and read the replies on the same question
How do snobby replies like that help?
Most people new to a forum don't know how to use it completely.
If this question has been asked and definitively answered,provide a link to it.Not some elitist BS.
I guess you didn't look to hard. Here it is.

https://rc.runryder.com/t505780p1/

So I would not consider his comment elitist at all. Seems he was just trying to save himself more repetitive typing.

In order to provide an overall positive response here to the question. I think that jgheli would probably have been better served, if he would have worded his post in this manner (as multiple posts in different forums, on the same site, is really not considered proper etiquette:

" I have posted this question in the Beginners Corner forum here on RR but do not seem to have been getting much response. Could you please check it out:

<link to thread>

Please help if you can as the problem persists.?"

Note also this same question repeated here:

https://rc.runryder.com/t509923p2/

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11-01-2009 09:19 PM  8 years agoPost 13
imnxtc

rrVeteran

BC.Canada

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Could also be a binding bearing problem, e.g. a bad rear motor bearing, or a bad bearing in the tail rotor system.

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11-01-2009 09:21 PM  8 years agoPost 14
LonR

rrElite Veteran

Macomb,Mi

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600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan

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11-01-2009 09:23 PM  8 years agoPost 15
McKrackin

rrProfessor

Lucasville,Ohio

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Oh,jeezus.I just reallized the question was asked in APRIL

Whatever.......

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11-01-2009 09:40 PM  8 years agoPost 16
McKrackin

rrProfessor

Lucasville,Ohio

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With titles like...Anyone got THE answer?? before I give up for good!...I don't even look.
I guess you didn't look to hard. Here it is.

https://rc.runryder.com/t505780p1/
Seeing that the question was asked more than six months ago,,,What page was it on?

I didn't notice the date on the post so I didn't know that the question had faded away a half year ago.
That's why I thought that one reply was so rude.
The post he was referring to is long gone but it was there the day he made the post.

Anyway...I'm sure it's worked out so,what's it matter anyway?

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