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HomeAircraftHelicopterThunder TigerRAPTOR 90 › R90 tail crazy tail, please help!!
02-04-2008 01:30 PM  10 years agoPost 1
Germann

rrNovice

Denmark

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Hi

I have a R90 with a strange problem.

I have shakes on the tail from side to side in hoover (also on the ground).

As long I have been the owner of the heli it has been a problem :-(

Her is what i have tryed:

- I have changed the motor with a brand new OS90
- mounted at new funtech pipe
- new clutch glued in
- new flybar and paddels
- balanced the main blades
- balances the tail blades
- mounted another gyro and servo
- I have been spinning up the tail with a drilling mashine, and there was no shaking.
- i have tryed to hold the tail and turn the mail rotor... there is no slip or broken teath.
- it is NOT a gyro gain problem

The tracking is perfect, the motor is new so the needles is out, the motor sounds good and the temperature ok.

I am thinking about changing the mail and tail blades, but im at not sure if this will help

Now the big question: Why do i still have a crazy tail

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02-04-2008 01:44 PM  10 years agoPost 2
colsy

rrElite Veteran

Cambridge, UK

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- it is NOT a gyro gain problem
you sure

I'm not convinced.

Col.

Only Quote From Experience.

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02-04-2008 01:56 PM  10 years agoPost 3
Germann

rrNovice

Denmark

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2 differnet gyro systems, tryed with different gains.... i am convinced.

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02-04-2008 02:20 PM  10 years agoPost 4
Swoop

rrElite Veteran

Newark, DE USA

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Have your bearing holders shifted to one end inside your torque tube? Happens if they have not been glued or just have vibrated loose. Just trying to think of things you didn't mention above.

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02-04-2008 02:26 PM  10 years agoPost 5
Kader

rrApprentice

Czech Republic

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Check clutch bearings, especially that one in low position (the bigger). My friend had the same problem with R90 and gyro 611 this weekend and the reason: clutch bearing was failed.

JAN

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02-04-2008 02:26 PM  10 years agoPost 6
arceye

rrVeteran

UK

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Just for the hell of it remove the gyro completely, use a slow standard type of servo and get it into the hover without any kind of gyro, that is the only way to totally remove the possibility of it being a gyro problem. You may have a tight or sloppy link and it could be anywhere from the servo to the actual tail rotor blade grips.
A shake from side to side on the tail can really only be caused by the tail rotor itself as anything else would create a circular oscillation.


Kasama Head :(
The Blingiest DOWNGRADE a Raptor can have

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02-05-2008 12:08 AM  10 years agoPost 7
Raptor Pilot

rrVeteran

Northern Ireland U.K

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And if you think arceye is jokeing...... well, when i learned to hover there was no such thing as gyro's to help you. Its not the first time i have hoverd a raptor with no gyro to prove the gyro isnt at fault. It is quite easy as long as you dont give sudden increases or decreases in the collective and do not use a fast servo because if you do you will soon see what the gyro is compensating for.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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02-05-2008 07:11 AM  10 years agoPost 8
Germann

rrNovice

Denmark

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Hi all

Thanks for your answers.

My bearing holders in the tail was loose, but im not sure if they haved moved to the one end. I have glued them now, and will try fly again.

I have heard that at rich motor also can cause the tail problem, is that right?

The oneway bearings seems to be ok.

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02-05-2008 05:11 PM  10 years agoPost 9
Swoop

rrElite Veteran

Newark, DE USA

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Yes a rich motor will cause a tail tick. An overly lean motor will as well.

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