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HomeAircraftHelicopterThunder TigerOther › can not figure out this tail wag problem
11-07-2004 09:31 PM  13 years agoPost 1
allns47

rrKey Veteran

Richmond IN.

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I have a small slow tail wag problem..I have lowered the gain,,,,shortened the servo with no luck....I thought maybe it was the new os 50 running rich could be it but before i converted my 30 to the 50 it done the same thing...any ideas....There is no aparent vibration that I can see in hover.....thanks SHawn

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11-07-2004 09:38 PM  13 years agoPost 2
z11355

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New England

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what servo & gyro?

did you check that the tail rotor thrust bearings are
installed correctly?

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11-07-2004 09:39 PM  13 years agoPost 3
allns47

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Richmond IN.

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Checked everything you listed and it all checks out ok....

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11-07-2004 09:40 PM  13 years agoPost 4
allns47

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Richmond IN.

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I am using the gy401 gyro and digital servo 9253..What is a good gain setting.......

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11-07-2004 09:42 PM  13 years agoPost 5
allns47

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Richmond IN.

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btw this is a r30 v.2 converted to a 50..I do not see any thrust bearings in the tail in the maunal...

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11-07-2004 09:46 PM  13 years agoPost 6
z11355

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New England

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it should have thrust bearings (those 3 piece
bearings) in the tail.

Cant tell you what a 'good' gain is. I use the
minimum necessary

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11-07-2004 09:57 PM  13 years agoPost 7
z11355

rrMaster

New England

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you're right. sorry. got confused between
machines for a moment

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11-08-2004 08:11 PM  13 years agoPost 8
SPB

rrElite Veteran

Athens - Greece

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I fixed a friends Kalt Baron yesterday having same problem with same gyro. I'll just tell you some thinks to check maybe these will help.

Check your TR drive belt if is OK. In my friend's heli some teeths were missing and the TR was missing some rpm.

Check the small switch on the gyro to be on digital servo (DS) position and the delay in 0.

Make sure your mechanical set up is correct (servo arm 90 degrees on center position and the tail pitch slider distance from the tail case is 4,5 mm. Check raptortechnique.com for correct tail pitch centering).

Check if the double sided adhessive tape is intact and the gyro is well mounted on your heli.

In most GY 401 85% gain for HH is a good start. Try this gain as a start.

Make sure your rudder trim is centered.

Make your TR link movement as free as possible. Also check that the TR pitch slider moves freely in TR shaft.

Make sure that your engine is not running very reach and your hover headspeed is at least 1550 rpm. Try in a higher rpm.

Check that when you are turning the main rotor clockwise (when you see the heli from above) the TR turns counter clockwise (when you see the heli from the right side, not the exhaust side).

In raptortechinque.com there is also an explanation on how the TR blade grips should be installed. Many ppl are installing them wrong.

I think I told you all the tricks I had in my mind. To help thinks for you in my friend's Kalt the problem was a combination of many of them (broken TR belt drive, bad engine mixture, bad mechanical setup, and increased delay in the gyro pot) So maybe you have to adjust more than one thinks.

Hope I helped a little.


Sotiris
myhelis.com Flying Team

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