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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › 450 L Dominator
04-27-2014 12:41 AM  6 years ago
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brandonstill

rrApprentice

Palm coast Florida

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450 L Dominator
I have a question. When flying tail in, my tail slowly drifts to the right. How to fix this ? Shorten / lengthen my tail boom Rod ? Or just add a little left trim ? Other than this little drift, it's very stable and locked in good. I'm using the 3gx 4.0

Thanks
Life is good. Better with a bunch of Heli's
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04-27-2014 02:45 AM  6 years ago
tgalo

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USA

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If the tail drifts right, nose goes left, shorten tail control rod (right rudder) one turn and retryGravity's a bitch ant it?
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04-27-2014 02:51 AM  6 years ago
brandonstill

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Palm coast Florida

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Thanks a lot.Life is good. Better with a bunch of Heli's
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04-27-2014 03:25 AM  6 years ago
dkshema

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Cedar Rapids, IA

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The tail shouldn't drift at all. A few questions, if I may.

What transmitter are you using and what receiver are you using?

Did you go the extra mile and attempt to set the tail rotor up to eliminate any yaw when in normal/rate mode?

You never adjust trim with a heading hold gyro after it is initialized. Make certain your rudder trim in all flight modes is set to zero.
-----
Dave

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

Team Heliproz
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04-27-2014 08:34 AM  6 years ago
brandonstill

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Palm coast Florida

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This is on a dominator. Using a dx9 and 3gx. Everything was perfect. Crashed it, rebuilt it. Everything is perfect except the tail drifts just a bit, slowly to the right ( nose to the left ) I'm getting back into helis after 8 years. A lot has changed. But I'm learning.Life is good. Better with a bunch of Heli's
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04-27-2014 08:37 AM  6 years ago
brandonstill

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Palm coast Florida

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I think as Tgalo stated above. A couple turns on my linkage should get me back to perfect.Life is good. Better with a bunch of Heli's
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04-27-2014 08:39 AM  6 years ago
brandonstill

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Palm coast Florida

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Dkshema, are you thinking this could be a gain issue ?Life is good. Better with a bunch of Heli's
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04-27-2014 07:56 PM  6 years ago
dkshema

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Cedar Rapids, IA

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Using a DX9 with a 3GX isn't sufficient information. What are you using for your RECEIVER?

An external standard receiver, or simply satellite(s) receiver(s)?

The reason I ask is that many people using the 3GX with satellite receivers are not aware that their transmitter MUST control the rudder gyro gain using the CHANNEL 7/Aux 2 control.

All Spektrum transmitters default to controlling a gyro using Channel 5.

Unless you are aware of those two facts, and do nothing to fix your transmitter so that it uses the correct channel for Gyro gain, you'll always have tail rotor gyro problems, and no amount of twiddling knobs or software controls will fix it.

-----

If you are using a satellite as your receiver AND if you haven't reconfigured your DX9 to control gain using Channel 7/Aux 2, then this would explain what you are experiencing.

-----

Hope this helps explain my question more thoroughly.

Based on your response, I may be able to offer additional troubleshooting steps.

In general, the tail rotor related stuff in the 3GX unit simply doesn't drift, even if you haven't set it up for zero yaw in rate/normal mode. That is why I am skeptical that a couple of turns on tail rotor link will fix the problem.

Assuming you're controlling the gain correctly with the proper channel, tail drift with heading hold gyros is usually the result of vibrations, not being out a couple of turns on a linkage.
-----
Dave

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

Team Heliproz
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04-27-2014 08:11 PM  6 years ago
brandonstill

rrApprentice

Palm coast Florida

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I understand what you are saying. I'm just using a sattlite with the 3gx. I'm new to all this fly barless stuff do I had help setting it up when I first built it. Before the crash it was perfect, now it's still the same except the tail drift. No wag at all. I didn't reset anything at all. Just put the 3gx back on the heli and used the same linkages , same distances after the rebuild. I can even fly it today because we have about 20 to 30 mph winds today. I will be glad when I get all this figured out but as of now, I really appreciate all the info I can get.Life is good. Better with a bunch of Heli's
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04-27-2014 08:13 PM  6 years ago
brandonstill

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Palm coast Florida

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I meant to say I can't fly today. Lots of wind.Life is good. Better with a bunch of Heli's
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04-27-2014 08:15 PM  6 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Please check and let me know how your DX9 is controlling gain. Whatever you are using in the TX to run the gain, it MUST come out of Channel 7.-----
Dave

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

Team Heliproz
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04-27-2014 08:17 PM  6 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Winds here today are 25 mph with gusts so far up to 44. Not a flying day for sure.-----
Dave

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

Team Heliproz
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04-27-2014 08:42 PM  6 years ago
brandonstill

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Palm coast Florida

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Aux 2
Switch G
Life is good. Better with a bunch of Heli's
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04-27-2014 10:51 PM  6 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Aux 2. Sounds good. Check for vibrations in your heli first since this is a post crash problem and vibration is a major cause of gyro drift.

You can also put the gyro in normal mode and adjust the tail linkage to eliminate any yaw while in hover to see that helps. If you adjust the linkage remember to recheck/reset travel limits.
-----
Dave

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

Team Heliproz
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04-28-2014 03:25 AM  6 years ago
brandonstill

rrApprentice

Palm coast Florida

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Ok. I got it figured out. I was making adjustments and flying it and the tail completely stop holding and started spinning around. I hit TH and got it down. ClLife is good. Better with a bunch of Heli's
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04-28-2014 03:29 AM  6 years ago
brandonstill

rrApprentice

Palm coast Florida

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Very close call. I inspected it again and the tail blades were just spinning around the shaft and I could see that it was loose. I got it back in place and really tightened the Allen screw and it locked it back in place. I flew it again and it was rock solid so I assume before it got real loose and let go, it was slipping. Anyway, glad it's corrected now. Thanks for all the info , advise and help.Life is good. Better with a bunch of Heli's
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04-28-2014 04:13 AM  6 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Good luck. I am happy to hear you figured out what was happening.-----
Dave

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

Team Heliproz
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