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HelicopterMain Discussion › Tail set-up T-Rex 450L issues.
10-13-2013 04:19 PM  4 years agoPost 1
jkurz

rrNovice

Keller,TX

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So I had a buddy set my tail up at his house so I wasnt able to watch him. I had a dunb thumb with my Trex 450L and bent the boom and tail linkage.

I have repaired the heli, looked how for the ball ends were skrewed into the old linkage and tried to replicate that.

I can take the heli up in a hover and seems solid but when I to a punch up the tail shoots hard right. Also when Im in rate mode on the ground the heli wants to spin right while on the ground doesent do that in HH mode.Im using the 3GX V4 FBL unit. (Yes I know what your thinking)

If anyone could give me a basic mech. tail setup procedure, Id appriciate it.

I pretty sure its just setup mech. wrong.

Thanks guys.

Jon

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10-13-2013 04:27 PM  4 years agoPost 2
wrongler

rrProfessor

Brewerton, New York

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There were some issues with the 4.0 3GX, I think it was advised to use the 3.1 version. Has tail issues.

Bill Whittaker

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10-13-2013 04:30 PM  4 years agoPost 3
wrongler

rrProfessor

Brewerton, New York

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This is from dkshema:
If you are collecting setup info for the 3GX, I would recommend to anyone out there to use V3.1 software instead of the recently released V4.0 version. V4.0 introduced some very erratic and poor tail rotor gyro performance. I've reverted all 8 of my current 3GX installations back to V3.1 from 4.0 until a new, fixed version of 4.x is rolled out.
Align is aware of what their V4.0 SW has done to tail rotor control, I have been advised to roll back to V3.1 until a new version of 4.x is available.
-----
With regard to settings in general, I'm finding the stock values are usually pretty good. Occasionally have to tweak the aile/elev gain pots, and perhaps adjust the tail collective pitch torque precompensation, and the collective pitch elevator precompensation; varies from model to model. Most everything else seems to require little, if any, modification.
Installations to date include T700N, T600N, T550, T500DFC, Gaui NX4, 450 Pro V2 with DFC upgrade, an original Trex 250 converted using the older "3G" style head, and a 250SE converted using a 250 DFC head.
-----

Bill Whittaker

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10-13-2013 04:42 PM  4 years agoPost 4
jkurz

rrNovice

Keller,TX

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Yes, Ive heard that about V.4. Im new to tje 3GX always been a Vbar guy.

How do you revert back to 3.1 and will I have to go through the entire setup again?

Thanks for the help.

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10-13-2013 07:53 PM  4 years agoPost 5
jkurz

rrNovice

Keller,TX

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Fixed (not totally) tail issue from spinning in rate mode, just needed to shorten the linkage a bit and even tail blades out. Seems that help it in HH mode as well. Tail still doesnt feel right. Id like to revert back to the 3.1 SW but dont wanna go through the setup of the 3GX again.
Not like it was hard. lol

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10-14-2013 02:13 AM  4 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Setup is actually pretty simple, can be done in less than five minutes, so I don't see that as a biggie anymore.

To revert to a previous version, hook the 3GX stuff up to your PC, apply power, and go to this page:

Click the "REVERT" button at the bottom right corner of the page, you'll get a window with available SW versions to choose from.

Choose V3.1, follow the instructions and load the software.

Afterwards, run the DIR setup stuff, the rudder gyro setup stuff, and the throttle/governor setup stuff.

Trust me, after having done this a bunch of times while trying to figure out V4.0, it really does take only about five minutes.

-----

V4.0 has some really odd tail rotor behavior. I've set all my installations back to 3.1 until the next revision comes along.

-----
Dave

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

Team Heliproz

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10-14-2013 02:27 AM  4 years agoPost 7
ThumbBumper

rrVeteran

A little to the right and down!

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deleted... already said...

If it ain't broke, go fly some more!
http://facebook.com/groups/TORCHS/

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10-14-2013 02:50 AM  4 years agoPost 8
jschenck

rrProfessor

La Vista, NE.

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If it was fine before the crash and isn't now then I'd look for mechanical setup first.

What you want is to have the servo arm perpendicular to the linkage. Start off by putting the 3GX in DIR setup mode so the tail servo is locked in the center. Then make sure the servo arm is perpendicular to the control rod. Then adjust the length of the control rod so the tail slider is about in the middle of the tail output shaft. You can add some bias offset so neutral servo has some torue compensation already. Then go through the whole 3GX tail setup from the start.

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10-14-2013 03:16 AM  4 years agoPost 9
es1co2bar3

rrKey Veteran

winnetka california

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but when I to a punch up the tail shoots hard right. Also when Im in rate mode on the ground the heli wants to spin right while on the ground
sounded like a torque DE compensation, 1st thing you need to do when you setup
the tail since your servo is not on the tail let me assume, your tail blade need to be at lease 2 DEG: to the right while your servo is 90 DEG:, This'll compensate for each single turn on the main blade.

make sure them blade grip don't have a lot of slack N play.

so if your tail is going to spin out it wont be violently or it wont spin out at all until you get your HH working.

I was waiting on some honey but there aren't no Queen bee,

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10-14-2013 04:59 AM  4 years agoPost 10
dkshema

rrMaster

Cedar Rapids, IA

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Center the pitch slider with the servo at neutral.

Right rudder command should make the servo PULL the pushrod forward to the nose of the heli. If it doesn't, reverse the rudder channel in the transmitter.

Turn nose of the heli to the LEFT while watching the tail pushrod. The servo must PULL it forward to the nose of the heli. If it doesn't, then use the 3GX rudder Nor/Rev setting to change the gyro correction direction.

Both must be correct before flying.

Pretty standard setup. You can hover in Normal mode and adjust the tail linkage to stop any left/right yaw tendency. Reset your rudder limits if you have to adjust the linkage any, to prevent binding.

-----
Dave

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

Team Heliproz

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10-14-2013 10:25 AM  4 years agoPost 11
Richardmid1

rrProfessor

Leeds, England

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Other things to consider... Low gain, tail pre comp not set or going the wrong way (not sure if 3GX has pre comp?), low HS and/or simply trying said punch out in normal mode with a linear throttle curve! Too much collective pitch.

60% of the time, it works every time!

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10-14-2013 11:10 PM  4 years agoPost 12
jkurz

rrNovice

Keller,TX

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Thanks for all the replies

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10-15-2013 01:08 AM  4 years agoPost 13
dkshema

rrMaster

Cedar Rapids, IA

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Yes, the 3GX has a torque precompensation setting that can be adjusted.

-----
Dave

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

Team Heliproz

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10-16-2013 08:24 PM  4 years agoPost 14
jkurz

rrNovice

Keller,TX

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Thanks for all the info

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10-16-2013 09:49 PM  4 years agoPost 15
Ladymagic

rrKey Veteran

South Korea

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Sounds more like you might want to verify that your mechanical setup is correct before touching any of your FBL settings. A bad mechanical setup will really mess with your gyro even if your programming is right.

If you didn't mess with your gyro's settings after you repaired and test flew your heli then it's most likely a mechanical issue. Not doing so first will just create more of a headache and waste time completely redoing perfectly good settings.

Just follow Dkshema's post in regards to your mechanical setup...shouldn't take long to get it done. I hope you get back up soon! Good luck

Mellisa

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HelicopterMain Discussion › Tail set-up T-Rex 450L issues.
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