Topic Subscribe
WATCH  1 page882 viewsPOST REPLY
Ron's RC Helicopters . Thunder Power RC . Mikado
. .

Flybarless Rotor Head Systems

 >

Align 3G
3gx tail problem!!
BABoyd

Heliman

Lewisville N.C. USA

Installing 3gx on my trex 450. Hovered for the first time and it comes up in air really solid but when I turn heli left or right slightly it starts violent wag and I land it real quick. All my mechanics, travel limits, and tail setup on gyro seem to be right!! Anybody have any ideas???

08-03-2012 Over year old.
nappyroots2182

Elite Veteran

Moline, il

is it on small heli mode?

08-03-2012 Over year old.
BABoyd

Heliman

Lewisville N.C. USA

Yes, Have it on red light for small heli. I,ve owned and built lots of helis. I think I have everything right, but something is definately wrong I just do'nt know what? Thanks for reply!!

08-03-2012 Over year old.
Raptorz499

Key Veteran

NJ

The gain set too high?

08-03-2012 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

Sounds like gain is too high. Are you sure you're using the channel you think you are to control the gain?

-----
Dave

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

Team Heliproz

08-03-2012 Over year old.
BABoyd

Heliman

Lewisville N.C. USA

Im using dx8 and currently have head gain set to 30 percent, which is equivilent to 65 to 70 percent on a dx6i. I started out at 35 and dropped it to 30 with no change so I didnt think this was problem. Im pretty sure I have everything on correct channel aux2, becuase I have rate mode set at -25 when I flip to rate mode tail slider centers like it should. I guess I can drop heading hold down to about 20 percent and see what it does! Wish me luck!!

08-03-2012 Over year old.
BABoyd

Heliman

Lewisville N.C. USA

Tried at 20% gain wags slower about foot each way back and forth. Went up to 25% gain and it goes back violent about out of control. When you bring it up its perfect locked in until you use any rudder, once you touch rudder its on!! LOL

08-03-2012 Over year old.
jimjag

Heliman

houston texas. usa

is it a older trex 450 if so make sure your tail pushrod guides are straight inline and that with out ball link on test the pith slider too make sure its smooth with no drag...the 450 definetly had that problem or switch to the carbon fiber rod...tail hold way better...

08-03-2012 Over year old.
jimjag

Heliman

houston texas. usa

meant pitch slider lol...

08-03-2012 Over year old.
BABoyd

Heliman

Lewisville N.C. USA

Brand new out of box 3gx 450. Before I even put together I bought carbon fiber push rod, kde metal slider links, and metal control arm that rod hooks up to. Also added 1.75mm length to tail shaft to give more right travel to compensate for tourqe. The tail on the 450's are a poor design in first place. This is the 4th trex 450 i've owned, 2nd flybarless. I bought this kit airframe only and purchassed 3gx unit used seperate. Guy said it was working great for him. He said he updated firmware to 2.1 before sending. Does anybody know if this could have anything to do with my problem??

08-03-2012 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

What receiver are you using with the DX8 in this heli. Are you using the Spektrum satellites, or are you using an external full-up receiver?


Your trouble isn't version 2.1 software, that stuff works well.

-----
Dave

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

Team Heliproz

08-03-2012 Over year old.
BABoyd

Heliman

Lewisville N.C. USA

using sats, noticed it would only bind up dsm2 I have my dx8 on 11ms dsmx in frame rate menu on transmitter, but when i bound it up it said binding 22ms dsm2 is this correct for a 3gx 2.1

08-04-2012 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

Are your satellites DSMx versions? Not that the satellites are the problem or even the mode things bind up, in. I asked to make sure that AUX2 really was the Gyro Gain channel.

Come to think of it, the DX8 defaults with the Gyro gain controlled out of channel 5, and the Governor controlled out of channel 7 (Aux 2). That's opposite of what JR systems do.

So the question remains, are you really controlling gyro gain with the channel that you THINK is controlling it?

-----
Dave

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

Team Heliproz

08-04-2012 Over year old.
BABoyd

Heliman

Lewisville N.C. USA

I went in switches in transmitter and put gyro on aux2 before I even started setting up 3gx. When I flip my switch from heading hold to rate mode you can see servo center.Im only useing one sat for now. I have to get another one yet. My sat that I am using is dsmx. Does the 3gx not bind up dsmx?

08-04-2012 Over year old.
coolice

Key Veteran

Northamptonshire, England

Hey.

The 3GX will only bind in DSM2 mode, even if you are using DSMX sats. Shame as you will not benefit from the faster transmission rate afforded by DSMX.

When using sats on the 3GX, gyro gain defaults to channel 7 (AUX2) and so this channel will control your tail gyro gain. However most radios, such as the DX8 will allow you to map this channel to almost any switch location on the Tx, so it can be switched to the GYRO position if need be.
You could just leave any govenor option disabled and use the AUX2 ATV values to adjust gyro gain as required.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

08-04-2012 Over year old.
HOMEPAGE  
BABoyd

Heliman

Lewisville N.C. USA

It is unfortunate that dsmx won't work! Before I started I disabled my gov. switch, put it on inhibit, then went to switch select and mapped gyro to aux 2. I really don't think my problem is with gain, switches, sat, or anything like that. I know the person I purchased gyro from updated it to 2.1 before sending it. Does anybody know if it could have anything to do with glitch in update or something???? Thanks for all replies everybody!! Maybe one of these days I figure it out!! lol

08-04-2012 Over year old.
coolice

Key Veteran

Northamptonshire, England

Hey.

Yes it is, maybe a future firmware from Align may incorporate DSMX protocol so that DSMX users can get maximum response.

Two other tail problem ideas;

1. Where do you have the rudder lock gain slider set to in the pc software? Of its at the default 70% this can be too high for most tail servos, especially Align, so back that down to 45-50% and try again.

2. Tail blade grip bearings, specifically the thrust bearings but also the radial ones. It's a common problem on 450's for these to get rough through use and because the tail rotor blades hit the ground easily making the bearings bad. Also loctite can easily penetrate the bearings and seize them.
If they are rough, then under load with the tail rotor spinning they lock up, the tail servo Connor move the tail grips freely and so small corrective changes in tail pitch are impossible. Eventually the servo moves the slider, but its by too much movement and a persistant wag sets in which no gain adjustments can fix.
Might be worth you stripping the tail grips to check, relubricate and reassemble if no parts need replacing.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

08-04-2012 Over year old.
HOMEPAGE  
BABoyd

Heliman

Lewisville N.C. USA

I put setting on 3gx to 450 beginner, but I have'nt went in menu and lowered any settings. I will try that! The tail is slick as butter, can literally blow on it with linkage unhooked and get it to move. I also checked bearings with no notching whatsoever, smooth as silk! Im in no hurry to get fixxed I have 4 other helis, so im not hurting on haveing something to fly. It just frustrates me that I cant get this thing figured out!! Thanks for ideas coolice, going to try to reupdate firmware, rebind, go through complete setup and lower settings!! Let ya know later how it goes!!

08-04-2012 Over year old.
WATCH  1 page882 viewsPOST REPLY
Futaba-RC . HeliProz . Boca Bearings
. .

Flybarless Rotor Head Systems

 >

Align 3G
3gx tail problem!!
 Print TOPIC Advertisers 

Topic Subscribe

Wednesday, July 23 - 11:09 pm - Copyright © 2000 - 2014 runryder.com | email | runryder needs cookie