trex 800 dfc pro tail wag

[uncle fester]

hey guys fresh out the box my trex havin tail wag problems all the tail assembly is free no binding so i adjusted the gyro sens it was set at 70% so i adjusted it down and it just made it worse i found i get the best results at 80% but its still not rite any ideas?

[Bonkievan]

Can you give some more info please?
Is it stock setup -3gx, Tx etc etc??

[uncle fester]

yes stock setup 3gx v4 radio is walkera devo 12s i have a lil vid i try load it up

[uncle fester]

[ame]http://youtu.be/OYTjzEP4UHA[/ame]

[Bonkievan]

I am unfamiliar with your Tx, fester. It certainly looks like too high gain but as you say it gets worse lowering, a bit of a strange one.

When changing gain percentage in your tx, can you lower it to a point where the Status light on the 3gx goes from green to red, indicating Rate mode.?

Just want to ensure you have the right channel assignment and are actually sending gain to the 3gx. Getting the status light to change will prove this.

[uncle fester]

ok i tryed that the light changes to red at 56.5%.ive moved the tail servo ball to the outside because i dont really know what align were thinking when u mont it like they say it hits the servo. im starting to think this is vibration related? thanks

[chabs]

If your tail is free from all binding, what are your ESC settings?
Have you tried running a flat line curve on fixed endpoints and removing the governor front he equation?

[DerClown]

Just friendly advice, throw 3gx to trash can and put decent flybarless system.
I put in mine 800Pro Brain unit and it flew perfectly from bench. Adjusted just tail gain couple percent.
Your issue is known for me, I faced same problem on my 500 when I put 3gx in it. V4.0 software has this tail wag issue.
This is what you can do:
1. Update to V5.0 software.
2. Adjust tail control rod lenght, that in RATE mode tail will hold in hover, not spin in one or other direction.
3. Adjust tail gain in PC software.

[uncle fester]

Originally Posted by chabs

If your tail is free from all binding, what are your ESC settings?
Have you tried running a flat line curve on fixed endpoints and removing the governor front he equation?

no binding its as free as can be i pulled the whole tail apart lubed everything its like butter.the esc settings are stock will give that a try.yes i agree im getting abit sick of this 3gx already my walkera helis fly far better with no problems .i was originally going to buy the kit without the 3gx and put naza H in it. now i gess im paying the price

[ChopsyWA]

I too have recently had the same tail wag occurring.
I have a Trex800 Pro, with ikon fbl, head speed 1700/1850/1950.

Today I tried adjusting the tail gains, but no change occurred.
This was after checking all bolts where tight.
Unfortunately I did not go over the heli to every extreme, because what happened next during flight was not a good end to my day.
While hovering, as I was checking out he tail wag, the entire tail assembly came of the boom.
Fortunately the heli was level, and I was able to make a pretty good landing considering.
The aluminium KDE vertical stabilizer had cracked in half, and had obviously tried to spin in the boom with the gouged slot instead of a hole that was now present.

I am still trying to get to the cause, but initial suspicions are the torque tube bearings shifting position.
I have managed about 20 flights before the tail wag started.

If anyone has had this tail wag, please advise the found problems & solutions if possible.

Cheers
Chopsy

[uncle fester]

Originally Posted by ChopsyWA

I too have recently had the same tail wag occurring.
I have a Trex800 Pro, with ikon fbl, head speed 1700/1850/1950.

Today I tried adjusting the tail gains, but no change occurred.
This was after checking all bolts where tight.
Unfortunately I did not go over the heli to every extreme, because what happened next during flight was not a good end to my day.
While hovering, as I was checking out he tail wag, the entire tail assembly came of the boom.
Fortunately the heli was level, and I was able to make a pretty good landing considering.
The aluminium KDE vertical stabilizer had cracked in half, and had obviously tried to spin in the boom with the gouged slot instead of a hole that was now present.

I am still trying to get to the cause, but initial suspicions are the torque tube bearings shifting position.
I have managed about 20 flights before the tail wag started.

If anyone has had this tail wag, please advise the found problems & solutions if possible.

Cheers
Chopsy

i often hover mine and watch it wag so annoying i tryed everything except going into the 3gx i have nearly got it to stop by putting the ball on the servo closest to the centre and setting the gyro gain to 100%.im going to get my friend to go into 3gx when he has time and if that dont work ima chuck it

[whan1]

Hi try to lower the gain. even if you have to go down to 0.and if it still wag at 0. then yes the 3gx is defective.

[uncle fester]

ok i give that a try 2mro if weather holds out.ive got the wag nearly under control with gyro gain at 90% and the gyro travel at 150% but its still not rite. if i lower the gyro gain the wag gets slow and big ive only taken it as low as 50% if i have the gain at 100% the wag pretty much gone but when its flying along at speed it wags ive seen guys update firmware to v5 and it fixes it. if i update to v5 will i have to setup heli all over again? cheers 3gx

[jsbach#1]

Listen very carefully to the next two things I'm about to say to you. a) That bird is NOT CHEAP to crash. b) 3GX is NOT GREAT

- I speak from experience, 3gx we all know the stories and the cures. But you're heli is NOT CHEAP so why take a chance with a pain in the ass tail. If you do a basic setup on a spektrum beastx or a vbar or a skookum with your eyes closed it will fly
just fine with no wags no nothing and tune to your liking. I never had that level of success with 3gx, they always feel very tense.

I recently had a hard landing from a poor auto on my 800 Pro because I inverted and maxed out negative pitch in normal mode esc cut power. Rookie !! I broke 6 parts plus main tail blades, the cost of repair is 770 dollars. (ironic the cost of repair is the same number as my goblin) So don't take a chance PLEASE. The frames for your heli are not strong and they are expensive, check parts pricing.

[JasonA]

Exactly.. dump the 3gx and get another FBL controller...

Plain and simple

[uncle fester]

ok whats the best eazy to setup fbl controller to get? i cant understand why align would sell there flagship helicopter with a junk heap of a 3gx cheers

[Bonkievan]

They are all easy once you know how

Skookum has one of the best setup wizards, imo. The Ar7200x doesn't require a computer but is fairly basic in feature set compared to some others.

Also, how much you are willing to spend on a fbl? As you've quite a lot of money in the air, best not to skimp on a budget fbl imo.

[JohnTC02]

First thing I did when I built all my Align birds was to dump (or have it removed from the kit) the 3GX, I love the Align heli's but hate the 3GX.

All my small heli's are running the AR7200BX, as mentioned they are easy to setup as you don't need a PC but IMO you can't beat the Vbar but they can be a bit complex at first but once you get used to them they are easy to setup.

One thing about the vbar is that once you have your heli mechanically setup most of the time the stock settings will be fine, oh and the customer support at VStabi is second to none, they even made me some custom firmware a while back which has now been added to the latest update for all to use.

I now have the Vbar Contol so will be converting all my heli's to vbar.

[uncle fester]

dont really wanna spend more than 300 but all depends

[Bonkievan]

Originally Posted by uncle fester

dont really wanna spend more than 300 but all depends

Well, in that price bracket you have a lot of choice and if setup properly, all will perform very well. Vbar, ikon, Skookum 540, AR7200, CGY750 etc etc.

Another FBL that has just come to market and has been getting very good reviews, which you could get landed in NZ for just over $325nzd , is the Spirit. It has bailout, Self level and vibe analysis which you normally have to pay twice the price for in other equivalent FBLs. Definitely worth taking a look at that, IMO.

I don't push my FBLs, and as such, find all three I run very good for each application. If you fly smack a bailout would most likey be no use to you but if not and like extra features at an affordable price, like aforementioned bailout, the Spirit would be the one I'd opt for. As soon as they come back in stock (next week apparently) I will probably get one myself.

What do most of the lads at your field fly? Pity you're not near chch as I'd be happy to give you a spin of my 800 with the BD3sx (hc3sx).