Backwards drift

[harling65]

Running V1.2 in my 600efl and during the flight the heli develops a backwards drift.
The balance is correct and it doesn't drift in the hover when starting.

Would running V1.1 resolve this? Does anyone know which setting to adjust to stop this?

Searched the site but can't find much info on this.

Any help greatly appreciated.

[exiged]

Theres a monster thread on helifreak about this.I think some units went back to align but not sure what the outcome was.

Mine seem to do it sometimes but not others so not sure if its the 3gx or not.ive got 1 on v1.2 and the other on v1.1 by the way.

[harling65]

I saw the thread on HF and it isn't very conclusive as it doesn't seem to affect all units.

Bought mine last summer, so is an early build, maybe its defective.
Flys good otherwise.

[tourerjim]

Running V1.2 in my 600efl and during the flight the heli develops a backwards drift.
The balance is correct and it doesn't drift in the hover when starting.

Would running V1.1 resolve this? Does anyone know which setting to adjust to stop this?

Searched the site but can't find much info on this.

Any help greatly appreciated.

I found lowering the 3rd one down" lock gain stops on aile & elev parameters, if the default is 70% lower to 50%

[coolice]

Hey.

I've not experienced this backwards drift myself, but did have a 600EFL brought to me to setup which did suffer from it initially after it was built. I took all the servo arms off, went through the whole DIR setup mode again, trying the different servo arms on each servo to allow minimal subtrim (only then needed on one servo) and the machine was then flying great.
Out of interest how much, if any, subtrim have you had to dial in an on what channels? What transmitter are you using?

Where about is the 3GX mounted on the model and is there anything that can hit against the unit in flight, or are the servo wires held tightly or too loose and they could possibly be moving around?

After initial programming, did you perform a rebind to setup the failsafe to how the model is set? I've read this can cause funny things if not done, but is always something I have always done to make sure my failsafe is set correctly to the model setup.
.

[harling65]

Thanks Gents,
I have setup with DIR a number of times but haven't changes over any servo arms (yet).

I am using a DX7 with a standard 600efl using two satelites and a Hyperion Li-Fe 2100mah. The 3gx is mounted in the recomended postion with the connections facing the motor, there is no slack or tension that I can detect. The plugs seem solid in their housing.

Subtrim used is, Ail 14, Ele 0 and Pit 12 the swash mix is showing Ail 49, Ele 50 and Pit 43.

I rebound the system using the zero pitch and throttle cut settings. The system boots as normal and the two Sats light straight away.

The only setting I have changed is Flight Condition Control which is at 80 following advice here.During fff the Heli does also pitch up but is easily controlled.

Fantastic machine and love flying it.

Mark

[harling65]

I found lowering the 3rd one down" lock gain stops on aile & elev parameters, if the default is 70% lower to 50%

Thanks, I will change this setting to see if it helps, don't want to make too many changes at once as I won't know which parameter made the difference.

My subtrim isn't excessive but can I use plastic servo arms to get the arms level without subtrim? The kit came with plastic star arms. Being FBL, I assume that the torque is the issue.

[coolice]

Hey Buddy.

Give these settings of mine a go; http://www.rcheliaddict.co.uk/align-...ngs-files.html and let me know if you find them better than the ones you are currently using.
On all my 3GX setups I go straight to these as they are what I worked out for my own model and they really smooth out the feel of the model, yet still remain 3D'able.
.

[harling65]

Will load them up and give it a try.
Thanks

[tourerjim]

Thanks, I will change this setting to see if it helps, don't want to make too many changes at once as I won't know which parameter made the difference.

My subtrim isn't excessive but can I use plastic servo arms to get the arms level without subtrim? The kit came with plastic star arms. Being FBL, I assume that the torque is the issue.

The only way I can describe it is a slow centring action on the swash plate, I think your find if you do a slow forward flight heli will continue a forward drift but seems more noticeable on tail drift, I've found making these parameter adjustments will speed swash centring but you may need to up the gain pots slightly.

Swash levelling tools is the only way to check if you've used to much sub trim, with the tool you can check if you've got any servo interaction between - 0 +

[harling65]

Hey Buddy.

Give these settings of mine a go; http://www.rcheliaddict.co.uk/align-...ngs-files.html and let me know if you find them better than the ones you are currently using.
On all my 3GX setups I go straight to these as they are what I worked out for my own model and they really smooth out the feel of the model, yet still remain 3D'able.
.

Hi Ian,
I reset and rebound the standard V1.2 settings using DIR and went flying today.
Still had the backwards drift so decided to try your settings but couldn't find your file on the laptop, must have not saved it correctly!! I did try increasing the elevator gain pot but it only made the heli oscilate backwards and forwards...

Not to be defeated, I installed the V2 firmware and gave that a go (reset the pots to 12 o'clock). Backwards drift still there and just as bad.

Going to start with a new model memory (DX7) and setup with V2 from scratch.
If this doesn't fix it then it must (?) be a faulty unit as some don't have the backwards drift.

have I missed anything?

[AlastairC]

+1 on backwards drift here. Only had about 10 flights on my 450 pro but all have been on windy days. Yesterday was the first calm day I flew it. Got v2 firmware and was just doing some hover practice. About 2 mins into each pack I have a noticeable backwards drift. See this problem is also reported on helifreak with no clear solution.... Well apart from the usual get a vbar/beastx

[tourerjim]

My 500 is perfect but 450 is perfect to begin with then develops a tail drift that become worse as the flight goes on & ive tried every thing but just cant cure.

[AlastairC]

I initially thought is was mechanical but swash is spot on level and it does not drift backwards at the start. I also have a castle esc so I can see the logs and the volts are fine and on my dx8 telemetry the receiver volts are fine. So only thing left is the unit as it heats drifts??? Anyways back to my 400 with a quark for hovering/orientation practice

[harling65]

As the drift isn't present when the heli starts its flight and only appears after a minute or so, then it suggests that the electronic components aren't stable. The hover was VERY stable before the drift effect. Maybe a QC issue as not all are affected. Align should take these back.

I have jumped ship and now run a mini Vbar which hasn't drifted on the 600.