Help: Taranis QX7 Stick Problem


#1

So something weird has been happening with my flights. I recently noticed that after a couple flips and rolls my brushless quadcopter would start drift rolling to the left.

I initially thought it was the gyro going bad, but I just did a flight with stick overlay (from Taranis logging, not blackbox logging) and I noticed that my roll stick is off center after a couple flips. During this test, I took my thumbs off the roll stick for this part.

Here’s a video of this issue (starting at 2m14s for problem):

Why would this happen and how can I fix this? Is my controller breaking because this makes no sense to me.


#2

Do it again and check what the QX7’s values page says your sticks are at while the quad is wanting to roll. That’ll narrow down which end the issue is on.


#3

I’ll check that tomorrow. Thanks!


#4

The QX7 values page says -1 most of the time and sometimes -2 or -3 on the aileron stick when the quadcopter wants to roll.

I’m pretty sure I can just increase the aileron deadband on betaflight, but is there any way that I can fix this issue correctly? I got my QX7 from getFPV so I thought it wouldn’t break so quickly (<200 hr flight time and no drops).


#5

Did you try to recalibrate your transmitter


#6

I’ll try that, but would calibration just fix the center point?

It seems like if I go from left aileron to center I get a constant -1 or -2 on center, but if I go from right aileron to center I get 0 on center. Do I have to open my QX7 and clean the pots maybe?


#7

Sounds like the centering spring might need tightening if the stick can wobble, if the stick can’t wobble then that gimbal has some sort of issue.
That said, 3 points of dead band will do the trick too.

Start off by calibrating sticks though.


#8

So I just got back from another flying session.

I calibrated the sticks between flights and the issue got worse (-10 drift) then better (-3 drift) then worse again (-7 drift). The sticks don’t have any wobble around center stick.

I guess now it’s about 7 points deadband though I really wish I could fix my gimble…


#9

If you don’t have the hall effect gimbals they’re a nice upgrade, this might be a good excuse.

Sounds like the potentiometer on that stick isn’t well attached to the gimbal.


#10

@Imozeb Did you ever get to the bottom of this? I’ve had the QX7 for about 3 months and now getting EXACTLY the same issues as you. Even drifting in the same direction…


#11

I just used like 10 deadband in Betaflight. Not the most elegant solution, but it works till I upgrade to hall gimbals.


#12

Thanks.
So you do think it is a physical issue that upgraded gimbals will fix? At least with mine, the stick is always dead centre, whether reading 0 or -7


#13

Yeah. It’s the potentiometer that’s wearing out.

I’m decently sure of this because I have the habit to turn left over right and the gimbal is wearing out on the left side command. Haha!


#14

Thanks for the feedback