Hello guest, if you read this it means you are not registered. Click here to register in a few simple steps, you will enjoy all features of our Forum.
This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Drift over time
#1
Hi
I'm quite new in the Hobby, but I built several quads using different FC (Emax, Naze32, F3, X-Racer)
I'm experiencing for a long time on different machines and different FC a drift left-back or right after a few minutes increasing over time and sometimes making even impossible to compensate.
This issues appears often after flipps, rolls or aggressive manoeuvres... and I happened with Naze32 rev5, F3 and a little with a collibri FC (Atom v2) on different quads, different controllers..
I don't have any problems on acro mode.
I tried so many things: PID, loop frequency, balance, rebuild, change component... reflash FC, Cleanflight, Betaflight, different versions...
It seem the issue is sometimes worse in Betaflight...
I've been told it's a Cleanflight code known issue, vibrations, ....
Okay I fly a lot in acro mode FPV, but I like to land on angle mode or fly LOS... and I like when things are working well...
You probably know this feeling too...

Any idea? Come on guys...
Reply
Login to remove this ad | Register Here
#2
If taht happens on all quads, I'd set blackbox to log on low resolution to check howis your input behaving over time - maybe you have faulty pots in gimbals, maybe they are getting hot or loose. Just guessing here.

If you are sure those are vibrations, try to soft mount fc on one of those quads.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
Reply
#3
(05-Nov-2016, 10:05 AM)KonradS Wrote: If taht happens on all quads, I'd set blackbox to log on low resolution to check howis your input behaving over time - maybe you have faulty pots in gimbals, maybe they are getting hot or loose. Just guessing here.

If you are sure those are vibrations, try to soft mount fc on one of those quads.

I mostly agree with Konrad - if it's on all quads and fc's, then it sounds like a transmitter issue.  You say there are no problems in acro mode, but maybe the problem is just not noticeable when you don't have to stay on the sticks (the same way) for maneuvers.  I can't think of anything to help really, except to borrow a friend's transmitter (and bind on a new model) and see if the problem persists. (Don't know why it would make a difference, but have you tried using a different switch for modes?) Good luck!
Reply
#4
One more thought - since it mostly happens after aggressive moves, have you eliminated the possibility that your battery may have slipped a little and changed position? A shifting CG could certainly cause that behavior.
[-] The following 1 user Likes sloscotty's post:
  • KonradS
Reply
#5
I actually don't understand why it works that way (since acc gets calibrated and saved, for a reason, no?) but the acc sensor does adjust over time. So after fast flying or hard acro it might be off quite a bit.

Or does it also happen when you are just hovering and only giving short input commands (so it mostly stays level'ed)? If so then indeed vibrations could be a problem. I think there is also a filter value for the acc in CLI, you could try to lower it a bit.
Reply
#6
I experience exactly the same in angle and horizon mode on all of my quads, no matter if I use the Taranis or Flysky (X-Racer, Naze and EVO soft mounted). Everything is fine, no drift etc.
But when I start doing flips in horizon or really aggressiv moves in angle, the quad comes back tilted.
I solve it by simply deaktivating and arming again. I thought this is normal, maybe just "confusing" the acc/gyro. But since some of you aren't experiencing those problems I start thinking of some bad habit of myself when building or programming the quad...
My quad: 
RD-210 / ZMX V3 2206 2140kv / Aikon SEFM 30A / X-Racer F303 V3 / X4R-SB / Dronelab 1500 4S 50C
Reply
#7
Luc, maybe we are, but some of us are only using acro, so no way to tell before experimenting Smile

You cant just simply confuse the acc since it measures g forces, one of them being gravity and that is persistent in staying in one direction Wink So it has to be either a damaged sensor (unlikely, since you guys have the problem on many boards), no acc calibration or sensor loosing calibration in flight (btw there is an option of inflight calibration. Never used it, maybe try that?), external forces that mess the reading (vibration, electrical noise, loose wire banging against the chip).

I had symptoms you guys describe on my first cc3d OP quad, excessive vibrations caused this, loose fc mount also helped Wink but that was a looong time ago.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
Reply
#8
I fly FPV in acro of course but I like flying LOS in horizon or angle to calm things down Big Grin
Acc calibration should not be an issue since I calibrate way to often Big Grin Transmitter mid and endpoints are exact, too.
My guess is that somehow you can exceed the limits of the acc sensor with lets say 4 flips in a row. Is it possible to change acc limits?
Perhaps some of you can set horizon mode just for fun and verify that this isn't a common problem. Please make sure to flip excessesivly Wink
My quad: 
RD-210 / ZMX V3 2206 2140kv / Aikon SEFM 30A / X-Racer F303 V3 / X4R-SB / Dronelab 1500 4S 50C
Reply
#9
I think I found the cause of the drift. Unfortunately the midpoint on pitch is quiet a bit off (1492) when I move the stick to 2000 and back. If moving to 1000 and back, midpoint is exact 1500. The other stick inputs are ok. I can not figure out how to get this right. Maybe the gimbal is faulty. I'm not sure if it is a good idea to set RC deadband to 10..

Any ideas? Anyone with similar "faulty" gimbal?
My quad: 
RD-210 / ZMX V3 2206 2140kv / Aikon SEFM 30A / X-Racer F303 V3 / X4R-SB / Dronelab 1500 4S 50C
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  New Product Lumenier Quark X7 Time-Modifying Flight Governor SnowLeopardFPV 2 371 02-Apr-2022, 12:23 AM
Last Post: sevro


Login to remove this ad | Register Here