Unintended orientation change in flight

We've had a nagging problem that has spanned multiple software releases (at least 2.7.X and 2.8.X) and multiple APMs (2 and 2.5). During flight our orientation will change somewhat randomly.  This means that going "forward" in stabilize will be a different direction that it was earlier in the flight.  We almost always fly in simple mode for all our flight modes and we see this most often when switching between modes in flight (alt hold back to stabilize, etc).  Usually we can yaw the vehicle to regain the original orientation, which tells me that the APM switched out of simple mode.  In the mission planner nothing has changed in the mode settings (still shows simple mode being checked).  We usually fix the problem by unchecking and rechecking simple mode before the next takeoff.  If I find a flight log that includes this problem, is there a place in the tlm stream that would show the simple mode status?

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • I'm experiencing this too with my new Octo, my quad and heli don't do it.  I am not flying in simple mode, just trying to hover, and I see the heading wanders around a bit, maybe +/-5°.

    I believe it's magnetic interference coming from the power system, probably the cause in your case too.

    Even if you build the 3DR quad as directed, there can be some differences in wiring layout, and even battery type, that can have an effect.

    What are your compass offsets?

  • I just posted about a similar issue. However mine consists of the copter spinning uncontrollably in the air for several seconds, before stabilizing again. However, now that you mention it, I also have the issue of yaw drifting. I did not have this problem with my older APM1.4+OILPAN setup, but I also just added FPV gear to my rig as well..

  • Developer
    I know a few people who are keen to see this in a Tlog. Can you post that here?
    Jason
  • 3D Robotics

    Sounds like magnetic interference. Any chance you can reposition things that might be causing that?

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @a1k0n: Did I get rid of hand-tuned parameters? Yes. Am I still hand-tuning more parameters? Also yes. I have a few knobs to address the…
Monday
DIY Robocars via Twitter
RT @a1k0n: I'm not going to spoil it, but (after charging the battery) this works way better than it has any right to. The car is now faste…
Monday
DIY Robocars via Twitter
RT @a1k0n: Decided to just see what happens if I run the sim-trained neural net on the car, with some safety rails around max throttle slew…
Monday
DIY Robocars via Twitter
Saturday
DIY Robocars via Twitter
RT @SmallpixelCar: @a1k0n @diyrobocars I learned from this. This is my speed profile. Looks like I am too conservative on the right side of…
Saturday
DIY Robocars via Twitter
RT @a1k0n: @SmallpixelCar @diyrobocars Dot color is speed; brighter is faster. Yeah, it has less room to explore in the tighter part, and t…
Saturday
DIY Robocars via Twitter
RT @a1k0n: I'm gonna try to do proper offline reinforcement learning for @diyrobocars and throw away all my manual parameter tuning for the…
Sep 23
DIY Robocars via Twitter
RT @circuitlaunch: DIY Robocars & Brazilian BBQ - Sat 10/1. Our track combines hairpin curves with an intersection for max danger. Take tha…
Sep 22
DIY Robocars via Twitter
RT @SmallpixelCar: Had an great test today on @RAMS_RC_Club track. However the car starts to drift at 40mph. Some experts recommended to ch…
Sep 11
DIY Robocars via Twitter
RT @gclue_akira: 世界最速 チームtamiyaのaiカー https://t.co/1Qq2zOeftG
Sep 10
DIY Robocars via Twitter
RT @DanielChiaJH: Always a good time working on my @diyrobocars car at @circuitlaunch. Still got some work to do if I’m to beat @a1k0n howe…
Sep 10
DIY Robocars via Twitter
RT @SmallpixelCar: My new speed profile for @RAMS_RC_Club track https://t.co/RtLb7TcgIJ
Sep 10
DIY Robocars via Twitter
RT @SmallpixelCar: Practiced at @RAMS_RC_Club today with my new @ARRMARC car https://t.co/AEu2hCx89T
Aug 28
DIY Robocars via Twitter
Aug 24
DIY Robocars via Twitter
RT @gclue_akira: 柏の葉で走行させてるjetracerの中身 #instantNeRF #jetracer https://t.co/giVvuE4hP7
Jul 4
DIY Robocars via Twitter
Cool web-based self-driving simulator. Click save when the AI does the right thing https://github.com/pncsoares/self-driving-car
Jul 4
More…