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Relative altitude raise with our reason while in fixed hovering

Posted by ActionDrone on July 9, 2016 at 3:00am

Hi all,

I'm doing all the necessary experimental flights in order to register it with my aviation authority.

During the hovering duration test (endurance) in loiter mode, I noticed that the relative altitude on APM Planner (Mac) in 30 minutes raised from 0,4 metres up to about 11 metres, despite I kept the AGL altitude between 1 and 3 metres.

Can you help me understanding why this happens? It's not the first time.

  • 3DR Pixhawk
  • Copter 3.3
  • uBlox M8N

Thanks.

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Replies

  • Andre K. July 20, 2016 at 1:36pm

    Are you kidding me ?

    :) 

    it's holding altitude just fine, that is, except for now-and-then RC input that commands it higher, ... 

    Screenshot from 2016-07-20 22-33-49.png

    https://storage.ning.com/topology/rest/1.0/file/get/3702271139?profile=original
  • ActionDrone July 14, 2016 at 12:33am

    You're right, sorry. Here we are with the correct BIN file.

    Please allow some minutes from this message to finish the upload to the Dropbox folder. It's 21 MB.

    https://dl.dropboxusercontent.com/u/578022/2.BIN

    Thanks for your support.

  • Andre K. July 12, 2016 at 11:59am

    The attached log is 9 minute (not 30 min flight)

    you flew for a short while to 39 meters, going there does not seem to have uswd lots of throttle.

    All seems "normal" , in terms of barometric pressure vs altitude,  - so unless you actually like the log says, then you build is doing seriously bad stuff to the air pressure around the pixhawk. 

  • ActionDrone July 11, 2016 at 12:36am

    Didn't know that the BIN was better. Sorry, beginner's error :)

    I attach the file. thanks.

    3.BIN

  • Andre K. July 10, 2016 at 6:00am

    much better, and RAW sensor data is in the .BIN, also, at much higher rate...  maybe you can find that ?

  • ActionDrone July 10, 2016 at 5:48am

    You're right. Here I have the tlog only.

    2016-07-09 16-01-40.tlog

  • Andre K. July 10, 2016 at 4:04am

    I would guess autopilot got bored.  - In case you wish something else than stupid guesses, you need to post .BIN log.  :)

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