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Problem on take-off

Discussion in 'Pro/Adv Discussion' started by Roaddogg, May 22, 2016.

  1. Roaddogg

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    After flying several locations with my P3P today with no problems ... Towards the end of the day, every time I took off it seemed to pull really bad and not hover well. Any suggestions? Thanks.


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  2. konidair

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    Have you tried to upload your logs on Healthydrones and look for errors(or better post it here)?
     
  3. Roaddogg

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    Very new flyer and not sure how to upload to healthydrones or here... Sorry, I have no experience with these procedures (I probably should learn this).


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  4. konidair

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    It's ok to be new, I consider myself a new flyer too :)
    I learnt about Healthydrones from this forum and I believe uploading the flight log should be the first thing to do when troubleshooting drone issues. Depending on the hardware and software you use there a few different ways for uploading your flight logs but don't worry, it's all explained here: HealthyDrones.com - Innovative flight data analysis that matters
     
  5. FantomFlier

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    You need to provide a bit more information - describe what you mean by "pull really bad" and "not hovering well". What are the symptoms?

    An observation: One thing which may be affected by "several locations" is the compass, which in turn could affect hover stability.
     
  6. Roaddogg

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    Thanks for the replies. The first problem I noticed was that the bird drifted hard to the left right after auto takeoff. I shut her down and when I tried again it was a bit better but was drifting towards me. After I got it up I noticed that it seemed to be pulling to the left a bit and I was fighting with it to keep it stable. After that I changed locations and did a quick test and after takeoff it was again drifting towards me. FYI - I do believe that I got a quick message saying something like ... compass problem - move to another spot (which I did and got a safe to fly).


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  7. Kima kim

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    I guess you need to calibrate the compass before you fly it on it's maiden flight and from every other new location.
     
  8. Mimoid

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    1) Compass calibration? Read up on how and when to do this. I would think that this is the main cause for the issue you are experiencing,

    2) Wind? Sometimes wind gusts can make the Phantom struggle really hard to stay in one place, specially if you are hovering low.

    3) Satellite locks? You are not accidentally flying in Atti mode, are you? Make sure that you have at least 8-9 satellites, the screen says something like "P-GPS Safe to fly", and the indicators on the aircraft are blinking slowly in green.

    //Tom
     
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  9. Mimoid

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    Do not recalibrate on every new location. If you once have achieved a good and solid calibration, there is absolutely no need to calibrate the aircraft again (unless you have travelled really far, like 100 km or more).

    Quite the contrary, a compass calibration should be approached with the uttermost caution - it should not be done unless absolutely necessary, and should always be followed by a dedicated and strictly controlled test flight afterwards. I would think that the majority of the reported flyaways with the P3 can be attributed to incorrectly performed compass calibrations.

    //Tom
     
    #9 Mimoid, May 23, 2016
    Last edited: May 23, 2016
    GenesisX and PEEFA like this.
  10. msinger

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    You'll see more information in your log if you upload it to my log viewer instead.
     
  11. SteveAikens

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    What is "cell deviation" and what does it mean?
     
  12. CCDD

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    I just went through a very similar issue on a "brand new" replacement P3P from DJI. Ended up having to send it back for a replacement again and finally, all is set. Not matter where I attempted to fly. it was going left right after takeoff and had to immeidately land to avoid a catastrophe. No compass calibration or IMU cal. did anything to alleviate issue.
     
  13. Mimoid

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    It's abnormalities in the battery cells (there are four cells in the Phantom Intelligent Battery). Minor deviations may be appearing already from start and will be increasing with age. They are quite normal. Major deviations should not occur.

    //Tom
     
    #13 Mimoid, May 23, 2016
    Last edited: May 23, 2016
  14. Roaddogg

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    Thanks for the good info... I will upload the flight log sometime tonight. I have one more question... Is it safe to do calibrations (IMU, Compass, and Gimbal, or for that matter firmware updates) with the PolarPro filter? Man, I'm getting paranoid!!


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  15. Mimoid

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    Yes, could have been a defect in the motors, the FC, or the sensors. Not easy to know... But the main thing is that it is fixed!
    Filters should not be a problem, but make sure that the Phantom is as level as possible during IMU and gimbal calibration. I usually remove the propellers, place a glass pane on the propeller shafts (from an IKEA picture frame) and use a spirit level on this glass pane to make sure that the Phantom is completely horizontal in each direction. If there is a slight tilt, I just put pieces of paper under the landing gears to level them out.

    Also, try to make sure not to have a too high ambient air temperature while doing the IMU calibration, otherwise the Phantom will need to warm up to that temperature on consecutive startups for the self-checks, which might take a lot of time. You really don't have to put the Phantom into the freezer, just strive for roughly the same ambient air temperature as what will be normal for your flying.

    //Tom
     
    #15 Mimoid, May 23, 2016
    Last edited: May 23, 2016
  16. SteveAikens

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    Thanks Tom. It appears it's not a real concern in my case. I have a few [red] deviations shown in the report but then they go on just fine. Interesting.
     
  17. Roaddogg

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    Thanks


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  18. xave

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    Does this occur with and without vps on?
     
  19. Roaddogg

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    I believe on... I've never changed the VPS setting from what it is set for out of the box.


    Sent from my iPod touch using PhantomPilots mobile app