Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

Sudden vibration during flight

Discussion in 'Pro/Adv Discussion' started by aenbacka, May 24, 2016.

  1. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    Hello,

    I was flying with my P3A today, and shooting some video. I used nd4 filter with 50fps and shutter 1/100. At one point during the flight I noticed short shaking in the video. The shaking happed twice, most of the 15 min flight everything was fine, however.

    Any ideas what could be the reason? Could some setting cause the issue? It is definitely not an issue that occurs constantly.
     
  2. bernek

    Joined:
    Apr 8, 2016
    Messages:
    271
    Likes Received:
    43
    Location:
    Romania
    Wind ?
     
    aenbacka likes this.
  3. alokbhargava

    Joined:
    Sep 28, 2015
    Messages:
    5,144
    Likes Received:
    1,660
    Location:
    San Francisco, CA
    Video may not be smooth during yaws. Any small bird hit?

    I don't think wind will shake it that much but yes sudden brakes shakes it.
     
    aenbacka likes this.
  4. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    Thanks for the info. Yes it was slightly windy. I will upload a small clip showing the vibrations.
     
  5. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    Below find the link to poisition in the youtube video which shows the vibrations. Does this give some more ideas what could have happended at that moment?



    Edit: The vibrations start at around 0:15.
     
  6. Trackman1

    Joined:
    Jan 1, 2016
    Messages:
    838
    Likes Received:
    212
    Location:
    Ontario, Canada
    I had something similar. One of the 4 gimbal cushions had become loose.
     
    aenbacka likes this.
  7. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    What is the easiest fix for that? Does it require replacement?
     
  8. alokbhargava

    Joined:
    Sep 28, 2015
    Messages:
    5,144
    Likes Received:
    1,660
    Location:
    San Francisco, CA
    Gimbal vibration pads should be free to hold the gimbal. Two diagonal pins also should not restrict the motion. Check if all the 4 pads are properly sitting.

    Also check if any external material is restricting the yaw motor free movements.
     
    aenbacka likes this.
  9. DennyBoBenny

    Joined:
    Aug 24, 2015
    Messages:
    127
    Likes Received:
    31
    My P3A does the exact same thing, very random. I've had it do it when it was windy, no wind, flying forward not yawing. I've checked the pads and they look good to me. I wonder if it's an electrical problem causing the gimbal motor to twitch. It doesn't do it enough to concern me...it's nothing to do with the a/c, just the gimbal.
     
    aenbacka likes this.
  10. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    Yes it is indeed very random. I did another video yesterday using Autopilot waypoints, and that video does not show any vibrations.
     
  11. DUIEUMERCI

    Joined:
    May 4, 2016
    Messages:
    18
    Likes Received:
    1
    If it' s not caused by wind, bird hit ,...you should try recalibrating your IMU
    But first be sure you turned your Dji P3 OFF , at least 5 minutes before doing recalibration


    Best are yours
     
    aenbacka likes this.
  12. SnoozeDoggyDog

    Joined:
    Jun 13, 2015
    Messages:
    489
    Likes Received:
    97
    I always have my brakes set to 70%
     
  13. WetDog

    Joined:
    Oct 18, 2015
    Messages:
    1,491
    Likes Received:
    640
    What is with this 'recalibrate the IMU' meme that is popping up? No, this NOT AN IMU ISSUE. If you get an "IMU error", recalibrate it. If your Phantom takes forever to warm up, calibrate the IMU in a colder environment. Otherwise leave it alone.
     
    snowghost likes this.
  14. band318

    Joined:
    Mar 21, 2016
    Messages:
    55
    Likes Received:
    10
    Location:
    Munich, Germany
    I have had similar due to a sudden gust of wind.. Another reason could be props hitting a big bug/insect in flight..

    Did you notice any tiny red dots of blood on the props or body?
     
    aenbacka and Reed L like this.
  15. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    I did not notice any blood dots, just checked. It was slightly windy so it could have impacted.
     
  16. SteveAikens

    Joined:
    May 17, 2015
    Messages:
    203
    Likes Received:
    57
    Location:
    Clovis, NM
    As noted earlier - looks like dampers issue. Use only two pins, make sure the ones on the gimbal are seated properly.
     
    aenbacka likes this.
  17. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    Took some photos of my dampers setup, did not seem to be too loose.

    [​IMG]

    [​IMG]

    Anything strange?
     
  18. SteveAikens

    Joined:
    May 17, 2015
    Messages:
    203
    Likes Received:
    57
    Location:
    Clovis, NM
    Not that I see - other than a little dirt that you can blow off it.

    No idea now.
     
  19. Not A Speck Of Cereal

    Joined:
    Mar 8, 2016
    Messages:
    404
    Likes Received:
    145
    Don't use 4 dampers! The design is for using only 2. You get an extra 2 with your bird, but that's only to replace the installed ones if they wear or get stiff.

    Also: the gimbal only works for so many degrees. The wind can knock it past that tolerance. However, if you're using 4 dampers, my advice is to try it with 2 before worrying about wind.
     
  20. aenbacka

    Joined:
    Sep 7, 2015
    Messages:
    60
    Likes Received:
    6
    All four were mounted upon purchase, you mean that I should remove two of them? There were also spare dampers included in addition to the mounted ones.