Welcome to InspirePilots.com

Join the leading DJI Inspire community for free!

Drifting

Discussion in 'Inspire 1 Discussion' started by jonathnsmith, Jan 17, 2015.

  1. jonathnsmith

    Joined:
    Jan 12, 2015
    Messages:
    76
    Likes Received:
    44
    Location:
    Chattanooga, TN
    Forgive me for my ignorance if someone else has posted a thread similar to this. I'm a fairly new and inexperienced pilot. I've had less than 5 flights on a Phantom 2 and 2 flights on the inspire. I get that I'll learn how it handles the more I fly it but I'm trying to figure out what's to be expected in the different modes.

    I've read some people talking about how the inspire the inspire stays completely still for them but mine seems to drift slightly. I've only used the default P GPS mode. Is this just something that drones do or am I doing something wrong?
     
  2. Tahoe Ed

    Joined:
    Dec 18, 2013
    Messages:
    426
    Likes Received:
    251
    What version of the firmware are you on. You need to upgrade to v.16 if you are not there yet.
     
  3. jonathnsmith

    Joined:
    Jan 12, 2015
    Messages:
    76
    Likes Received:
    44
    Location:
    Chattanooga, TN
    I'm using the latest firmware and app. I did the IMU calibration before I flew.
     
  4. DaBone

    Joined:
    Jan 11, 2015
    Messages:
    406
    Likes Received:
    96
    Location:
    Sweden
    Did you have a compass calibration before also?

    If you do a compas calibration on a leaning table, you can get a drifting drone.
    Make sure you have a table, that are level.
     
  5. lrwskyfilms

    Joined:
    Nov 17, 2014
    Messages:
    668
    Likes Received:
    208
    The IMU calibration needs a flat and level surface, the compass calibration is 2 x 360 degree rotations.
     
  6. DaBone

    Joined:
    Jan 11, 2015
    Messages:
    406
    Likes Received:
    96
    Location:
    Sweden
    That´s right. My fault.

    Doing bookkeeping at the same time, so it's a bit much in my head right now. :)
     
    lrwskyfilms likes this.
  7. lrwskyfilms

    Joined:
    Nov 17, 2014
    Messages:
    668
    Likes Received:
    208
  8. jonathnsmith

    Joined:
    Jan 12, 2015
    Messages:
    76
    Likes Received:
    44
    Location:
    Chattanooga, TN
    Isn't the compass calibration mandatory before each flight? I do it each time because I thought that's what I was supposed to do.

    A friend of mine is building a web site for a church and wanted me to grab some footage for them. This was the first time that the inspire pretty significantly drifted. I took control as it started to drift towards that lamp post but otherwise all i did was do the auto take off. Also despite it being less than 150 feet up and within line of sight, it just freaked out on me at some point and lost all GPS even though I had full bars. It recovered and acted like nothing happened. I'm not sure if the gimbal moved or the entire drone moved but you can see it just jerking suddenly. Is this normal?



    Edit: I should also note that there was basically no wind. It was very minimal so its not cause of wind.
     
  9. shockwave199

    Joined:
    Dec 24, 2014
    Messages:
    168
    Likes Received:
    40
    No, that is not normal compared to many other smooth flights I've seen.
     
  10. jonathnsmith

    Joined:
    Jan 12, 2015
    Messages:
    76
    Likes Received:
    44
    Location:
    Chattanooga, TN
    Well that's no good. Any suggestions @Tahoe Ed or anyone else? Should i calibrate the IMU again?
     
  11. Quadpilot

    Joined:
    Jul 16, 2013
    Messages:
    624
    Likes Received:
    308
    Location:
    Chaska, MN
    Calibrate the IMU on completely level surface. After cal check the sensor values for confirmation: From top to bottom should be 0.00 (0.01 var) 1.00 (0.01 var) 1400-1600. Do the compass calibration away fro any known magnetic disturbances, like rebar in cement. Even your cell phone in your pocket can be a problem. Do the compass dance every time you change flying location. IMU cal, once good, doesn't need to be repeated unless app tells you.
     
    #11 Quadpilot, Jan 18, 2015
    Last edited: Jan 18, 2015
  12. jonathnsmith

    Joined:
    Jan 12, 2015
    Messages:
    76
    Likes Received:
    44
    Location:
    Chattanooga, TN
    I recalibrate the IMU in my closet last night and just took a screen shot of the settings. In theory this is good?
     

    Attached Files:

  13. Quadpilot

    Joined:
    Jul 16, 2013
    Messages:
    624
    Likes Received:
    308
    Location:
    Chaska, MN
    It's all good! Don't forget compass cal. Happy Flying. Let me know how it turns out.
     
  14. jonathnsmith

    Joined:
    Jan 12, 2015
    Messages:
    76
    Likes Received:
    44
    Location:
    Chattanooga, TN
    Will do. I'm on a (non-aerial) shoot all day so I won't get a chance to fly it til tomorrow. I do remember when I was calibrating the IMU last night it was definitely showing in the 1300s for the mod for the compass so maybe that was the problem.
     
  15. jonathnsmith

    Joined:
    Jan 12, 2015
    Messages:
    76
    Likes Received:
    44
    Location:
    Chattanooga, TN
    I still find it drifting or rotating some on its own. Not nearly as bad as it was in that video though. Is that normal?
     
  16. Tahoe Ed

    Joined:
    Dec 18, 2013
    Messages:
    426
    Likes Received:
    251
     
  17. Tahoe Ed

    Joined:
    Dec 18, 2013
    Messages:
    426
    Likes Received:
    251
    That is not normal but what I am seeing that you are getting some TBE in your flight. I have been able to fly out of that and have the FC correct the situation. Do your IMU calibration again and then do the compass calibration before you fly. I am assuming that you already did your Tx calibration.
     
  18. thumpinhard

    Joined:
    Aug 12, 2014
    Messages:
    319
    Likes Received:
    45
    Location:
    GUerneville Ca.
    Ed,can you clarify your abbreviations for those who may not know?
    thanks.
     
  19. johnmont250

    Joined:
    Dec 30, 2014
    Messages:
    256
    Likes Received:
    100
    Tbe- toilet bowl effect
    Fc- flight controller
    Imu- internal measurement unit
    Tx-radio controller/sticks
     
    #19 johnmont250, Jan 20, 2015
    Last edited: Jan 20, 2015
  20. Tahoe Ed

    Joined:
    Dec 18, 2013
    Messages:
    426
    Likes Received:
    251
    Thank you!