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Yaw Instability

Discussion in 'Phantom 2 Discussion' started by ianwood, Sep 22, 2014.

  1. ianwood

    ianwood Taco Wrangler
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    It's like a car with an alignment problem. The Phantom will not hold a heading consistently.

    Either some firmware after 3.04 and/or the H3-3D introduced an un-commanded yaw problem. The whole Phantom will rotate up to 10 degrees without any input. It won't hold a track consistently and when trying to aim a shot, it will lag badly. It is particularly bad when:

    • yawing while stationary
    • initiating a forward movement
    • descending (even at 0.5m/s)
    • coordinated yawing and rolling
    • flying forward into a wind
    The gimbal will also track off center in a number of shots, mostly to the left. Raising the yaw gain does little to fix either issue and lowering it makes it sloppy. I suspect the whole issue is gimbal related but most of the un-commanded yaw is being done by the Phantom.

    Hitting 10.7v early wouldn't be so bad if I knew I had the shot. This is ruining shots.

    DJI, you should be paying me to beta test your products.
     
  2. Buckaye

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    I would take the gimbal off and see if you still are having the problem - at least that might help narrow it down to your Gimbal theory.

    Is it a new H3-3D?

    Have you been in a crash recently?

    Are all the motors at an equal heat when you land?
     
  3. AerialCinemaGuy

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    Advanced IMU cal after installing gimbal??
     
  4. gruvpix

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    I've always had the same problem, never with my Phantom 1 though. It won't track forward and combination yaw/roll movements are very tricky to get just right because you have to compensate for the instability you mentioned. I tried messing with the gains to no avail, too high and the thing is twitchy, too low and it's sluggish.
    Here's hoping someone has a suggestion on how to fix. Combined with my bird landing at about 60% battery life across all of my batteries, I'm starting to think this thing needed quite a bit more testing before being released to market.
     
  5. ianwood

    ianwood Taco Wrangler
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    IMU advanced calibration done. No crashes. H3-3D seems to otherwise work fine. It's balanced. It doesn't flop or kick. If someone has an H3-3D / P2 that doesn't do that, I'd like to compare settings. I suspect it's either a setting or firmware issue.
     
  6. skeeter

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    Can you roll back to 1.08?
     
  7. ianwood

    ianwood Taco Wrangler
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    Rolling back means J hook. No thanks.
     
  8. skeeter

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    Yeah...kinda figured. ..was thinking just for experimental value....
     
  9. ianwood

    ianwood Taco Wrangler
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    Concerned that if I roll back to test if that fixes it, I may break something else. Would rather hear from others what they have that is different that makes theirs work better if that actually is the case.
     
  10. Buckaye

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    Mine doesn't have this problem... which settings are you interested in comparing? I can try to look it up when I get home later.
     
  11. ianwood

    ianwood Taco Wrangler
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    That would be really helpful. Let's start with firmware versions and gains. Basically screenshots of the "view" and "upgrade" tabs in the P2 assistant.