Yaw Instability

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.
 
ianwood said:
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.


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?
 
Advanced IMU cal after installing gimbal??
 
ianwood said:
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.

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.
 
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.
 
Can you roll back to 1.08?
 
ianwood said:
skeeter said:
Can you roll back to 1.08?

Rolling back means J hook. No thanks.

Yeah...kinda figured. ..was thinking just for experimental value....
 
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.
 
ianwood said:
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.

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.
 
Buckaye said:
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.

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.
 

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