Ok, I was flying yesterday, and had an IMU issue and my aircraft did not fly straight.

http://forum.dji.com/thread-90680-1-1.html

So today, I did a new IMU, camera, compass, RC, and vision sensors calibration.  I went to go fly and I'm still have the issue of the P4P NOT flying in a straight line.  It veers off to the left as it moves forward and then when I reverse it...it veers off to the right (camera still facing away from me).

Has anyone else had this issue?  Can anyone else please test theres and see if there P4P will veer off to the right or left?  Any one have any suggestions that may help in getting it to fly stright?

Thanks in advance

Hi. Have you calibrated your controller - perhaps the sticks aren't centred properly?

Tell us about the cross wind.

May I know how long you've owned it? You've installed the latest firmware, right?
I replied your original thread as well, please follow up it there, thanks.

Mark The Droner Posted at 2017-3-30 16:28
Tell us about the cross wind.

Yes, that is the first thing I considered... with the GPS not working because of weak signal, it might be the most probable cause...

Punchbuggy Posted at 2017-3-30 16:04
Hi. Have you calibrated your controller - perhaps the sticks aren't centred properly?

Yes, that was part of what I did to try and correct this.

Mark The Droner Posted at 2017-3-30 16:28
Tell us about the cross wind.

No cross wind.  If anything, now that I think about it, there was a breeze coming from behind, maybe about 1 to 2 MPH.  

DJI Natalia Posted at 2017-3-31 02:16
May I know how long you've owned it? You've installed the latest firmware, right?
I replied your original thread as well, please follow up it there, thanks.

DJI-Natalia,  I have owned it for about 6 months and yes I have the latest firmware.  I will reply back to the original thread soon.  Thanks.

Antonio76 Posted at 2017-3-31 02:50
Yes, that is the first thing I considered... with the GPS not working because of weak signal, it might be the most probable cause...

Agreed, thought about that as well BUT when I let off on the RC command it would stop and hover AND it appeared to drift back to were it was suppose to be if it had not veered off in the first place.  17 satellites, RC bars were in the red with 1 indicating.  Hummm, not sure what to make of it.

What about the compass calibration?  Are you sure you did it correctly - meaning away from metal objects including rebar in the pavement and you didn't have a cell phone or bunch of keys in your pocket, etc....?  

Mark The Droner Posted at 2017-3-31 04:10
What about the compass calibration?  Are you sure you did it correctly - meaning away from metal objects including rebar in the pavement and you didn't have a cell phone or bunch of keys in your pocket, etc....?

Correct.  I have done this correctly.  VERY particular when it comes to re-calibrating my quads.  Open field, no concrete, metal fences, cell phone, pocket knife, keys, etc.  I am sure I did it correctly and thanks for double checking.

Also, I had a P4 and I remember it was a MAJOR issue of the aircraft going up in altitude for a while before DJI corrected it with a firmware update.  There were so many feeds in this forum and complaints, but after the update...no longer had that issue when I had my P4.

I can only assume that this is similar issue...just in a different direction.

ProQuad Posted at 2017-3-31 05:49
Also, I had a P4 and I remember it was a MAJOR issue of the aircraft going up in altitude for a while before DJI corrected it with a firmware update.  There were so many feeds in this forum and complaints, but after the update...no longer had that issue when I had my P4.

I can only assume that this is similar issue...just in a different direction.

Same issue, second P4P, calibrations do not help.

epicjib Posted at 2017-3-31 10:41
Same issue, second P4P, calibrations do not help.

Well the issue then was the P4's would go up in altitude and not veer off left or right, but...same issue

Let me ask this? Did it fly straight before the IMU Cal?

Rodger8 Posted at 2017-3-31 13:58
Let me ask this? Did it fly straight before the IMU Cal?

No it did not...that is why I did the calibration.  It didn't fix it so then I posted here to get additional help.  DJI-Natila is looking into it for me.  I just have to send her my flight logs.

ProQuad Posted at 2017-4-1 07:00
No it did not...that is why I did the calibration.  It didn't fix it so then I posted here to get additional help.  DJI-Natila is looking into it for me.  I just have to send her my flight logs.

I had an issue where mine flew straight until I did my first IMU cal and then after the cal it drifted to starboard.  Your issue may be the speed controller because it changes direction between forward and reverse. Just a thought.

I have also experienced this issue..
One thing to test is with a different set of props as unbalance props can result in drone not flying straight.

I also have found when EXP settings are tweaked lower it doesn't fly as straight as when they are set back to default .4 (not sure if u have changed these but I did an noticed a difference)

Mine would fly slightly left going forward and slightly right going back in gps mode and Atti mode. It seems a little better now with EXP back to default and new set of props

Rodger8 Posted at 2017-4-2 01:08
I had an issue where mine flew straight until I did my first IMU cal and then after the cal it drifted to starboard.  Your issue may be the speed controller because it changes direction between forward and reverse. Just a thought.

Thanks for your input.  Still not sure what to do.  DJI-Jamie is looking into this for me.  Hoping she can let me know what I need to do from this point

airspace_media Posted at 2017-4-2 04:52
I have also experienced this issue..
One thing to test is with a different set of props as unbalance props can result in drone not flying straight.

Props.  Yep did that too.  Changed the porps to a new set.  No difference.
I did, however, change the EXP and other settings trying to tweak it...I'll try setting it back to normal.  Thanks for the input.

ProQuad Posted at 2017-4-2 05:47
Thanks for your input.  Still not sure what to do.  DJI-Jamie is looking into this for me.  Hoping she can let me know what I need to do from this point

most likely send it in to be checked.

Rodger8 Posted at 2017-4-3 03:18
most likely send it in to be checked.

Yep, this is what I am thinking myself.  I have my mavic in the repair shop now so this would leave me with my I1 pro...

ProQuad Posted at 2017-4-3 04:34
Yep, this is what I am thinking myself.  I have my mavic in the repair shop now so this would leave me with my I1 pro...

Sounds like you really like flying. My new P4P is supposed to be delivered today.

Rodger8 Posted at 2017-4-4 00:07
Sounds like you really like flying. My new P4P is supposed to be delivered today.

Yes,  I fly as much as I can.

ProQuad Posted at 2017-4-4 03:37
Yes,  I fly as much as I can.

I think that no one actually asked this in the thread but do your motors spin with the same amount of friction?
I had the same issue myself
My P3P wouldn't fly in a straight line
After checking the motors I've seen that one of them took more force to spin with my hands
I yet have to replace it but that's probably the issue

ProQuad Posted at 2017-4-4 03:37
Yes,  I fly as much as I can.

It is fun. I am starting again now that winter is over. Have been catching a nice day here and there lately. I am in RI on the East Coast.

Phantom3ProPilo Posted at 2017-4-4 04:50
I think that no one actually asked this in the thread but do your motors spin with the same amount of friction?
I had the same issue myself
My P3P wouldn't fly in a straight line

Good idea, and I just check and all motors are spinning with no effort.

Rodger8 Posted at 2017-4-4 05:18
It is fun. I am starting again now that winter is over. Have been catching a nice day here and there lately. I am in RI on the East Coast.

Colorado here and between work and snow/rain...I get out and fly

ProQuad Posted at 2017-4-4 15:20
Colorado here and between work and snow/rain...I get out and fly

I am in New England and we get some nice days and then wet ones. My new P4P came yesterday and with my luck it will rain for the next month now.

Rodger8 Posted at 2017-4-5 04:13
I am in New England and we get some nice days and then wet ones. My new P4P came yesterday and with my luck it will rain for the next month now.

LOL...I know about about the weather in England area.  Good luck

DJI Natalia Posted at 2017-3-31 02:16
May I know how long you've owned it? You've installed the latest firmware, right?
I replied your original thread as well, please follow up it there, thanks.

DJI-Natalia,  
I have posted this and another issue on my other feed:


http://forum.dji.com/forum.php?m ... mp;extra=#pid757375

All flight records have been synced to the server.
Please look at:
29/3/17 18:35:10 @ the 10 min. left received several errors

29/3/17 18:46:28 no GPS, IMU issue (received MANY of these errors.  I think this was when it first started)
29/3/17 18:47:34 does NOT fly in a straight line
29/3/17 22:01 does NOT fly in a straight line
30/3/17 15:14:26 does NOT fly in a straight line
30/3/17 15:18:41 does NOT fly in a straight line
30/3/17 15:21:33 does NOT fly in a straight line
30/3/17 15:23:45 does NOT fly in a straight line
30/3/17 15:37:21 does NOT fly in a straight line
30/3/17 15:39:50 does NOT fly in a straight line

Did a COLD IMU calibration, RC calibration, camera calibration and GPS calibration

5/4/17 19:07:53 does NOT fly in a straight line
5/4/17 19:11:26 does NOT fly in a straight line

ProQuad Posted at 2017-4-6 04:07
DJI-Natalia,  
I have posted this and another issue on my other feed:

Thanks, I got it and forwarded it to the data analysis team again.

Please see this post for how I was able to correct the issue of my P4P NOT flying straight.  This worked and have and ZERO issues since then.

http://forum.dji.com/forum.php?m ... D386%26typeid%3D386