Neither P4P will maintain altitude

spirytus · Feb 6, 2017

Ok. I posted a video of my flight 4 posts up if you want further evidence. Good luck, let us know how it goes.

jpk1080 · Feb 6, 2017

Thank you. At this point, I think my only option is either the dealer or DJI to chime in with an idea of what could be going on. The only thing left is hardware related I would assume at this point ?

pomonabill220 · Feb 7, 2017

Strange it didn't seem to do it when traveling backwards?
That is a substantial drop in a short distance! Wonder if it would keep dropping if you continued... although it would be fatal to try.

F3honda4me · Feb 7, 2017

jpk1080 said:
That is very strange. I meant to put this up earlier. Something must have happened by going out west with these for it to affect all of them in the same exact way. How could all barometers be off like this and unable to be fixed?

Alright guys. I flew again today. Before I flew, I did a few things I haven't tried before. I reverted back to the oldest firmware possible, did an imu calibration, upgraded to the next oldest, imu calibration, and finally the newest firmware, followed by a imu calibration and compass calibration. None of this had any affect on the problems I've been having unfortunately. While I was out there, I did a few quick flights up the street. Hopefully this more accurate shows just how quick the drones are descending. I'm at a loss at this point. Thanks for looking.

Dropbox - 2-6-17

I honestly believe something happened to your all of your drones at some point during your trip that affected the barometer. My bet is all 3 need to be serviced by DJI for repair.

jpk1080 · Feb 8, 2017

I'm kind of thinking that exact same thing but have struggled to come up with what could have happened.

Techcop50 · Feb 8, 2017

jpk1080 said:
I'm kind of thinking that exact same thing but have struggled to come up with what could have happened.

Perhaps they were shipped via air in an unpressurized space, at a high altitude...?

jpk1080 · Feb 8, 2017

They went out on a semi trailer and from what I know of no issues.

Techcop50 · Feb 8, 2017

With all three affected you would assume it was a shared component, probably the barometer. Perhaps extreme temperature exposure?

AlecW · Feb 8, 2017

jpk1080 said:
They went out on a semi trailer and from what I know of no issues.

This is probably the cause, I have no idea what could have happened and you don't either but it seems like the common denominator.

jpk1080 · Feb 8, 2017

Yes I agree. I just can't imagine what could have happened to affect them all in the same way. They are all in cases and well protected. It's a semi trailer so I can't imagine things got too crazy from SC to CA. Especially something that could have caused damage in this way. I'm hoping the dealer will switch them out, but if not, I guess I will have to send them back to DJI. Explaining that problem to them may be a little difficult.

AlecW · Feb 8, 2017

jpk1080 said:
Explaining that problem to them may be a little difficult.

I was thinking that myself, they will treat this like 3 separate cases I would think.

Quinnage · Feb 8, 2017

I also have the same issue with my P4P losing height in the same situation. The drone loses approx 10% of lift when the right stick is pushed forward.

jpk1080 · Feb 8, 2017

I'm sorry to hear you're also having problems. I wish we had more answers. Did you just get yours?

bow · Feb 8, 2017

What kind of cases were they in? If it was a pelican type I wonder if the pressure relief valve in the cases were closed could have affected anything. Doubtful but just a thought

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jpk1080 · Feb 8, 2017

Just standard cases. Not air sealed or anything.

AlecW · Feb 8, 2017

When was the semi trip? Assuming winter and if so that probably eliminates excess heat.

jpk1080 · Feb 8, 2017

Yes. two weeks ago.

AlecW · Feb 8, 2017

Makes no sense. At this point we are down to Area 51 speculation! Hopefully DJI take care of it.

spirytus · Feb 8, 2017

jpk1080 said:
Yes I agree. I just can't imagine what could have happened to affect them all in the same way. They are all in cases and well protected. It's a semi trailer so I can't imagine things got too crazy from SC to CA. Especially something that could have caused damage in this way. I'm hoping the dealer will switch them out, but if not, I guess I will have to send them back to DJI. Explaining that problem to them may be a little difficult.

For the unit you posted logs, just tell them the barometer values are way off and you've done several IMU calibrations (which should reset/calibrate you baro) with no change.

By the way your IMU calibration is performed on an absolutely level surface right?

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jpk1080 · Feb 8, 2017

Thanks. I met with the dealer today. He was stumped as well. He doesn't know how to read the logs so he agreed to ship one of them off for me. When I get that one back, I will post what they found hopefully. Yes imu calibrations level in all kinds of environments just to be sure. I appreciate everyone's help.