I am asking for your opinion on what is the cause of this uncontrollable crash.
There is no pilot error.
We are not able to figure out the cause of this crash.
We assume that the thrust is lost in the sunroof, but there are still uncertainties here...

Can't really tell from the video.  If you want to learn what your flight data tells about your incident ...

Go to: https://www.phantomhelp.com/LogViewer/Upload/
... where you'll find instructions to upload the data to that site and it will give a report.

For help interpreting the data you can post a link for the report here.   Or just post the .txt file.

There are members here who can review the data give an explanation as to why the incident occurred.  

Hello there VideoLife_FPV. I am sorry for the trouble this has caused and thank you for reaching out. Since this unfortunate event happened . I would recommend for your to contact our DJI Support Team at https://www.dji.com/support?site=brandsite&from=nav for further assistance. We will do our best to help you and give out the best resolution for the said issue. Again, I am sorry and thank you.

DowntownRDB Posted at 8-7 12:55
Can't really tell from the video.  If you want to learn what your flight data tells about your incident ...

Go to: https://www.phantomhelp.com/LogViewer/Upload/

I was trying to upload a .csv file generated by https://djitelemetryoverlay.com/srt-viewer/, however, it keeps giving me an "error" on this page you sent me.
Here is my .srt and .csv file, so if someone can find a solution, I would be glad.

https://easyupload.io/xjznrq
(files will expire in 30 days)

DJI Stephen Posted at 8-7 20:58
Hello there VideoLife_FPV. I am sorry for the trouble this has caused and thank you for reaching out. Since this unfortunate event happened . I would recommend for your to contact our DJI Support Team at https://www.dji.com/support?site=brandsite&from=nav for further assistance. We will do our best to help you and give out the best resolution for the said issue. Again, I am sorry and thank you.

No problem!
Thank you sir, I have sent an inquiry.
Have a nice day!

VideoLife_FPV Posted at 8-7 23:42
I was trying to upload a .csv file generated by https://djitelemetryoverlay.com/srt-viewer/, however, it keeps giving me an "error" on this page you sent me.
Here is my .srt and .csv file, so if someone can find a solution, I would be glad.

That csv file is not flight data and has nothing that helps understand your incident.
It just has information about each photo you shot during the flight.

Labroides Posted at 8-8 04:27
That csv file is not flight data and has nothing that helps understand your incident.
It just has information about each photo you shot during the flight.

Ok, thanks for the info.
Could you please tell me how to get this informations (flight data)?

VideoLife_FPV Posted at 8-8 04:55
Ok, thanks for the info.
Could you please tell me how to get this informations (flight data)?

I've never used or seen the FPV, but if its app is like the ones that other DJI drones use, you might be able to work it out from the instructions that work for them.

Go to: https://www.phantomhelp.com/LogViewer/Upload/
... where you'll find instructions.
That will give a report you can post a link for the report here.
Or just post the .txt file.

taking off on a glass?  reflective surface?  perhaps it didn't register altitude properly.

great looking place, not sure i'd put an FPV up there though

Labroides Posted at 8-8 05:19
I've never used or seen the FPV, but if its app is like the ones that other DJI drones use, you might be able to work it out from the instructions that work for them.

Go to: https://www.phantomhelp.com/LogViewer/Upload/

Thanks buddy, I tried that before but unfortunately after uploading the .csv, the app throws an error….

chillibadger Posted at 8-8 05:21
taking off on a glass?  reflective surface?  perhaps it didn't register altitude properly.

great looking place, not sure i'd put an FPV up there though

On the left side is glass, and the drone took off from the metal part of the roof. But it's possible that the proximity sensor slowed the engines... but also that the thrust went through the open sunroof...
I flew in N mode, and it's impossible to fall, unless I'm drunk

VideoLife_FPV Posted at 8-8 05:28
Thanks buddy, I tried that before but unfortunately after uploading the .csv, the app throws an error….

The CSV file you posted isn't recorded flight data.
You are looking for a .txt file ... not a CSV file.

And launching from a steel surface like a car roof is asking for trouble with a yaw error causing uncontrollable flight.
The theory about the sunroof affecting thrust is implausible.

The .txt and .DAT log files can be retrieved from the goggles. To see how to do this take a look at

https://fpvdronepilots.com/threads/dat-available.4225/

Can you provide the .txt and/or the .DAT for this flight? You will need to use a public sharing site like DropBox or GoogleDrive.

BudWalker Posted at 8-8 06:49
The .txt and .DAT log files can be retrieved from the goggles. To see how to do this take a look at

https://fpvdronepilots.com/threads/dat-available.4225/

Thanks bro.
Here is result --> https://www.phantomhelp.com/logviewer/8P8QPCWANUHEO2G09R5S/

VideoLife_FPV Posted at 8-9 00:51
Thanks bro.
Here is result --> https://www.phantomhelp.com/logviewer/8P8QPCWANUHEO2G09R5S/

Hi VideoLife_FPV

Landing(Vertical Low Limit}







Check this page for reason Post#12

https://forum.dji.com/forum.php?mod=viewthread&tid=269699

VideoLife_FPV Posted at 8-9 00:51
Thanks bro.
Here is result --> https://www.phantomhelp.com/logviewer/8P8QPCWANUHEO2G09R5S/

In summary the FPV's Flight Controller thought the FPV was ascending when in fact it wasn't. This caused the FC compensate by commanding the FPV to descend.

There is good agreement between the ultrasonic height (green) and the video at 1) the first bump with the car roof, 2) the increase in ultrasonic height when the FPV moves from being over the car roof, and 3) the second bump with the asphalt. Also seen is the steady increase of the FC height (red) to about 10.7 meters which is not seen in the video.



The FC height is the result of a fusion algorithm that depends on the accelerometer, barometric, GPS receiver and ultrasonic height data. These data can be found in the .DAT log file if it can be retrieved. Look in the FlightRecords/MCDatFlightRecords for a file with the name  FLYxxx-050-20220xxxxxxx.DAT.

The video claims the "even though the pilot is holding the up stick the whole time". The log actually shows only partial throttle application.

After about  12 secs the difference between the ultrasonic and FC heights seems to have resolved.

It's possible that this incident could have been avoided if the throttle were held full positive in the first 12 secs.  The FPV would have remained air born until the ultrasonic and FC height difference was resolved.

VideoLife_FPV Posted at 8-7 23:43
No problem!
Thank you sir, I have sent an inquiry.
Have a nice day!

Hi there VideoLife_FPV. Thank you for the reply and if you have any other concerns or any inquiries with DJI in the future. Please feel free to post it here at DJI Forum. We are all here to help and assist you. Thank you. .

BudWalker Posted at 8-10 06:47
In summary the FPV's Flight Controller thought the FPV was ascending when in fact it wasn't. This caused the FC compensate by commanding the FPV to descend.

There is good agreement between the ultrasonic height (green) and the video at 1) the first bump with the car roof, 2) the increase in ultrasonic height when the FPV moves from being over the car roof, and 3) the second bump with the asphalt. Also seen is the steady increase of the FC height (red) to about 10.7 meters which is not seen in the video.

Thank you sir for this expertise, it was very interesting to analyze this.
I just have to mention that I held the throttle the whole time, until the moment it bounced off the asphalt, and then I wanted to lower it, but even then the drone did not respond to my commands.
I know that the flight data shows that there was no throttle, but I know that, almost in a panic, I held the throttle.
However, even if I didn't hold the throttle, the drone needed to hover, but it didn't, it even fell.
All of this happened beyond my control.

VideoLife_FPV Posted at 8-10 23:12
Thank you sir for this expertise, it was very interesting to analyze this.
I just have to mention that I held the throttle the whole time, until the moment it bounced off the asphalt, and then I wanted to lower it, but even then the drone did not respond to my commands.
I know that the flight data shows that there was no throttle, but I know that, almost in a panic, I held the throttle.

All I can do is look at the data which shows less than full elevator input.

I have had three crashes were it felt like someone else was flying. I think it is RF interference. I am in the middle of nowhere though so I don't know where it is coming from. I turn my phone off but I have no idea if that helps. I haven't wrecked since though.

BudWalker Posted at 8-11 10:05
All I can do is look at the data which shows less than full elevator input.

I understand, but then it's obviously some kind of communication error between the RC and the drone.
At the beginning, you can hear the oscillations of the engine sound, although at those moments it is unquestionable that I was holding the throttle.
Also, it is unquestionable that I held the Throttle the entire time, but the drone was out of my control.
Such situations can be dangerous for other people's lives.
I am thinking of activating the warranty on the device, because I have no confidence in this drone.

NewGuyFPV Posted at 8-11 12:41
I have had three crashes were it felt like someone else was flying. I think it is RF interference. I am in the middle of nowhere though so I don't know where it is coming from. I turn my phone off but I have no idea if that helps. I haven't wrecked since though.

These are very dangerous situations, and I think someone should look into the problem more.