First crash of my Mavic Mini

[new2mavic]

.... the FC concluded you were too close to the ground and landed....

Under such condition, the FC will command the craft to land only if the throttle stick is held fully down. The OP have done the opposite-full throttle up so the crash was due to some other reasons.

 

[new2mavic]

Flight log DJI Flight Log Viewer - PhantomHelp.com

As I have expected earlier. This case is similar to this one : DJI Mavic Mini Erratic Aircraft Behavior and Crash

The craft was still behaving normally at this point. Full forward elevator, tilting angle about 15 degree ( see the attitude chart on the right ) , speed about 13 mph



However, shortly afterwards, something has gone wrong. Despite full forward elevator, the craft didn't tilt at all and there was almost no forward speed. This is a sign of insufficient power from the motors at the back. To force the craft to tilt ( nose down ), the only thing the flight controller could do is to reduce the power of the motors at the front. This would end up in the power of all motors reduced so the craft was unable to maintain altitude and dropped to the ground.



If you can supply the .DAT files, it will be easier to indentify the actual reason. Follow this thread to get the .DAT file : Flight log retrieval and analysis guide

 

[new2mavic]

.... the flight from last weekend too pls DJI Flight Log Viewer - PhantomHelp.com

This is just nothing more than a normal landing. The throttle stick was held fully down all the way to the end :

 

[Fly Dawg]

Under such condition, the FC will command the craft to land only if the throttle stick is held fully down.

Normally, yes. However, if and (IF), this is related to the other uncommanded descents, it further points to a firmware bug, IMO.

 

[Thompson973]

This is just nothing more than a normal landing. The throttle stick was held fully down all the way to the end :

View attachment 91221

It was mid flight were the aorcraft dropped

 

[Thompson973]

As I have expected earlier. This case is similar to this one : DJI Mavic Mini Erratic Aircraft Behavior and Crash

The craft was still behaving normally at this point. Full forward elevator, tilting angle about 15 degree ( see the attitude chart on the right ) , speed about 13 mph

View attachment 91219

However, shortly afterwards, something has gone wrong. Despite full forward elevator, the craft didn't tilt at all and there was almost no forward speed. This is a sign of insufficient power from the motors at the back. To force the craft to tilt ( nose down ), the only thing the flight controller could do is to reduce the power of the motors at the front. This would end up in the power of all motors reduced so the craft was unable to maintain altitude and dropped to the ground.

View attachment 91220

If you can supply the .DAT files, it will be easier to indentify the actual reason. Follow this thread to get the .DAT file : Flight log retrieval and analysis guide

They dont seem to be there only one is shown?

 

[new2mavic]

It was mid flight were the aorcraft dropped

You meant it dropped in altitude during the flight but was able to continue flying afterwards? If this was so I have missed it

 

[Thompson973]

You meant it dropped in altitude during the flight but was able to continue flying afterwards? If this was so I have missed it

Yes thats what happened

 

[new2mavic]

....flight from last weekend too pls DJI Flight Log Viewer - PhantomHelp.com

OK, I have taken a second look at the flight data and saw the rapid drop in altitude you have mentioned. I think it was caused by a sudden change in wind direction during which the air flow was typically very turbulent. There could be a momentary down flow of air pushing the drone towards the ground.

 

[Thompson973]

OK, I have taken a second look at the flight data and saw the rapid drop in altitude you have mentioned. I think it was caused by a sudden change in wind direction during which the air flow was typically very turbulent. There could be a momentary down flow of air pushing the drone towards the ground.

View attachment 91271

Thanks for looking again i thought it may have been wind but thanks for checking. Can you help retrieve .dat files?

 

[new2mavic]

Thanks for looking again i thought it may have been wind but thanks for checking. Can you help retrieve .dat files?

You may follow this thread to get the .DAT files : Flight log retrieval and analysis guide

 

[Thompson973]

@new2mavic finally got the .DAT files which one is needed?

 

[Fly Dawg]

finally got the .DAT files which one is needed?

See Post#18...There are two .dat's.

 

[Thompson973]

.DAT file linkshttps://www.dropbox.com/s/zz9ln6z2u321xt4/FLY050.DAT?dl=0

FLY043.DAT

Shared with Dropbox

www.dropbox.com

 

[Thompson973]

FLY050.DAT

Shared with Dropbox

www.dropbox.com

 

[Thompson973]

@new2mavic @Fly Dawg .dats links above

 

[Fly Dawg]

@Thompson973 Both of these files are un-readable. Thes aren't by chance from the aircraft itself are they?

 

[Thompson973]

@flydawg Thats correct yes

 

[Fly Dawg]

Thats correct yes

That is why. The aircraft files are encrypted on the mini. We need the device .dat. That one is readable.

 

[sirbadger]

@flydawg Thats correct yes

You want the one from your phone/tablet in the MCDatFlightRecords folder.