My SE crashed in open air. at alt 30meter dis. 246m, lost signal.
https://photos.app.goo.gl/tk6zE64TnaXsp2Xh6
https://photos.app.goo.gl/dFTfHyss6hM5QHqd7

https://photos.app.goo.gl/th5Cv1KgDWFXsTNRA

https://photos.app.goo.gl/oRxKsKBEQnUcBYSX7

https://photos.app.goo.gl/yXvsK7wfYQJxedVT9

Yep, that can happen.  Any thoughts on why you lost signal?

TonyPHX Posted at 3-6 08:19
Yep, that can happen.  Any thoughts on why you lost signal?

Batteries were full, and the remote antennas were in the right position. I was flying above a campsite with a lot of wifi points. Maybe that caused some interference.

Well that sucks man.  Here's to getting back in the air!

TonyPHX Posted at 3-6 08:26
Well that sucks man.  Here's to getting back in the air!

I've bought a new one + DJI Care Refresh . The old one has to much damage.

Hi,

But why did it crashed?
Loosing connection means a RTH, so what happend ?

If you like upload your log using > http://www.phantomhelp.com/LogViewer/Upload/

cheers
JJB

JJB* Posted at 3-6 11:51
Hi,

But why did it crashed?

https://www.phantomhelp.com/LogViewer/128J2CPG0UAK0296MRXY

FreekKnol Posted at 3-6 12:44
https://www.phantomhelp.com/LogViewer/128J2CPG0UAK0296MRXY

No high obstacles

FreekKnol Posted at 3-6 12:46
No high obstacles

Hi Freek,

In the log no disconnect.

Flying at approx 30 meter height, reaching the holiday camp shore line it suddenly fell like a brick....
High amps, low cell voltage ; guess max rpm on the motors.

Indeed no obstacles there, so a) simple motor fail, or b) hit something.

cheers
JJB

FreekKnol Posted at 3-6 08:23
Batteries were full, and the remote antennas were in the right position. I was flying above a campsite with a lot of wifi points. Maybe that caused some interference.

First thing ... your drone crashed and then the signal was lost.
Losing signal did not happen until the drone crashed on the ground.

I was flying above a campsite with a lot of wifi points. Maybe that caused some interference.
Interference won't ever cause your drone to fall from the sky.

Your data shows an unusual crash.
It shows a problem starting at 3:26.9 with the drone 97 feet up and it started to lose altitude without any corresponding joystick input.
The unusual thing is that as the drone fell to earth, its pitch, roll and yaw data don't show the normal tumbling, rolling or fast spinning that indicates a loss of one propeller or motor.
They also don't show anything to indicate a collision with anything.

The drone quickly reached terminal velocity and crashed at 3:29.
Any messages after that are a result of the crash and not related to the cause.

The actual cause is a mystery, but it's clearly a failure of the drone.
If your drone was still in warranty, this is a case for DJI to look into.

JJB* Posted at 3-6 13:21
Hi Freek,

In the log no disconnect.

so a) simple motor fail, or b) hit something
Look again .. the data doesn't support either of those options.

Labroides Posted at 3-6 13:53
First thing ... your drone crashed and then the signal was lost.
Losing signal did not happen until the drone crashed on the ground.

It was 3 weeks old Another stange thing;
I found it 60 meters north from the place it should be. Wind was coming from the east.

FreekKnol Posted at 3-6 14:01
It was 3 weeks old  Another stange thing;
I found it 60 meters north from the place it should be. Wind was coming from the east.

The data indicates the crash was where indicated by the yellow arrow.
There is a lot of false data after the impact that suggests a false position about 30 metres to the west of there.

Labroides Posted at 3-6 13:55
so a) simple motor fail, or b) hit something
Look again .. the data doesn't support either of those options.

Hi Labroides,

No need to look again ofcourse, thanks for the 'advice', but as you asked it friendly i did load the log again.
But your "failure of the drone" equals my "simple motor fail", both explaining an out of the normal failure for a DJI drone, so why the need for you to give me advice?

btw, in a general speaking ; directive writing doesn`t mean that the writing is correct, for newbies and non tech readers bit overwhelming mayby , as you would understand as a scientist.

Agree, we both do not know what happend, but if 2 motors were 'hit' slightly and both had difficulty to spin freely afterwards....
High amps could say something about the power draw, engines at high rpm uses a lot, or high amp to try to keep the motors at needed rpm if motor doesn`t spin freely.
Indeed no spinning or tumbling down but craft moved in a right turn down, see roll (more/less 'steady linear'  50 to 30 degrees right) and pitch drone angles and move data line. Move line does say something about the power distribution/rpm`s of the motors.
If al 4 engines equally down in speed bc of a FC fail, craft would move down in a forward movement.

cheers
JJB

JJB* Posted at 3-7 00:55
Hi Labroides,

No need to look again ofcourse, thanks for the 'advice', but as you asked it friendly i did load the log again.

so why the need for you to give me advice?
Because if there was a loss of one motor or prop, the drone would have dropped on the corner of the affected prop and it would have shown a fast spinning with some tumbling.

If it had hit something or been hit, that would have left unmistakable evidence in the pitch, roll and yaw data.
But there is none.

This drone fell to earth as fast as it would have from a total power loss.
The drone managed to maintain a more or less level attitude, but fell fast.
It looks like there was a substantial loss of thrust from all motors, but not so much that the drone tumbled.
I've not seen data from that sort of incident before.

Labroides Posted at 3-7 02:39
so why the need for you to give me advice?
Because if there was a loss of one motor or prop, the drone would have dropped on the corner of the affected prop and it would have shown a fast spinning with some tumbling.

Hi Labroides,

True, loss of one motor or prop = spinning down, this not the case. I did not say this.

Drone did not fell to earth as it would have from total power loss, if this was the case than in would falling down with fwd speed (fwd speed from the momentum it had....)

Absolute no craft level attitude, see roll data in my charts. With this roll right attitude it fell down in a right turn, then straight than right again.
Bc of the roll right attitude not all 4 motors were without power, loss of rpm at front right and probably rear right too.Did it hit someting, mayby mayby   some feathers in the right props   ;-)   5% possibility, so must have been a power error   but is it likely to have that only on the right side ?
Agree with you, difficult to have a correct explanation for this mishap.

It`s a shame that Mini2 DAT cannot be read, would have crucial info about the motors in there.

cheers
JJB

FreekKnol Posted at 3-6 14:01
It was 3 weeks old  Another stange thing;
I found it 60 meters north from the place it should be. Wind was coming from the east.

Hi Freek,

As you did find your drone, in wich shape is it?
Anything to see on the motors / blades ?

cheers
JJB

Hi, thank you for reaching out. We're sorry for the unpleasant experience. In this kind of situation, I'm afraid that you may consider sending the unit in for a proper diagnosis. You can contact our support team to start up a ticket at https://www.dji.com/support. Also, the warranty can be applied depending on the outcome of the damage assessment including the warranty period of your unit. To check the warranty period for each part, you may click this link: https://www.dji.com/service/policy. Thank you for your kind and understanding.

JJB* Posted at 3-7 02:59
Hi Labroides,

True, loss of one motor or prop = spinning down, this not the case. I did not say this.

Drone did not fell to earth as it would have from total power loss.
That's not what I said.
I said it fell as fast as it would from a total power loss.
But in a total power loss the drone would have tumbled .

Absolute no craft level attitude, see roll data in my charts.
Look at the pitch and roll data before and after the incident started at around 3:26.9.
Within 3 seconds it had crashed.

There was no large change in pitch, roll and yaw during the descent and the drone maintained the attitude it had before the problem.

JJB* Posted at 3-7 03:03
Hi Freek,

As you did find your drone, in wich shape is it?

I found it in pretty bad shape. It must have hit one of the caravans., before it fell on the beach. The beach is soft dry sand.
Camera is broken, the housing cracked, and 3 blades are broken. And I can't fold the rear arms.

Labroides Posted at 3-7 03:52
Drone did not fell to earth as it would have from total power loss.
That's not what I said.
I said it fell as fast as it would from a total power loss.

Look at the pitch and roll data before and after the incident started at around 3:26.9.
Within 3 seconds it had crashed.

There was no large change in pitch, roll and yaw during the descent and the drone maintained the attitude it had before the problem.

Do you look at the correct records?

chart1 > before the mishap > roll angles 0 to 3 degrees right.
chart2 > falling down in right turn > roll angles 30 - 50 degrees.

So why do you say that it maintained the attitude wich it had before?

cheers
JJB

JJB* Posted at 3-7 04:24
Look at the pitch and roll data before and after the incident started at around 3:26.9.
Within 3 seconds it had crashed.

Do you look at the correct records?
I would ask you the same question.
The drone crashed at 3:29.
The problem in the air started somewhere around 3:26

You are looking at data from after the impact rather than when the drone was falling.
What it did after hitting the ground is irrelevant.

FreekKnol Posted at 3-7 04:21
I found it in pretty bad shape. It must have hit one of the caravans., before it fell on the beach. The beach is soft dry sand.
Camera is broken, the housing cracked, and 3 blades are broken. And I can't fold the rear arms.

oke, too bad   so it wasn`t a soft landing at all....

Did you bought a MINI2 as a replacement?

cheers
JJB

JJB* Posted at 3-7 04:36
oke, too bad   so it wasn`t a soft landing at all....

Did you bought a MINI2 as a replacement?

I've bought a mini SE again. I have some spare parts now
This time with the DJI Care Refresh .

Labroides Posted at 3-7 04:29
Do you look at the correct records?
I would ask you the same question.
The drone crashed at 3:29.

Interesting observation, thanks

But crashing into a hard object while in connection with the RC ; this would be seen in the log, pitch  and roll angles do not really indicate a crash at m29.

If you are correct;
- why did it record after 3m29 for 6 seconds different LatLon positions?
- it if has crashed at m29, than why are the pitch and roll angles changing for 6 seconds?- speed is indicating as well

I see a similary in other files ; out of the normal baro height values and rate of descend values.
(minus 170 meter baro height is way to deep for an impact crater  ;-)  )

With this rate of descend it should crashed before m29   with minus 30 m/s and more...

Strange flightlog data....

cheers
JJB

FreekKnol Posted at 3-7 04:47

wow, what a hard crash !
not many usable spare parts though....  

Many happy landings with the new SE

cheers
JJB

JJB* Posted at 3-7 04:59
Interesting observation, thanks

But crashing into a hard object while in connection with the RC ; this would be seen in the log, pitch  and roll angles do not really indicate a crash at m29.

I was just going by the height data as I didn't see any reason to distrust it.
But your point that the crash should have registered in pitch/roll etc is valid.

You can see where the GPS data indicates the drone went after the crash in the Gppgle Earth image I posted earlier.

I'm not sure what to make of some of the odd things in the data.

JJB* Posted at 3-7 04:59
Interesting observation, thanks

But crashing into a hard object while in connection with the RC ; this would be seen in the log, pitch  and roll angles do not really indicate a crash at m29.

minus 170 meter baro height is way to deep for an impact crater
The IMU is sensitive to crash impacts and those sort of false values are common after a hard impact.

Labroides Posted at 3-7 05:09
I was just going by the height data as I didn't see any reason to distrust it.
But your point that the crash should have registered in pitch/roll etc is valid.

yep, flight path shows that it landed in the water, later on in this thread i read that the SE found in the sand. So LatLon data incorrect, but 'connecting' the flightpath and the roll right angles made me think is did really flown that path.

What i emperic knows is that mode goes into ATTI if rate of decend gets really high. In this ATTI the LatLon positions are normally recorded but not used anymore. (GPS health 5 to 0 does indicate this)

Indeed confusing data in this log.

cheers
JJB

Labroides Posted at 3-7 05:17
minus 170 meter baro height is way to deep for an impact crater
The IMU is sensitive to crash impacts and those sort of false values are common after a hard impact.

I know  but why in 6 , 7 seconds in steps to minus 170?

Drone hard crash is very short moment so i would understand reading e.g. 20 feet to -300 feet in 0.1 sec. Not like this.

With a power failure to the system i have seen more unrealistic baro height and rate of descend values, progressively into higher numbers.

According to the data; Could it be, that a prop.blade broke in the sky?

FreekKnol Posted at 3-7 06:34
According to the data; Could it be, that a prop.blade broke in the sky?

Hi Freek,

Do not think one prop broke in flight, if this happen than the drone will spin downwards and all other indications would be 'normal' values.

cheers
JJB

Sorry about your loss. I just bought this yesterday and I'm still making sure I have the entire DJI fly app figured out, with the exception of some of the advanced settings which are pretty much in another language to me... Have you had many flights with this before the crash? How well does the rth work? I hope your new one is doing much better than the old one.

fans8075151c Posted at 3-12 11:07
Sorry about your loss. I just bought this yesterday and I'm still making sure I have the entire DJI fly app figured out, with the exception of some of the advanced settings which are pretty much in another language to me... Have you had many flights with this before the crash? How well does the rth work? I hope your new one is doing much better than the old one.

Hello, The crashed one had about 60 flights. RTH works fine, altough it lands not exactly on the launch spot. Know how the panic button works. It can safe a lot of touble. Start in C-mode when learning.

Looking at the posted logs I would bet a hawk intercepted it midair and stopped two props with its talons, flew for a short distance  then just dropped it. ;-)

PHodara Posted at 7-14 07:48
Looking at the posted logs I would bet a hawk intercepted it midair and stopped two props with its talons, flew for a short distance  then just dropped it. ;-)

Your guess is not supported by the recorded flight data.

My mini SE also dropped out of the sky at 13 meters on a 18 second flight, only its 3rd time out. Also not yet a month old. When I first ever started the drone it had an issue with one of the props not rotating but it worked after turning it upside down a couple of times (apparently dust can get in during the manufacturing process}. That's what google stated anyway :-)

It had had a five minute flight minutes before  (Batteries were full) with no issues and then this, take off, crash!!! Actually, Plummet and then crash. Reading through the forums doesn't give me a conclusion on what it was, propellers and body all in tact.

Looking at the log file there is a drop in Voltage to 7.5v just before but I really don't have a clue if this is an issue or not, it just doesn't go to 7.5v on the previous flight. Any thoughts?