My Mavic just flew into a wall!

yymavyy · Aug 10, 2017

Hey guys,

I was flying outside today- really close to the drone. I positioned the drone and prepared to take a shot. As I looked up, the mavic was flying towards a wall!

It was at least 15-20m from the wall but in a fit of panic, I didn't want to hit any of the sticks incase I hit the wrong one.

I figured the sensors would prevent a collision.
It happened SO fast. Boom!

Crashed into the wall!
Here is my data log. Much if it is self explanatory, but can anyone see anything that will tell me why the drone got a brain of its own?

Not sure if this is for insurance or DJI direct.

DJI Flight Log Viewer - PhantomHelp.com

Many thanks in advance

sonof40 · Aug 10, 2017

I would find a place with a better satellite count.

Flying Images · Aug 10, 2017

I've flown in valleys with very little gps signal and it was fine. Very close to rock walls. Stable as can be.

Robbyg · Aug 10, 2017

At several points the GPS signal had issues and you got a "GPS NO MATCH" error. I think the last time we saw one of these was when the Mavic was surrounded by buildings and it did the same thing as yours.

It seems to happen due to reflected GPS signals being picked up by the mavic. It confuses the system because at one point in time it gets a reading that it is at position X and in a few milliseconds it gets a reading that it totally different without stick input. I think the craft tries to head back to what it thinks is the correct position.

Rob

james_mav · Aug 10, 2017

yymavyy said:
Hey guys,

I was flying outside today- really close to the drone. I positioned the drone and prepared to take a shot. As I looked up, the mavic was flying towards a wall!

It was at least 15-20m from the wall but in a fit of panic, I didn't want to hit any of the sticks incase I hit the wrong one.

I figured the sensors would prevent a collision.
It happened SO fast. Boom!

Crashed into the wall!
Here is my data log. Much if it is self explanatory, but can anyone see anything that will tell me why the drone got a brain of its own?

Not sure if this is for insurance or DJI direct.

DJI Flight Log Viewer - PhantomHelp.com

Many thanks in advance

Tell us a little bit more about where you were flying. Was the wall really the side of a large metal building. Something was causing a lot of interference with your signal.

go fast · Aug 10, 2017

What type of damage ?

FlyGuy8675309 · Aug 10, 2017

Oh man that sucks. Hopefully the repair isn't too much.

helmut · Aug 11, 2017

GPS has nothing to do with collision avoidance. Only the two sensors in front are working.
1. did you fly backward?
2. was the wall made of reflective material or glass (windows)?
3. did you fly in Sports mode?

Any one of the 3 can cause the crash

manuelk · Aug 11, 2017

Robbyg said:
At several points the GPS signal had issues and you got a "GPS NO MATCH" error. I think the last time we saw one of these was when the Mavic was surrounded by buildings and it did the same thing as yours.

It seems to happen due to reflected GPS signals being picked up by the mavic. It confuses the system because at one point in time it gets a reading that it is at position X and in a few milliseconds it gets a reading that it totally different without stick input. I think the craft tries to head back to what it thinks is the correct position.

Rob

Do you talk about my case? Crashed my Mavic, but why? Can someone help?

Robbyg · Aug 11, 2017

manuelk said:
Do you talk about my case? Crashed my Mavic, but why? Can someone help?

No, not that one because I know I posted in the threads that I am referring to. In yours only Budwalker responded. I remember in one of them the guy was flying low between three high rise buildings.

YYMAVY should upload the DAT file from his crash. It will at least give us more info.

How to retrieve a .DAT

Rob

BigDuke6ixx · Aug 11, 2017

manuelk said:
Do you talk about my case? Crashed my Mavic, but why? Can someone help?

Read post #8

yymavyy · Aug 11, 2017

Flying Images said:
I've flown in valleys with very little gps signal and it was fine. Very close to rock walls. Stable as can be.

Same here. Its so confusing!

yymavyy · Aug 11, 2017

Robbyg said:
At several points the GPS signal had issues and you got a "GPS NO MATCH" error. I think the last time we saw one of these was when the Mavic was surrounded by buildings and it did the same thing as yours.

It seems to happen due to reflected GPS signals being picked up by the mavic. It confuses the system because at one point in time it gets a reading that it is at position X and in a few milliseconds it gets a reading that it totally different without stick input. I think the craft tries to head back to what it thinks is the correct position.

Rob

This sounds logical. Thanks mate. Do you think I'll be covered under warranty?

yymavyy · Aug 11, 2017

james_mav said:
Tell us a little bit more about where you were flying. Was the wall really the side of a large metal building. Something was causing a lot of interference with your signal.

So I was in an area where there is a lot of building work going on. The wall looked concrete, to be honest, I'm not sure how much metal was around. I have flown there before with no issues at all.

yymavyy · Aug 11, 2017

Robbyg said:
No, not that one because I know I posted in the threads that I am referring to. In yours only Budwalker responded. I remember in one of them the guy was flying low between three high rise buildings.

YYMAVY should upload the DAT file from his crash. It will at least give us more info.

How to retrieve a .DAT

Rob

.DAT file
FLY045.DAT

colinfowler · Aug 11, 2017

yymavyy said:
So I was in an area where there is a lot of building work going on. The wall looked concrete, to be honest, I'm not sure how much metal was around. I have flown there before with no issues at all.

concrete walls have a lot of metal in them

Robbyg · Aug 11, 2017

yymavyy said:
This sounds logical. Thanks mate. Do you think I'll be covered under warranty?

Unfortunately I do not think so. DJI will say you chose the area to fly in etc etc.

I will take a look at the DAT file as soon as I get a chance.

Rob

yymavyy · Aug 12, 2017

Robbyg said:
Unfortunately I do not think so. DJI will say you chose the area to fly in etc etc.

I will take a look at the DAT file as soon as I get a chance.

Rob

Thanks mate.

joejoseph · Aug 12, 2017

yymavyy said:
Hey guys,

I was flying outside today- really close to the drone. I positioned the drone and prepared to take a shot. As I looked up, the mavic was flying towards a wall!

It was at least 15-20m from the wall but in a fit of panic, I didn't want to hit any of the sticks incase I hit the wrong one.

I figured the sensors would prevent a collision.
It happened SO fast. Boom!

Crashed into the wall!
Here is my data log. Much if it is self explanatory, but can anyone see anything that will tell me why the drone got a brain of its own?

Not sure if this is for insurance or DJI direct.

DJI Flight Log Viewer - PhantomHelp.com

Many thanks in advance

DJI will say it's your fault !!! cause if you see logs youll remark that drone passed to ATTI mode(cause you are in a zone that have a bad Satellite coverage I think) and in DJI Notice , they say in ATTI Mode all sensors are off, fly with caution, then you got the warning dude !!
And also you should know that when Joystick vibrate, than the flying mode had changed, you should directly look to which flying mode your in.
in Atti mode the drone will not be hovering in a fixed place, he will be same as the chinese drones, very hard to fly, if piloted by a beginner. you should be very careful
Sorry man but unfortunately its 100% on you.
also I remarked a problem with IMU altitude, when in atti mode cant say if it's normal.

Dextra · Aug 12, 2017

How many satellites were you flying with? Come on you should have known from reading the manual that's a bad sign.

Then we have multi ATTI modes as listed in your flight data - again major issue. You should have raised the bird and brought her back to home as safely as possible - not easy in ATTI but again your fault.

This is 101% operator error. Nothing to do with DJI. I've gone through your entire flight data, and you was suffering major signal interference in a mass built up area. That to me as an experienced drone builder and flyer tells me you've not read the manuals. Your fault, not DJI's, read the manuals and quit moaning over your own mistake!

MANUALS https://dl.djicdn.com/downloads/mav...lligent+Flight+Battery+Safety+Guides+(EN).pdf
https://dl.djicdn.com/downloads/mavic/Mavic+Pro+User+Manual+V1.0.pdf

PS. I highly doubt you'll get much luck from DJI. Did you take out insurance?

Your own fault matey, I've no sympathy.