Another Flyaway

Oliver_I · Mar 30, 2018

Hi there,

I had my first Mavic Air flyaway this morning. Right after the start at about 20m height the Mavic drifted away sideways fast and hit a tree shortly after that.
I can't really make any sense of the flight logs... would anyone like to have a look and maybe point me in the right direction what went wrong?

DJI Flight Log Viewer - PhantomHelp.com

Thanks and best regards
Oliver

JoostGT3 · Mar 30, 2018

Ouch, that’s sad to hear mate! It sounds like it hadn’t found a good gps lock yet and hadn’t updated the homepoint. Maybe some of the more informed members can help you out.

Oliver_I · Mar 30, 2018

Thanks, mate. The good news is: The Mavic seems to be fine, although it hit the tree hard! Cleaned it, installed new props and did a test flight - everything OK so far.

MavicCF · Mar 30, 2018

Oliver_I said:
Hi there,

I had my first Mavic Air flyaway this morning. Right after the start at about 20m height the Mavic drifted away sideways fast and hit a tree shortly after that.
I can't really make any sense of the flight logs... would anyone like to have a look and maybe point me in the right direction what went wrong?

DJI Flight Log Viewer - PhantomHelp.com

Thanks and best regards
Oliver

Do you have video of the flight by any chance?

Oliver_I · Mar 30, 2018

MavicCF said:
Do you have video of the flight by any chance?

Unfortunately not :-(

MavicCF · Mar 30, 2018

Oliver_I said:
Unfortunately not :-(

Do you think you could upload the DAT file from the Mavic? Here's a link on how.

sar104 · Mar 30, 2018

Which direction was it pointing at takeoff?

Oliver_I · Mar 30, 2018

sar104 said:
Which direction was it pointing at takeoff?

I think with the camera turned away from me, but I'm not sure anymore.

Oliver_I · Mar 30, 2018

MavicCF said:
Do you think you could upload the DAT file from the Mavic? Here's a link on how.

Yes, I think I got the correct one. Put it on my dropbox: Dropbox - DJI_ASSISTANT_EXPORT_FILE_2018-03-30_17-18-05.DAT

sar104 · Mar 30, 2018

Oliver_I said:
I think with the camera turned away from me, but I'm not sure anymore.

That doesn't help - I don't know which direction you were facing. I mean in which direction - N, S, E, W etc..

And is the track shown on the PhantomHelp website correct in terms of what it really did?

MavicCF · Mar 30, 2018

I just love downloading DATs at our house! Estimated time it will take is an hour and a half

.

sar104 · Mar 30, 2018

MavicCF said:
I just love downloading DATs at our house! Estimated time it will take is an hour and a half.

What kind of connection do you have? It took just under 60 s for me.

Oliver_I · Mar 30, 2018

sar104 said:
That doesn't help - I don't know which direction you were facing. I mean in which direction - N, S, E, W etc..

And is the track shown on the PhantomHelp website correct in terms of what it really did?

Ah sorry, according to the DJI App it should have been facing East/South-East when starting. Sounds right. And the track on PhantomHelp looks slightly off, but only by a couple of meters. I think I started in the area without trees right above the starting point shown on that map.

sar104 · Mar 30, 2018

Oliver_I said:
Ah sorry, according to the DJI App it should have been facing East/South-East when starting. Sounds right. And the track on PhantomHelp looks slightly off, but only by a couple of meters. I think I started in the area without trees right above the starting point shown on that map.

Sorry to persist but this is important. I know that the log says it was facing ESE (110° to be precise) but, if that is correct, then your original description of it drifting away "sideways" is not correct - it would have been heading approximately forwards. Hence my question.

MavicCF · Mar 30, 2018

sar104 said:
What kind of connection do you have? It took just under 60 s for me.

We don't have lines laid in our area (very remote) so our internet is through the hotspots on our phones.

netfolks2000 · Mar 30, 2018

Wow. At several points it had alerts that there was a GPS connection problem but on the left it never showed GPS was not connected. You also had a warning that an engine was in distress, being obstructed, but only once, and not at the end when you encountered the tree, unless you may have bumped into it more than once. At 72 feet I would not think you could encounter a tree but I don't know, you might have trees that tall. Did you see where you were on the map before you took off? Is this a regular place you fly from or did you travel to get to this launch place?

Oliver_I · Mar 30, 2018

sar104 said:
Sorry to persist but this is important. I know that the log says it was facing ESE (110° to be precise) but, if that is correct, then your original description of it drifting away "sideways" is not correct - it would have been heading approximately forwards. Hence my question.

Hi! Yes, sorry, I wasn't precise. It wasn't drifting sideways, you are right. It just went off to the right because I was just ascending and looked north. So drifting sideways wasn't correct. It took off in I'd say eastern direction.

sar104 · Mar 30, 2018

MavicCF said:
We don't have lines laid in our area (very remote) so our internet is through the hotspots on our phones.

You might not want to waste your data - DatCon and CsvView report that it is not a valid DAT file.

sar104 · Mar 30, 2018

Oliver_I said:
Hi! Yes, sorry, I wasn't precise. It wasn't drifting sideways, you are right. It just went off to the right because I was just ascending and looked north. So drifting sideways wasn't correct. It took off in I'd say eastern direction.

OK thanks. There appears to be a problem with the DAT file - I can't open it. Still looking into that.