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Lost Phantom 3 Pro recovery
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pascalmarch
lvl.1
Flight distance : 388123 ft
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Unexpected wind gusts prevented auto return home to bring the drone back to the home point, instead it drifted away and landed in a field. The log shows that the red arrow (drone position) stopped at the 8:05 minute mark and at 26 meters altitude but the trajectory line carries on for about 100 meters. Which of the two, the red arrow or the end of the trajectory line would be a better bet to investigate?

Screenshot_2018-08-07-14-50-58-1.jpg
2018-8-7
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pascalmarch
lvl.1
Flight distance : 388123 ft
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Correction, the drone stopped transmitting and recording information at 26 meter altitude at the 8:35 flight duration mark.
2018-8-7
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Mark The Droner
Captain
Flight distance : 2917 ft
United States
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I think I would upload the log to http://www.phantomhelp.com/LogViewer/Upload/ and then study the data and map
2018-8-7
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ALABAMA
Captain
Flight distance : 10442687 ft
United States
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Looks like it couldn't have gone much further before auto landing.
2018-8-7
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DJI Stephen
DJI team
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Hi there, I'm sorry for the Inconvenience that you have faced. Regarding that, I would suggest contacting our support for them to assist you and see what they can do about it, just go to this Link https://www.dji.com/support then you can choose between Online Support, Email, and Phone Support.
2018-8-7
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pascalmarch
lvl.1
Flight distance : 388123 ft
Canada
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ALABAMA Posted at 2018-8-7 12:30
Looks like it couldn't have gone much further before auto landing.

Do you mean "after" auto landing?
2018-8-7
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pascalmarch
lvl.1
Flight distance : 388123 ft
Canada
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Mark The Droner Posted at 2018-8-7 11:42
I think I would upload the log to http://www.phantomhelp.com/LogViewer/Upload/ and then study the data and map

Nice, doing it right now.
2018-8-7
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pascalmarch
lvl.1
Flight distance : 388123 ft
Canada
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pascalmarch Posted at 2018-8-7 13:24
Nice, doing it right now.

The log input worked great, thanks for the link. I now see more information like critical phases or steps represented by colored dots. I also notice that the trajectory line changes color at different stages of the flight but I'm not sure which color means what. Here is the log: https://bit.ly/2ALSl3Y
2018-8-7
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pascalmarch
lvl.1
Flight distance : 388123 ft
Canada
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Mark The Droner Posted at 2018-8-7 11:42
I think I would upload the log to http://www.phantomhelp.com/LogViewer/Upload/ and then study the data and map

The log input worked great, thanks for the link. I now see more information like critical phases or steps represented by colored dots. I also notice that the trajectory line changes color at different stages of the flight but I'm not sure which color means what. Here is the log: https://bit.ly/2ALSl3Y
2018-8-7
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ALABAMA
Captain
Flight distance : 10442687 ft
United States
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I don't think we're seeing what you are lol.
2018-8-7
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Labroides
Captain
Flight distance : 9991457 ft
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Australia
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pascalmarch Posted at 2018-8-7 13:50
The log input worked great, thanks for the link. I now see more information like critical phases or steps represented by colored dots. I also notice that the trajectory line changes color at different stages of the flight but I'm not sure which color means what. Here is the log: https://bit.ly/2ALSl3Y

Here's your flight record:  http://www.phantomhelp.com/LogViewer/7YG34SOP2A9T2H8GO7X7/

You launched with a partially discharged battery (potential fatal error) showing 57% and 3.8 V per cell.
Within 1.5 minutes, under load (climbing) the battery was already down to 3.4V (very low) per cell.

Your last recorded position was Lat 45.4275831  Long -73.933106
The Phantom was still 22 metres above the ground and may have landed a little further to the east.
2018-8-7
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Mark The Droner
Captain
Flight distance : 2917 ft
United States
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Another one for my list
2018-8-7
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pascalmarch
lvl.1
Flight distance : 388123 ft
Canada
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Labroides Posted at 2018-8-7 16:09
Here's your flight record:  http://www.phantomhelp.com/LogViewer/7YG34SOP2A9T2H8GO7X7/

You launched with a partially discharged battery (potential fatal error) showing 57% and 3.8 V per cell.

Thanks to you and other comments, I have found it! It was down in the field where the end of the trajectory line stops, pretty precise too.
2018-8-7
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Anthony90
lvl.4
Flight distance : 761519 ft
Australia
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As a new drone operator I am sadly loving this forum on what not to do. I now have a world of knowledge from reading every morning.
2018-8-7
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endotherm
Captain
Flight distance : 503241 ft

Australia
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pascalmarch Posted at 2018-8-7 16:32
Thanks to you and other comments, I have found it! It was down in the field where the end of the trajectory line stops, pretty precise too.

The very straight white "trajectory line" is actually not a true representation of the flight path.  It seems like at 8:35 you lost telemetry, and at the end of the line you briefly restored telemetry again.  The missing data is just ignored in the track screen and is joined by a straight line.  Your actual path would have been more "organic" and curved.  The fact that it drew a line at all shows that the app received updated location data before it was lost again.  As you found, the aircraft was close to the second contact at the end of that line.  Usually when you lose telemetry and the aircraft continues on its way without re-establishing itself, you won't get the extra path indicating where it went.  In this case you were fortunate that it re-established and gave you a clue where to look.

As an aside, you probably lost the aircraft on this occasion by relying on RTH to get the aircraft back home.  In RTH mode the aircraft only flies at about 2/3 power.  This can cause the wind to be more powerful than the return speed, and the aircraft gets "blown away".  If you recognised this at the time, you could have flown it manually, by pushing the stick fully to maximum deflection in the direction you wished to go (home), and it would likely have had sufficient power to overcome the wind.  Other "tricks" include landing in place, where you know the GPS location before it is lost, and physically retrieve it from there.  Another "trick" is to descend to lower altitudes, where wind speeds are usually lower and less likely to be blown away.   RTH may work in these conditions, or manual control would be more effective, as well as having better visibility.
2018-8-8
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