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LOST MY MAVIC AIR TODAY-Need Help
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2370 101 10-27 02:09
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TechVoyager
lvl.4
Flight distance : 4993

India
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Hello friends,
Yesterday night i updated my remote and MA with the latest. 500 firmware. Today i tried to flew it on a hill point view called "Nandi Hills". Just after the takeoff of nearly 100fts approx, the MA started drifting far away from us.. Within a matter of nearly 2 mins it drifted to approx 2kms distance from us. We doubted it to be the high speed wind at the mountain. I tried to bring back the drone back to us via manually controlling but it was not responding to me except the top-down and left-right gimbal movement, the forward backward or up down buttons response was not happening. We assumed its because of the wind speed. Out of panic, i pressed RTH twice after 10-20 secs interval because upon RTH also the drone didnt seem to move towards us. Then i switched to sports mode and tried to regain control but that also didnt moved the drone towards us.. Finally drone went into critical low battery, i quickly tried to have a look of the bottom environment, so that it can be easily retrieved but as the drone was at more height and the battery already drained out, i couldn't figure out the exact location. Based on the last gps location shown in the find my drone (13.361920, 77.658365)  When we saw in the map it looked like a open area but when we reached the exact location it was full of trees and farm plantation. We tried searching for 2 hrs but didn't find it .I somehow feel that the location may not be correct.  Can someone help me in pinpointing the approx location based on the speed, altitude, wind velocity parameters recorded by the drone. Please let me know where can I find the flight logs and data so that I can upload those so that a some expert from you can help me find my drone. Also you guys can help me in finding what exactly happened and what went wrong. Was it the firmware, was it the wind or was it the connection problem.Please help.
10-27 02:09
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Suren
Captain
Flight distance : 1163948
South Africa
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Sorry about that Bud, upload your flight log to the link below and post that link back here
http://www.phantomhelp.com/LogViewer/Upload/
10-27 02:31
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Lucas775
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How many satellites did you have before take off?
10-27 02:32
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TechVoyager
lvl.4
Flight distance : 4993

India
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Suren Posted at 2018-10-27 02:31
Sorry about that Bud, upload your flight log to the link below and post that link back here
http://www.phantomhelp.com/LogViewer/Upload/

Thanks where i will get the flight log.. I have samsung galaxy s7 edge (android 8)? Any path?
10-27 02:36
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TechVoyager
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Lucas775 Posted at 2018-10-27 02:32
How many satellites did you have before take off?

Sorry i didnt noticed that.
10-27 02:37
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TechVoyager
lvl.4
Flight distance : 4993

India
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Final clips from mavic air

Here are the final clips:


10-27 02:41
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TechVoyager
lvl.4
Flight distance : 4993

India
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Also few things to note here is that-
A) the hilltop was quite windy
B) i didnt get any high wind velocity warning in the entire flight
C) the aircraft was not responding to my controls except for the gimbal movements
D) yesterday after updating the remote firmware, i tried resetting it to factory defaults which always failed through dji assistant upon multiple trials.
E) return to home didnt initiate any kind of movement, not sure it was due to wind or some other issue
10-27 03:02
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TechVoyager
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India
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Where to find the flight logs on android phone? Path?
10-27 03:04
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Keule
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TechVoyager Posted at 2018-10-27 03:04
Where to find the flight logs on android phone? Path?

Just follow the instructions in the link given in post #2
10-27 03:06
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TechVoyager
lvl.4
Flight distance : 4993

India
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Here is the flight logs uploaded.
http://www.phantomhelp.com/LogViewer/S8NHO1V3NJH7NRGU8G4L/
Please help in locating it and finding the root cause. I can go looking for the drone again tomorrow. Please help.
10-27 03:13
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Keule
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You flew your aircraft at wind speeds largely exceeding Mavic AIR's capabilities ...
It drifted with the wind in SW direction

10-27 03:19
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TechVoyager
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Flight distance : 4993

India
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10-27 03:27
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TechVoyager
lvl.4
Flight distance : 4993

India
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So is wind the reason for it not able to return to home or respond to my remote commands? Why didnt i get high wind velocity warnings?
10-27 03:28
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Keule
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Your RC contact broke at the last known position with battery level at 2%.
In GO4 use 'Find my Drone' to retrieve the last known position.
From there, proceed to WSW to SW direction because the drone drifted in that direction due to strong wind.

Have a look:

10-27 03:30
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TechVoyager
lvl.4
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Can we get approximate longitude and latitude for your suggested location?
10-27 03:38
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Keule
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TechVoyager Posted at 2018-10-27 03:28
So is wind the reason for it not able to return to home or respond to my remote commands? Why didnt i get high wind velocity warnings?

Yes - as the Mavic AIR is only capable flying 29 km/h in P_GPS. It was unable to fight the wind and return to home.
In Sport mode the speed would be higher, (68 km/h) but i highly doubt that the aircraft would make it home.

And you did not engage S mode anyhow. EDIT: correction - Sport was engaged at T=1:51 and T=5:06

The first warnings appeard at 25 sec in flight and continued until the end of the log:
Here the beginning:


10-27 03:40
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TechVoyager
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But i switched to sport mode on remote... Why it didnt engage then?
10-27 03:44
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TechVoyager
lvl.4
Flight distance : 4993

India
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Is there any way to pinpoint its exact location? I just want to retrieve my baby
10-27 03:45
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Keule
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TechVoyager Posted at 2018-10-27 03:44
But i switched to sport mode on remote... Why it didnt engage then?

Uups - I had not seen that log entry (T=5.06)
But 53 seconds later the flight controller was in RTH mode. That means Sport mode disengaged and the aircraft tried to fly home at P_GPS speed. (29 km/h)
10-27 03:52
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Keule
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TechVoyager Posted at 2018-10-27 03:45
Is there any way to pinpoint its exact location? I just want to retrieve my baby

This is only a very rough estimate!
Begin your search at:         13.361920,77.658365 and proceed towards  13.361915, 77.656839

Good luck!
10-27 03:56
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JJBspark
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Flight distance : 201689
Netherlands
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Hi,

My guess is   at the end of the yellow line. Good luck finding your drone.

And yes, too much wind to handle, drifing 260 with a home heading of 75.

cheers
JJB
analysis1.png
analysis2.png
10-27 04:06
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Alex B.
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Flight distance : 307806

Spain
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Sorry for your loss. I hope that you find it.
For the future use an app like uavforecast, it tells you the exact wind speed at the location where you are + it tells the wind speed at all the different altitudes, very usefull application.
Please never take off with such strong winds, the end result will always be the same, loss of the drone!
It just can’t handle such strong winds.
I also lost my first spark because of very strong winds that took it away from me forever

Fly safely all
Alex
10-27 04:10
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TechVoyager
lvl.4
Flight distance : 4993

India
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Thanks everyone for your time and help. I will go again tomorrow morning and try to search. Problem is that its a vast farmland full of bushes and vegetables plants and trees, we cant see anything even if it has fallen just few meters away from you and you can hardly walk + the farmers dont want you to spoil their plants if you try to walk across the farm. Still i will give another chance tomorrow.
10-27 04:15
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TechVoyager
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JJBspark Posted at 2018-10-27 04:06
Hi,

My guess is   at the end of the yellow line. Good luck finding your drone.

Jjb spark.. Thanks for your response.. Based on this data and your experience can you guide me to an approx possible crash location. In which direction i should look, possibly how many meters? Any lat, long?
Plz
10-27 04:18
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JJBspark
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Netherlands
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TechVoyager Posted at 2018-10-27 04:18
Jjb spark.. Thanks for your response.. Based on this data and your experience can you guide me to an approx possible crash location. In which direction i should look, possibly how many meters? Any lat, long?
Plz

Hi,

Guess you know that area better than i do, so end of the yellow is the landings spot.
Or earlier when that zero battery value becomes really zero

I can see a 'road' there, must be not that hard to go there.
cheers
JJB
10-27 05:29
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Lucas775
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Let us know if you find it.
10-27 05:47
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TechVoyager
lvl.4
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India
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Sure brothers.. Pray for me.. I was totally disheartened by this incident. Hopefully i will find it tomorrow in a good shape.
10-27 05:53
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Keule
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According to Google Earth your last known position was at 13.361920,77.658365 ~170m AGL.
The aircraft was already in Forced Landing Mode and would not attempt to go home, only descending vertically.
Airdata's wind calculator might be not correct with your negative height (-250m below take off point) but we can assume strong wind from NE.
Therefore there is a high possibility that the aircraft is being blown backwards (to SW)

Looking at the remaining battery, there is also high possibility that the aircraft shutdown completely before it reached the ground and crashed.



Here the map with the .KML data from your logs. Start searching at the east tip (Last known location) of the green triangle an continue looking to the western part.
10-27 06:02
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CoreyB10
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Keule Posted at 2018-10-27 03:19
You flew your aircraft at wind speeds largely exceeding Mavic AIR's capabilities ...
It drifted with the wind in SW direction

Oh dear. Someone didn't look at the manual on page 47 where it states -

Flight Environment Requirements
1. Do not use the aircraft in severe weather conditions. These include wind speeds exceeding 10 m/s, snow, rain, and fog.

General rule of thumb - 15mph winds is the limit for the Air. Yes, It can handle a little more but you may end up as per this post.
Hope TechVoyager manages to find it and use this as a lesson learned.
10-27 06:15
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bbloomquist
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JJBspark Posted at 2018-10-27 04:06
Hi,

My guess is   at the end of the yellow line. Good luck finding your drone.

JJBspark,

Which program are you using to analyze the flight log?

Thanks
10-27 07:17
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JJBspark
Captain
Flight distance : 201689
Netherlands
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bbloomquist Posted at 2018-10-27 07:17
JJBspark,

Which program are you using to analyze the flight log?

Hi bbloomquist,

this one (for Windows)....  https://forum.dji.com/thread-145649-1-1.html

cheers
JJB
10-27 10:05
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hallmark007
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TechVoyager Posted at 2018-10-27 05:53
Sure brothers.. Pray for me.. I was totally disheartened by this incident. Hopefully i will find it tomorrow in a good shape.

Hope you find it, particularly if you have care refresh. Looks like wind was your nemesis, wind can do some very strange things around mountains.
10-27 10:52
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JJBspark
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hallmark007 Posted at 2018-10-27 10:52
Hope you find it, particularly if you have care refresh. Looks like wind was your nemesis, wind can do some very strange things around mountains.

Hi hallmark,

Cannot you find a more friedly Greek goddes ; she is a ruthless goddess acting with "avenging justice" wich is not the case i think....  

cheers
JJB
10-27 11:19
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hallmark007
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JJBspark Posted at 2018-10-27 11:19
Hi hallmark,

Cannot you find a more friedly Greek goddes ; she is a ruthless goddess acting with "avenging justice" wich is not the case i think....  

I think when flying in the mountains depending on which side of the mountain you fly, it can be very windy or very calm.

The speed and direction of the wind can be unpredictable in the uplands. As the moving air is pushed over a mountain range it is squeezed between the mountains and the top of the troposphere, causing the wind to speed up. It is nearly always windier, therefore, on mountain tops than in adjacent valleys. The wind is forced over ridges and through saddles, increasing in speed, and making these places more hazardous in stormy weather. The topography of the valleys and mountains often means the wind can be gusting, swirling about and rapidly changing direction, adding to the difficulties of keeping your balance and stability.
10-27 11:52
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bbloomquist
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Flight distance : 66873

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JJBspark Posted at 2018-10-27 10:05
Hi bbloomquist,

this one (for Windows)....  https://forum.dji.com/thread-145649-1-1.html

Thanks I'll give it a whirl
10-27 12:28
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InvisibleName 7
Second Officer
Flight distance : 184662
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CoreyB10 Posted at 2018-10-27 06:15
Oh dear. Someone didn't look at the manual on page 47 where it states -

Flight Environment Requirements

Hey, he didn’t even do the basics and check for a decent number of satellites.  Sorry for the loss but there were some pretty fundamental mistakes made with this flight. If you find your drone, or buy another, do some (a lot) more reading before you go flying again.
10-27 13:30
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HedgeTrimmer
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hallmark007 Posted at 2018-10-27 11:52
I think when flying in the mountains depending on which side of the mountain you fly, it can be very windy or very calm.

The speed and direction of the wind can be unpredictable in the uplands. As the moving air is pushed over a mountain range it is squeezed between the mountains and the top of the troposphere, causing the wind to speed up. It is nearly always windier, therefore, on mountain tops than in adjacent valleys. The wind is forced over ridges and through saddles, increasing in speed, and making these places more hazardous in stormy weather. The topography of the valleys and mountains often means the wind can be gusting, swirling about and rapidly changing direction, adding to the difficulties of keeping your balance and stability.

As the moving air is pushed over a mountain range it is squeezed between the mountains and the top of the troposphere, causing the wind to speed up.

Please provide Link(s) to where it states wind speed increases due to air being squeezed between mountains and "top of the troposphere".
10-27 15:03
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hallmark007
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I’m asking for the last time stop trolling me and trying to turn this thread into something it’s not. Have a bit of respect for the OP. Now skip along, I won’t be answering any of your daft and off topic questions.
10-27 15:20
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HedgeTrimmer
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hallmark007 Posted at 2018-10-27 15:20
I’m asking for the last time stop trolling me and trying to turn this thread into something it’s not. Have a bit of respect for the OP. Now skip along, I won’t be answering any of your daft and off topic questions.

Lots of things hallKing007

1) Not my fault that people post something to a thread you have posted in, moving thread to Top, with said thread then slowing moving downward as people post to other threads.
2) You think far to highly of yourself.
3) Not my fault you post some B.lowing S.moke stuff.  And I ask you to back it up, and you can't.
4) Your attempts to blame me, fall right back on you.  You are one introduced B.lowing S.moke stuff about why wind speed increases.
5) Very lame attempt to play victim, being you are King of Trolls.
6) And, I will challenge you when you post B.lowing S.moke stuff.  Not for myself, but for others who may read your B.lowing S.moke and make mistake of thinking you are correct.
7) We all have a responsibility to stomp down Internet Myths, which spread to eventually become self-sustaining Faux Facts.


Now, if you can politely provide Link(s) as I politely asked.   If not, Deal with it.

10-27 15:44
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fansd024f813
Second Officer
Flight distance : 485981
Australia
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Google it. For your ref call Mountain waves. https://en.m.wikipedia.org/wiki/Lee_wave
10-27 18:05
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