Auto landing

[genesimmons]

I am surprised that at 6000' you did not see a massive wind warning. There had to be some kind of wind blowing up there, and it also may have created an issue for the drone in regards to the battery levels.

Still amazes me that at that height, it came back down to the correct spot.

On the wind warnings issue I have noticed if I get them a lot on one flight, say more than 4, I can sometimes have some strange issues with the Mavic, mainly gimbal related. But now when I get them, I tend lower my height and things seems to calm down. Not that I have attempted such a flight at that height.

Paul Caldwell

do a google search on u tube, theres vids of mavics going 8k ft and flying around in the clouds,if it can travel 4miles distance tha distance can be up as well i assume

 

[MavicFlyGuy]

Erm... people like you are asking for trouble.

 

[Boss_Vyc]

Yes . It was a bit windy but not extreme.
The problem is that he does in normal flight. That means if it has 40-50% battery and sends it 2km away, it returns with 20-25% battery and landed where it wants. I do not think the wind is the problem.
When I raised it to that height it was cloudless and I could see the sky with everything flying in the area (planes did not fly and I looked at the sky for 20 minutes before). I'm not crazy to send the drones to the clouds without knowing what's out there.
As far as the scroll distance is concerned, it is meant to fly up to 7 km and get back. So whoever criticizes me above is not right about this fact.
In height it is the second time when I rise to over 500 meters.
Again . I'm not crazy and I know what consequences can follow.

 

[genesimmons]

try litchi i think u will be impressed, i find it works great on my phone, less lag as it doesnt take much to run it less bloated, if u have the same issue in litchi then its in your bird, either u accidently changed something when u changed the parameters setting or touched something inside, did u have to do the sd card inside the bird to midify the paremeters

 

[Boss_Vyc]

I do not know exactly if it is from the application. The first time it had this error it was witholder version dji go 4.
The parameters are only changed for gps and sport mode. This is also for altitude. I tend to think it is from firmware. Now it's .400 but today I have not been able to test because the sky was not clean. Some clouds and I did not want to risk a catastrophe for a simple test.
I installed litchi on the phone. I'm going to do a test with it too.
But nobody knows to read the log file to say exactly what's causing this error?

 

[joejaxvic123]

Wow... that's high.

 

[BaNZ]

Good to know that it is still stable and does not drop out of the sky. So I shouldn't worry when I fly up to 400 feet.

 

[genesimmons]

did u get the 700 file from github, theres also a 104,200 file that gives u ability to adjust paremetrs and such and its got the new features like panorama mode which i use all the time, i am usinng it and works great so far

 

[MavicCF]

I do not know exactly if it is from the application. The first time it had this error it was witholder version dji go 4.
The parameters are only changed for gps and sport mode. This is also for altitude. I tend to think it is from firmware. Now it's .400 but today I have not been able to test because the sky was not clean. Some clouds and I did not want to risk a catastrophe for a simple test.
I installed litchi on the phone. I'm going to do a test with it too.
But nobody knows to read the log file to say exactly what's causing this error?

Sorry if I missed this, but does the auto landing only happen when your 6,000 feet up? Say instead you flew 6,000 feet out horizontally would the problem occur? Does it happen routinely with around-the-house flights? I'm guessing it's just the Mavic trying to save itself from a terrible death.

 

[Boss_Vyc]

did u get the 700 file from github, theres also a 104,200 file that gives u ability to adjust paremetrs and such and its got the new features like panorama mode which i use all the time, i am usinng it and works great so far

With fw V01.04.0200 can you activate the panorama? That's cool. Then I'm downgrading it again

 

[Boss_Vyc]

Sorry if I missed this, but does the auto landing only happen when your 6,000 feet up? Say instead you flew 6,000 feet out horizontally would the problem occur? Does it happen routinely with around-the-house flights? I'm guessing it's just the Mavic trying to save itself from a terrible death.

Possible . And i fly around the home and activate RTH or manually returning from about 2 km, when it reaches a value of 20-25% of the battery, it activates the forced landing mode although the distance between the bird and home point is 30-200 meters, so he has enough battery to get back.
If i make a restart on aircraft, then he can fly again with the percentage remaining in the battery.

 

[msinger]

But nobody knows to read the log file to say exactly what's causing this error?

I don't see any errors in your flight log. Your Mavic calculated that it needed to land immediately due to the unusually high altitude. Did you expect it to fly at that high altitude until the battery reached 20-25%?

 

[Boss_Vyc]

I don't see any errors in your flight log. Your Mavic calculated that it needed to land immediately due to the unusually high altitude. Did you expect it to fly at that high altitude until the battery reached 20-25%?

Thanks a lot for the analysis.
Here is a very interesting video.

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He held the bird at 2500 meters up until 45% of the battery and without a connection to the remote for a short while.
Anyway. That's not my big concern because I'm not flying at that height. I'm interested about why he's forced to land when he has enough battery and a little way home.
Meanwhile I'll look for the log file when the drone have enabled force landing at 22%, 80m altitude and 40 meters away from the home point.

 

[genesimmons]

With fw V01.04.0200 can you activate the panorama? That's cool. Then I'm downgrading it again

YES i use panorama every day, i never actually tried 700, i used it as many as a stepping stone to get to what i have now, i think to use it though u need a newish version of dji go, i tried a older version of a modded dji go and it didnt have pano mode,

 

[Boss_Vyc]

I always use the latest version of DJI go 4 plus updates permanently to the NFZ and fly zone database. Changing parameters is from the drone script. Now I do not know what changes I can make in fw 200

 

[MavicCF]

Thanks a lot for the analysis.
Here is a very interesting video.

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He held the bird at 2500 meters up until 45% of the battery and without a connection to the remote for a short while.
Anyway. That's not my big concern because I'm not flying at that height. I'm interested about why he's forced to land when he has enough battery and a little way home.
Meanwhile I'll look for the log file when the drone have enabled force landing at 22%, 80m altitude and 40 meters away from the home point.

The Mavic is always calculating things. It calculated how much battery it used going up and how much it used hovering at that altitude and decided that if it didn't start landing soon it wouldn't have enough battery left to make it all the way back down resulting in a free-falling projectile from several thousand feet. I assume it also calculates in some extra time so it isn't cutting it too close battery wise. You'll notice he did have the option to cancel the landing, which he did, but then immediate brought it down manually because he knew he was running out of time.

 

[Boss_Vyc]

The Mavic is always calculating things. It calculated how much battery it used going up and how much it used hovering at that altitude and decided that if it didn't start landing soon it wouldn't have enough battery left to make it all the way back down resulting in a free-falling projectile from several thousand feet. I assume it also calculates in some extra time so it isn't cutting it too close battery wise. You'll notice he did have the option to cancel the landing, which he did, but then immediate brought it down manually because he knew he was running out of time.

Yes. That's what I say. Here's the option to cancel. I attach 2 pictures one where the option is active and one where the option is inactive.
Also from the second picture, the bird returned exactly to the home point with 17% battery. It does not always force the landing. Still, i think it's a bug somewhere.

 

[Keule]

Still, i think it's a bug somewhere.

No, as @msinger and @MavicCF already posted, the smart.battery calculations / algorithms simply did their job and tried to save the aircraft from falling out of the sky.

The flight controller uses all available parameters such as power consumed, height and many more sensors to 'predict the future'. Which, of course will not work always as the pilot wanted to...

The plot below shows that smart.battery.usefulTime was at some point 422 seconds left, depending on the current flight state. (current altitude, aircraft climbing, motors drawing a specific amount of amps, etc.)
Therefore AutoLanding was initiated as a failsafe mechanism from DJI.

But now, flight parameters changing! (The aircraft is descending, less power is used)
All the predictive calculations were wrong ...
(you can see the plot climbing (usefulTime raising to 1017 seconds))

At the end the aircraft landed safely with 46% juice left.



I see nothing wrong here.

If you want to use the full potential, then you have to modify more in the firmware then only the altitude limit ... Please, do NOT do that!

 

[Boss_Vyc]

No, as @msinger and @MavicCF already posted, the smart.battery calculations / algorithms simply did their job and tried to save the aircraft from falling out of the sky.

The flight controller uses all available parameters such as power consumed, height and many more sensors to 'predict the future'. Which, of course will not work always as the pilot wanted to...

The plot below shows that smart.battery.usefulTime was at some point 422 seconds left, depending on the current flight state. (current altitude, aircraft climbing, motors drawing a specific amount of amps, etc.)
Therefore AutoLanding was initiated as a failsafe mechanism from DJI.

But now, flight parameters changing! (The aircraft is descending, less power is used)
All the predictive calculations were wrong ...
(you can see the plot climbing (usefulTime raising to 1017 seconds))

At the end the aircraft landed safely with 46% juice left.

View attachment 35130

I see nothing wrong here.

If you want to use the full potential, then you have to modify more in the firmware then only the altitude limit ... Please, do NOT do that!

A perfect answer. Now I understand everything. It's still a small bug there because once it increased flight time, normal I should be able to cancel the force landing command.
Thanks a lot for this explanation.
I know I can edit battery parameters but I do not want to work there. At the same time I can set the battery as non-DJI and set the manual voltage warning. This is another solution ,but....Better nor
I will carefully watch my remaining flight time and carefully analyze if it still does this when it flies away. I do not find the 22% forced landing log and a 30 meter home distance.Too many flights lately

 

[msinger]

It's still a small bug there because once it increased flight time, normal I should be able to cancel the force landing command.

It's not possible to cancel the auto landing that initiates when the battery reaches the critically low level. The best you could do is hold the throttle in the full up position to prevent the Mavic from descending.