Mavic Mini Dragged away mild wind

[slup]

my advice is to do hove tests ,
1 take off and watch for excessive drift
2 go to 10ft and do the same
3 30ft
4 50ft
then 70ft
fly at a level that the drone is not draft and that is safe

That will not prove anything ... we have already seen several cases were the AC can fly after a "uncommanded descent" incident ... so the problem will be intermittent --> the Mini isn't safe to fly & if you do you need to be prepared to lose it.

 

[slup]

Have you seen the pictures he attached or not? Two blades seen from the same angle are completely warped.

Yeah ... we have all seen the pics, they are grainy, bad lit, with an unconfirmed angle & from a distance. Nothing can be said out from them nor can it prove anything.

 

[Meta4]

I think the main problem was wind speed, from the log there seem to be a lot of high wind warnings.

My thoughts too ... There have been so many 'new' drone users been caught out by them not realising that the wind-speed at ground level, is nothing like the wind-speed a few hundred feet up!

The problem with this flight was the Mini failing to maintain pitch angle.
It's easily seen in the flight data.
The flyer had the right stick pushed full forward which should have tilted the drone 30° in Sport Mode
Look at this extract from the data for the flight:
The purple column shows the right stick pushed full forward.
The yellow column shows the pitch angle, which should be close to 30°
If the drone can't tilt properly, it can't maintain the speed the pilot is asking from it.

This is one of two fatal flaws that many Minis are showing.

 

[m80116]

Don't worry... everybody with EYES can see the pictures, you're not the only one.




Good props and bad props.

 

[Meta4]

Have you seen the pictures he attached or not? Two blades seen from the same angle are completely warped.
....
MM is a wonderful product as long as it is cared after and known by its limits. Replacing the propellers will 99% likely FIX everything.

Sorry ... I can't see anything conclusive in your pictures.
And I can't see how a Mini could fly perfectly for 10 minutes and then start losing altitude if the propellers are the issue.
Do they go soft during the flight?
If the props are the issue, then it's definitely a serious flaw to provide those props to users.
I'll stick to reading flight data and look for facts rather than guessing.

....
MM is a wonderful product as long as it is cared after and known by its limits. Replacing the propellers will 99% likely FIX everything.

So what would you say about a drone that loses altitude when the pilot pushes the throttle up and/or fails to keep a proper pitch angle when you push the right stick forward.
The Mini is a lemon and DJI still haven't done anything about it after months of seeing them lost every day because of these faults.

 

[unionglzr]

I tried to land in the last minute but instead of activating the landing mode it just bumped to the ground. Could it be because I was using sport mode?
I am a new DJI pilot so I don't know if landing mode activates when it is in sport mode.


Here are the flight logs:




Cheers

not a good statement to make " i dont know if landing mode activates...." should know before you might need.

 

[Meta4]

Listen learned professor with your me attitude and you all are just guessing.... isn't you saying "The problem with this flight was the Mini failing to maintain pitch angle"?

Now all you have to do is explain how a Mini flies properly for 10 minutes and then develops this fault mid-flight.

 

[slup]

Listen learned professor with your me attitude and you all are just guessing.... isn't you saying "The problem with this flight was the Mini failing to maintain pitch angle"?

Go read your data! Give a conclusion as to why it couldn't maintain its pitch. The flight is plagues by ESC errors and the Aircraft rear propellers are MANGLED beyond recognition... now, do you need a .dat file to see the rear motors were maxed or would you resign to an evidence that is overwhelming ?

Clearly you're not helping it here... for what!? Pride of your opinions and ideas, risking another fellow MM pilot's dream!? Ridiculous...

... Evidence that is overwhelming ..?

When it comes to the proof regarding the root cause for incidents like this nothing is overwhelming or clear as of today ... way to much have been contradictory, as pointed out several times, why can't the AC sustain flight just in the end in this particular flight ... or why have we seen instances of incidents like this, but the following flights goes well?

We all can see the AC failing to reach commanded tilt, likewise a heading speed below what's expected ... and if we in this case had access to the DAT we certainly should see rear motors on max.

You seems to have locked your mind on this thread --> The problem of un-commanded descent by Mini reproduced and made up your mind that the problem is solved & started to evangelize with those pictures. The thing is that most of the Mini's that experience this event rarely have had the props squeezed between 2 plates & baked in the oven during 40min in 100C degrees.

Even if the props is a good candidate for the root cause it's not proved ... and on a side note, if this were the case DJI would likely have issued measures by now instead of recommending a full calibration IF the AC is undamaged & IF it's completely lost not possible to recover ... send a replacement without questions asked.

You need to calm down & separate speculation from what's proven facts...

 

[dirkclod]

@Meta4 @m80116 please quit with your going back and forth with each other Now before I stop both of you.
This is not helping this thread.
You have both stated your opinions so No More.
No one have nothing to add then don’t post.

 

[bobshe]

From all the conflicting comments you have all been making and after looking at the setup of the blades on my Mini (which I have only owned for a month but really have not had the opportunity to fly, because of the wind speeds locally, and the virus, of cause) they look to be at the same basic shape if held at the same angle as those in the photos.) So I for one are no further enlightened as to what caused the crash of this Drone. I would really like to find out as if it is some unpredictable fault with the Drone it makes me wonder if I did the right thing by buying this Mavic Mini.

 

[sar104]

From all the conflicting comments you have all been making and after looking at the setup of the blades on my Mini (which I have only owned for a month but really have not had the opportunity to fly, because of the wind speeds locally, and the virus, of cause) they look to be at the same basic shape if held at the same angle as those in the photos.) So I for one are no further enlightened as to what caused the crash of this Drone. I would really like to find out as if it is some unpredictable fault with the Drone it makes me wonder if I did the right thing by buying this Mavic Mini.

There have been a couple of definite observations. Firstly, the props are clearly involved, at least in some cases. A number of users who have consistently suffered from the uncommanded descent/lack of forward pitch problems have fixed them by replacing the rear props. One user demonstrated the effect reproducibly by swapping the props in and out, and between front and rear. Secondly, that cannot be the entire explanation, as noted by the fact that in a number of flights the aircraft initially performs nominally but then exhibits the problem - clearly illustrated in the flight logs.

To me that suggests that it is an interaction of prop deformation and the flight control firmware, and possibly even slight changes is prop geometry during the flight. There are numerous controlled experiments that could be done to nail this issue down, but so far I haven't felt sufficiently compelled to purchase a Mini to experiment on.

 

[hiflyer201]

Time for a recall. Isn't that pretty evident

 

[maverickRKJ]

Hi,
My Mavic mini got blown away by a very mild wind (8-9 MPH) and I could not control it until it crashed.
I was trying to fly against the wind full throttle in sport mode..

What is the problem? Any opinions?

Here is the link to my crash's video:

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Cheers,
Bardia

number 1 reason i never bought a mavic mini

 

[sar104]

Time for a recall. Isn't that pretty evident

Not clear. If the underlying cause is poorly manufactured props then it might be easily fixed.

 

[slup]

...makes me wonder if I did the right thing by buying this Mavic Mini.

Sadly I would never recommend anyone to go for a Mini until the root cause have been addressed for the symptoms we have seen so many times now... the Mini not being able to sustain pitch/lift.

Certainly it's many thousands of Mini's out there that haven't seen these issues that lead to the OP's incident, but the question for those is ... for how long will they escape it?
The props are probably involved ... but that's likely not all as the symptoms have been intermittently showing up ... during the same flight or between different flights.

 

[TDZHDTV]

There have been a couple of definite observations. Firstly, the props are clearly involved, at least in some cases. A number of users who have consistently suffered from the uncommanded descent/lack of forward pitch problems have fixed them by replacing the rear props. One user demonstrated the effect reproducibly by swapping the props in and out, and between front and rear. Secondly, that cannot be the entire explanation, as noted by the fact that in a number of flights the aircraft initially performs nominally but then exhibits the problem - clearly illustrated in the flight logs.

To me that suggests that it is an interaction of prop deformation and the flight control firmware, and possibly even slight changes is prop geometry during the flight. There are numerous controlled experiments that could be done to nail this issue down, but so far I haven't felt sufficiently compelled to purchase a Mini to experiment on.

I’ve been experimenting with taping up the front arms in an attempt to stop my props hitting the AC body. What I have found on the front arms is varying the stiffness/ flex sets up a resonant frequency that manifests in the propellers visually deforming them approx 5 - 7mm in the vertical, when I remove the tape the Mini hovers without issue. May be completely unrelated but it was an interesting observation.

 

[dirkclod]

. There are numerous controlled experiments that could be done to nail this issue down, but so far I haven't felt sufficiently compelled to purchase a Mini to experiment on.

That is why I even bought one to see all these issues that are being posted and I have not experienced none of them
other than the wind issue and figure that just came from inexperienced flyers. Same props on that came with it, no issues with them hitting the body. Not had no sudden drops
in altitude. Have flown over water ,tried all modes .
Have flown in wind I knew I shouldn’t have with it but do
know the limitations with that .
Only thing I don’t do is fly in sport mode.

 

[sar104]

That is why I even bought one to see all these issues that are being posted and I have not experienced none of them
other than the wind issue and figure that just came from inexperienced flyers. Same props on that came with it, no issues with them hitting the body. Not had no sudden drops
in altitude. Have flown over water ,tried all modes .
Have flown in wind I knew I shouldn’t have with it but do
know the limitations with that .
Only thing I don’t do is fly in sport mode.

I believe @BudWalker also bought one and was unable to recreate the issue. Despite that, the logs, especially a couple of DAT files that were retrieved before being vaporized by the Fly app, clearly show a real problem. If the problem centered around some of the earlier batches of props then that might explain why many people are seeing no issues.

I have an idea - hit the sport switch and see if that crashes it¡

 

[dirkclod]

I believe @BudWalker also bought one and was unable to recreate the issue. Despite that, the logs, especially a couple of DAT files that were retrieved before being vaporized by the Fly app, clearly show a real problem. If the problem centered around some of the earlier batches of props then that might explain why many people are seeing no issues.

I have an idea - hit the sport switch and see if that crashes it¡

When I can get back out I will burn all 4 battery's in it.
I do have refresh so if it does no biggie. ?
Added/ Mine Isn’t one of the first batch now that might be
why I haven't seen no issues

 

[dirkclod]

@sar104 Let me clarify I’m not saying there are not issues I’m just not seeing them other than in the data you have
posted about. I do not doubt what you are seeing in the files.
I do trust what you say.