Aircraft Max Power Reached?

[deonholt]

Good day and thanks for your help. It felt as if I almost lost my MM Saturday. I got this message in the flight record which I don't understand. I was flying in a 1.9km/h wind which could most definitely not cause a fly away.
I also see high environment interference. There were power lines about 00m from where I was flying. Could it be that?

Then I also got this error: "
Not Enough Force/ESC Error"

I attached the flight record for your advice.

Thank you so long.

 

[sar104]

Unfortunately this is a common problem with the Mini, that seems to be due to poor prop design. They deform with time and then don't produce enough lift. Can you check to see if the mobile device DAT file with a name ending FLY049.DAT is still on your phone - they get deleted pretty quickly by the DJI Fly app.

 

[deonholt]

Unfortunately this is a common problem with the Mini, that seems to be due to poor prop design. They deform with time and then don't produce enough lift. Can you check to see if the mobile device DAT file with a name ending FLY049.DAT is still on your phone - they get deleted pretty quickly by the DJI Fly app.

Thanks for the reply. Unfortunately I don't have that file on my phone. I downloaded all folders through iTunes and only have FLY057.DAT

 

[sar104]

Thanks for the reply. Unfortunately I don't have that file on my phone. I downloaded all folders through iTunes and only have FLY057.DAT

OK - just trying to get as many DATs as possible for these events, since they contain the motor data that are missing from the txt logs.

The pragmatic solution is to replace the props, but that's only a temporary solution unless the design changes - it will happen again.

If you do a forum search for "uncommanded descent" you will find multiple reports of this problem.

Search results for query: mini uncommanded descent

mavicpilots.com

 

[deonholt]

OK - just trying to get as many DATs as possible for these events, since they contain the motor data that are missing from the txt logs.

The pragmatic solution is to replace the props, but that's only a temporary solution unless the design changes - it will happen again.

If you do a forum search for "uncommanded descent" you will find multiple reports of this problem.

Search results for query: mini uncommanded descent

mavicpilots.com

Ok, thanks. I have attached the only DAT-file I could find. With what software do you analise them?

 

[deonholt]

OK - just trying to get as many DATs as possible for these events, since they contain the motor data that are missing from the txt logs.

The pragmatic solution is to replace the props, but that's only a temporary solution unless the design changes - it will happen again.

If you do a forum search for "uncommanded descent" you will find multiple reports of this problem.

Search results for query: mini uncommanded descent

mavicpilots.com

I downloaded the DAT to CSV converter and don't have a clue on how to interpret it. ? I did not know they are recording so much data. It simply is overwhelming.

I had a look at the props and they are fine. No dents or damage at all.

Thanks again.

 

[sar104]

I downloaded the DAT to CSV converter and don't have a clue on how to interpret it. ? I did not know they are recording so much data. It simply is overwhelming.

I had a look at the props and they are fine. No dents or damage at all.

Thanks again.

The damage is apparently not visible - it's just a subtle change in the 3-D shape.

 

[sar104]

Ok, thanks. I have attached the only DAT-file I could find. With what software do you analise them?

I use DatCon followed by Igor Pro.

 

[bumper]

I downloaded the DAT to CSV converter and don't have a clue on how to interpret it. ? I did not know they are recording so much data. It simply is overwhelming.

I had a look at the props and they are fine. No dents or damage at all.

Thanks again.

Just a WAG, as I don't own a Mini, but just going by a visual prop inspection may not be enough. The problem could well be a change is the mechanical or elastic properties of the prop, with a decrease in the blade's resistance to torsional loading. Compare the amount of torque it takes to twist the end of the prop to "flatten" it. If this is different on a new prop vs used one, then the prop will be reducing or flattening its pitch in flight - the more loading, the less efficient the prop would become in harnessing the motor's power.

 

[sar104]

Just a WAG, as I don't own a Mini, but just going by a visual prop inspection may not be enough. The problem could well be a change is the mechanical or elastic properties of the prop, with a decrease in the blade's resistance to torsional loading. Compare the amount of torque it takes to twist the end of the prop to "flatten" it. If this is different on a new prop vs used one, then the prop will be reducing or flattening its pitch in flight - the more loading, the less efficient the prop would become in harnessing the motor's power.

That or gradual permanent flattening are good candidates.

 

[atsphenomenon]

In which case, has anyone found any reliable after market props.

 

[fificap]

I downloaded the DAT to CSV converter and don't have a clue on how to interpret it. ? I did not know they are recording so much data. It simply is overwhelming.

I had a look at the props and they are fine. No dents or damage at all.

Thanks again.

Give a try to this fix. Change propellers and give us feedback.

@+

 

[deonholt]

I use DatCon followed by Igor Pro.

Last favour ... if you don't mind.
I want to learn. I have downloaded DatCon 3.7.1 and Igor Pro 8.
In DatCon I opened up the *.DAT file. What do I do from there, since I see that Igor only opens *.pxp & *.uxp files

Thank you so long.

 

[sar104]

Last favour ... if you don't mind.
I want to learn. I have downloaded DatCon 3.7.1 and Igor Pro 8.
In DatCon I opened up the *.DAT file. What do I do from there, since I see that Igor only opens *.pxp & *.uxp files

Thank you so long.

Igor will load almost any kind of data:

 

[deonholt]

Igor will load almost any kind of data:

View attachment 93626

Thanks. I don't manage to get those results with txt, csv or DAT files. I will need to do some studying.

 

[sar104]

Thanks. I don't manage to get those results with txt, csv or DAT files. I will need to do some studying.

You mean you can't load the data after converting the logs to .csv files?

 

[unionglzr]

Unfortunately this is a common problem with the Mini, that seems to be due to poor prop design. They deform with time and then don't produce enough lift. Can you check to see if the mobile device DAT file with a name ending FLY049.DAT is still on your phone - they get deleted pretty quickly by the DJI Fly app.

why would they quickly delete .

 

[Mac Man]

Unfortunately this is a common problem with the Mini, that seems to be due to poor prop design. They deform with time and then don't produce enough lift. Can you check to see if the mobile device DAT file with a name ending FLY049.DAT is still on your phone - they get deleted pretty quickly by the DJI Fly app.

I have seen you ask others for the mobile device DAT file. What are you looking for in that file? What additional information does it contain? Thanks

 

[sar104]

why would they quickly delete .

I don't know. Perhaps to save space? The DAT files are much larger than the txt logs. But it's been clearly established that the DATs are being deleted.

 

[sar104]

I have seen you ask others for the mobile device DAT file. What are you looking for in that file? What additional information does it contain? Thanks

The DAT files contain several kinds of data not in the txt log - but notably the raw sensor data from the IMU (rate gyros, accelerometers, magnetometers), the motor data (speed, current, demand etc.), and the GPS data.