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Strange flight behaviour, PLEASE, help

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Mitglied
Registriert seit: Nov 2011
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Hi,
Yesterday I had two nice flights with two interesting events durring flight.
My quad just jumped suddenly, very violent with AH on.
Switched back to manual and landed. Shacking knees....

First flight, at min 2:53
https://youtu.be/0rSx0zeRPoA

Second flight, same behaviour , more violent, at min. 1:08
https://youtu.be/58FQj0kVVMc

This is what I've found on GPXviewer (second flight):
http://danielchindea.ro/error.jpg

Anyone had this before. What can it be?

Here are GPX files from this flights:
http://danielchindea.ro/gpx.zip

Thank for your help.
Mitglied
Registriert seit: Jun 2013
Beiträge: 1224
Ort: Luxembourg
Hejsan

gruianostu meinte
This is what I've found on GPXviewer (second flight):
http://danielchindea.ro/error.jpg

Anyone had this before. What can it be?

Thank you for providing the GPX files makes it easier. As you show there is a huge change in altitude at record 104.

You are using FlightCtrl V2.2, have you correctly covered the pressure sensor with foam? If it has no cover wind gusts can give faulty readings.

I have used a piece of foam from a 0.10 € kitchen sponge, it has worked well for 5 years.

Feel free to answer på svenska.
Mitglied
Registriert seit: Nov 2011
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Hi Foersom,
No, my sensor is not covered with foam. I though the new ACC sensor is taking control over the presure one.

"The ACC adapter is connected via three wires to the FC (plus, minus and signal). Since the output of the old sensor (LIS344) has with 100k a very high impedance and the new has a low impendance, the outputs of the sensors can be directly conneted together. Only the signal of the new sensor will dominate. "

So, I've cover it now and I wait for good weather to make a test.
Thank you very much. Hope this is the cause.
« Bearbeitet von gruianostu am 17.08.2016 18:14. »
Mitglied
Registriert seit: Jun 2013
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gruianostu meinte
No, my sensor is not covered with foam. I though the new ACC sensor is taking control over the presure one.

"The ACC adapter is connected via three wires to the FC (plus, minus and signal). Since the output of the old sensor (LIS344) has with 100k a very high impedance and the new has a low impendance, the outputs of the sensors can be directly conneted together. Only the signal of the new sensor will dominate. "

So, I've cover it now and I wait for good weather to make a test.
Thank you very much. Hope this is the cause.

Good luck, please write again if that solved the problem, always good to see a follow-up to problems.

Air pressure sensor and ACC two different functionality. The ACC upgrade to FlightCtrl V2.2 is just a more accurate chip than the original ACC. It makes soft landings much easier.
« Bearbeitet von Foersom am 18.08.2016 07:23. »
Mitglied
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Yes!
The foam solved the problem. Thank you for your suggestion.
The only problem I have now is the yaw.
Flying straight, the yaw is "swinging"...left-right, by itself. Not much but anoying. Maybe max. 3-4 degrees.
It is some solution to reset the compass?
Thank you
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gruianostu meinte
The foam solved the problem. Thank you for your suggestion.

That is great!

gruianostu meinte
The only problem I have now is the yaw.
Flying straight, the yaw is "swinging"...left-right, by itself. Not much but anoying. Maybe max. 3-4 degrees.
It is some solution to reset the compass?

When you go to a new location or if you suspect compass to be imprecise, I would recommend to re-calibrate.

If the compass is not proper calibrated, it is difficult to turn to a precise degree, the micro-copter seems to readjust back after you try to do small yaw (~5 degree). Use a (classic) compass to calibrate in proper direction.

Another possible cause can simply be wind. When you fly with manual stick operations, wind may push it sideways while you fly forward. If you want to film and fly as precise as possible, I would recommend to fly using single points, wiki
Mitglied
Registriert seit: Nov 2011
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Hi,
I've tried to fly with waypoints but the copter doesn't remember the heading....only the position and altitude.
Am I doing something wrong. I have followed the steps from Holger youtube video.
MikroKopter: Storing Waypoints during flight (https://www.youtube.com/watch?v=zx81IIoEBnQ&list=UUXv7l7VoJSViTQ6skMGmuSg&index=3)
Thank you.
« Bearbeitet von gruianostu am 22.08.2016 19:31. »
Mitglied
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Carefree On???
Mitglied
Registriert seit: Nov 2011
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No.
It doesn't say anywhere about carefree...
Only about switch to CH to engage the waypoints flight.
Mitglied
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For Heading, Carefree must ON!!!
Mitglied
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solutionxxl meinte
For Heading, Carefree must ON!!!

I didn't know that.
Thank you very much.
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Registriert seit: Nov 2011
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Foersom meinte
gruianostu meinte
The foam solved the problem. Thank you for your suggestion.

That is great!

gruianostu meinte
The only problem I have now is the yaw.
Flying straight, the yaw is "swinging"...left-right, by itself. Not much but anoying. Maybe max. 3-4 degrees.
It is some solution to reset the compass?

When you go to a new location or if you suspect compass to be imprecise, I would recommend to re-calibrate.

If the compass is not proper calibrated, it is difficult to turn to a precise degree, the micro-copter seems to readjust back after you try to do small yaw (~5 degree). Use a (classic) compass to calibrate in proper direction.

Another possible cause can simply be wind. When you fly with manual stick operations, wind may push it sideways while you fly forward. If you want to film and fly as precise as possible, I would recommend to fly using single points, wiki


I did the calibration and I reduced Compass Effect in KopterTool-Miscelaneous, from 64 to 10.
It's working. I'm not sure if the calibration or small compass effect did the fix.
https://youtu.be/XJp9LCYCb80

It's possible to find, somewhere, some info about AH fine tunning?
Thank you, great guys.
Mitglied
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gruianostu meinte
I did the calibration and I reduced Compass Effect in KopterTool-Miscelaneous, from 64 to 10.

I am not sure what you mean with compass effect 64 to 10. Before start earth field (magnet field) should be ~100% and inclination should be circa same as the theoretical number in parentheses. Inclination depends on your location, for Göteborg it is 71 degree.

Wiki checking magnet values.

More about compass values.

gruianostu meinte
It's working. I'm not sure if the calibration or small compass effect did the fix.
https://youtu.be/XJp9LCYCb80

Looks good! You are flying without problems.

gruianostu meinte
It's possible to find, somewhere, some info about AH fine tunning?

I am not sure what fine tuning altitude-holding means.
« Bearbeitet von Foersom am 22.08.2016 21:09. »

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