Problem in position hold

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Problem in position hold

Postby Sebbolino » Fri May 10, 2013 10:18 pm

yesterday i finished the calculation for my hexacopter.

Here is the hardware:

MT2216-900kv
11x5 Graupner E-props
F20 with SimonK
3s 5000mAh.
FRsky D4R-II
Telemetry: 3DR 433Mhz clone from Rctimer
AUW: 2,5Kg in total, 700gramm waterbottle included

first of all, i started with 4s 5000mAh, but it looks like a little bit overpowered, therefore i switched over to 3s.
manual mode seems to be very stable, checked the throttle factor with 0,7... log tells, it's ok.

Here is a video, you can see my copter. At 2:16 i don't know why, but the copter yaw without stick input. I switched over to manual mode for safe landing the hexa. http://www.youtube.com/watch?feature=pl ... X9fX7xfYx0


My log files: https://dl.dropboxusercontent.com/u/192 ... 14-AQL.LOG

I appreciate if someone can take a look at my logs and can tell me whats going wrong.


Regards

Sebastian
Attachments
Foto 10.05.13 23 37 10.jpg
Sebbolino
 
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Re: Problem in position hold

Postby chschmid » Fri May 10, 2013 11:28 pm

Sebastian

Some of your motors are working harder than the others. I guess the harder working motors just could not keep jaw at the windgust. Furthermore your jaw OM locked jaw control @ -160.
How does your mixing table look? All your motors should work more or less at the same PW in hover.

Unbenannt.png


Best
Christof
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Re: Problem in position hold

Postby Sebbolino » Fri May 10, 2013 11:38 pm

i just take the mixer table from the new qgs. I'm sorry, but i'm not so experienced that i can read log file correct.
I modified a little bit.
Attachments
Foto 11.05.13 00 48 23.jpg
mixing table.JPG
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Re: Problem in position hold

Postby Kisssys » Sat May 11, 2013 1:45 am

Christof is right, your CW motors are working much harder than you CCW motors. I doubt you could keep it straight at all with an incorrect mixing table.

Look and see if all your motors are perfectly level. If they all look good to the eye then take a motor and tilt it slightly in the direction you need more yaw. It doesn't take much, a couple of degrees will do it. Keep looking at the logs until all the motors are averaging the same power.
Steve
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