I have a big problem with my Hexa - 3DR Pixhawk/ 3DR Compas/ T-Motor 4010/ Ztw Spider 30A ESC. / 4S 15000mha

When I arm and start my hexa copter, it starts normaly, but when I raise throtle 4 motors spins aggresive with high rpm and the two left motors just spin slowly. When I give more throtle the copter flips.

I have re-installed 3.2.1, calibrated several times accel, compas all ESC both single calibarion and all calibration.

I had a look in the log file and the DesRoll has constant a value of -30 and Roll value at 0, and follow my throtle input. I asume that this is the reason why the motors act as they do.

Can anyone tell me why the DesRoll starts with the value -30, and what to do?

Best regards

Klaus Buddig

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Please do us a favor and connect to the GCS and have a look in Mission Planner if your horizon is off by 30 degrees in the HUD. We have been having some problems with the Pixhawk and this sounds similar.

Thanks for your response. After connecting to GCS and checked the HUD I could se that everything was OK.

Then I checked all initial settings and I discovered that the radio channel for Roll didn't respond to my radio!. A quick check showed that the channel was mapped wrong on my FrSky radio... I must have done something by mistake a week ago, when a made a copy of the model on my FrSky radio.

Sorry for my first post - My fault ;-)  

Are you running the default RC in channel order?

Yes - now I'm back with the right mapping ;-)

The reason was that I had been playing with some switches that by mistake overwrote the Roll channel with the value zero.

I have a throtle safety switch, overwriting the throttle channel 3 to zero, in order to prevent my throttle stick to set the Pixhawk into ESC programming mode by mistake.

This is a feature that I think is usefull :-)

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