Hi,
Finally I have tried to fly my quad with some precautions (see video
https://www.dropbox.com/s/fkjkc36wjb25xmf/DSCN8737.MOV ) and the behavior is the same that I can see in the last video. I suppose that I have to work to eliminate MAG interferences. I will try to put a EMI shield between the FC and the ESC 4in1 or relocate it in another place. Further more there are two things I have seen in the test. The first one is that the polycarbonate arms weren't a good choise because despite of polycarbonate is a hard light material, it has a little flexibility that is not good to reduce the vibrations. It was something I feared. I'm going to replace them by aluminium arms. The second thing that I can see, but not always, is that one motor don't react when taking off.
Any suggestion?
Thanks,