go download your logs have a look at the motors log i am almost sure you will see one racing way ahead of the others this problem occurs when one of the anticlockwise motors loosens its nut and you get no lift from the motor it results in a vertical dive you can not recover from but like i said without looking at the log we can not be sure
Lemee go have a look in Arducopter 2X . Way don't you coppy and past it here as well, No harm done and you will maybe meet some SA people . Ok Albertino ...? pls man
Hey Albertino did you come right;.
I have tried to find your post but there is just soooo many please and soooo many feeds and I don't even know ware to fint it.
send the link or coppy here