Hi guys, I'm a newbie. I just bought two used Phantoms. One is a phantom 2 vision plus which fly's great. The other is a Phantom 2 which had two motors which wouldn't spin. I found it had two burnt esc cards which I bought and soldered on. All motors run, I did calibrations with the software and gps tuning but I can not get it to fly off the ground. when I raise the throttle like I do with the other it just doesn't seem to get up to speed, when I throttle in a different direction the speed increases but it then tumbles all over. Any Idea's or help guys?