Was working perfectly fine, brought it inside to unload video from card. Brought it back out and now it wont take off and topples over to front right. Obvious answer would be more power to the other three engines or that one being underpowered? What else might it be? Solutions?
http://www.youtube.com/watch?v=De4QvmRgNrE
http://www.youtube.com/watch?v=De4QvmRgNrE