Hello, I have recently finished my build, I still have no FPV cam on it though, I'm waiting for the package to arrive. I already flew the quad a couple of times and crashed it unfortunately, yet it had no visible damage, everything was working ok ... Today I kinda crashed it VERY hard and after the crash the quad started to tilt to right automatically, and wobble as soon as it got in mid air. I accelerated the motors one by one to see if it had any damage, I hear nothing. But as soon as I push it into mid air, it starts wobbling and tilting to right, also making a very ugly noise, like it would have tension loss or something. I really don't know what could be wrong, I would say the motors or the batteries. Although, I pushed each motor at 100% to see if there's a vibration or noise, there's none, but there is after it gets in mid air. Video of it: More detailed video of the noise: **The opposite motor is doing the same noise! http://imgur.com/af57xQI PS!!! The motor isn't making that noise when accelerated independently!!!