"I am liking the enthusiasm to get to the bottom of this issue. I'm a web programmer, so I don't know how much of help I would be on C control system code, but I'd love to make a web app where fellow Arducopter pilots can report control issues and…"
"This is a great answer. I am almost positive vibrations were not an issue. In the 5 seconds or so that the quadcopter was shooting up I lost visual contact with it and needed to bring it down before it got too far away. Also, it didn't shoot…"
"I am sure nothing came loose. The Arducopter was mounted to foam board to lessen vibrations and was still mounted when I recovered the quadcopter. I am thinking something is not right with the barometer. I am staying away from alt_hold for a while…"
I was flying today and all the sudden my quadcopter just took off. I was testing altitude hold mode and it took off. I immediately switched it to stabilize mode, but it was totally unresponsive. It was probably up 300 ft. and drifting, so I cut the…