When trying to takeoff in Alt-Hold, sometimes my motors surge, and the heli jumps about a foot in the air very fast. This has not been a problem, as I usually just handle it by continuing to gain altitude and the heli settles out and flies normal. I'm guessing this has to do with some kind of pressure change in the atmosphere before takeoff?
Well This time, my heli just flipped over on takeoff. There was really nothing I could do, and no time to react. I've had many flights with this heli flying fine... and I replaced propellers and the heli flew fine after. So it was not a propeller or motor mistake. I'm stumped as to why this happened...
I've also had this same thing happen on a little quad I have APM copter on. One time during takeoff, it just flipped right away. This happens after many successful flights, and the quad flew fine after the incident with no changes to configuration.
Can anyone tell my why this happens? Why does sometimes APM copter just decide to flip on takeoff?
I've attached the data-flash log for review. Any help with this issue would be greatly appreciated.