I'm hoping for some help or ideas here. It appears I'm not the only one experiencing this. I've just started testing an R550 hexa frame (X configuration) with an APM2 ver. 2.5.5 . The very first couple of takeoffs were actually quite nice with the default parameters. I don't dare touch them until I've had more successful air time to evaluate performance and flight characteristics. A subsequesnt takeoff resulted in a flip. It was more like the copter wanted to fly but tipped over on its side at takeoff. After replacing props, I went to a larger field to test further but w/o the restriction of a yard full of trees. This is my first multirotor and many years of no RC stick time. I was in Stabilize mode. I ran the props up slowly and just as the thing got light (just under half throttle), it flipped over AGAIN!!! I know it has the ability to fly correctly with the current setup and parameters. It did well on its first couple of takeoffs. I did have to fish it out of the shrubs a couple of times but that was totally my fault from lack of experience. The setup is as follows:
R550 hex frame
2830 1000 KVA motors with 10X4.5 props and hobbywing 30A ESC's
APM2 w/ 2.5.5
Somewhere between 1720 and 1770 grams weight (I don't have a precision scale that goes above 2.2 pounds. I got a bath scale measurement of 3.8 lbs and ranges from 3.8 to 3.9.
I'm looking for some help and possible insight here. I'm not soliciting a lecture on open source code and the perils associated with it. I asked a simple question a few weeks back and got a condescending reply. I'm not looking for that again. I'm just don't want to play Russian Roulette everytime I run the props up.
Help is appreciated as I wait on more props.