Because of some problems with the SBus upgrade, I decided to completely wipe out and start over on my 2.6. When going out for first test flight tonight, I was really pleased with how well it took off and hovered! Actually even better than before when using the parameters which I had spent some time tuning. So stabilize mode was great, a little more aggressive in the rates than I like or remember them being before the rebuild, but just fine for a first flight.
The first time I put it in to loiter it was only about ten feet off the ground and right over the initialization point. It seemed to be fine although I only left it on for a second. After climbing and moving a ways away, I tried loiter again and it took off to the north VERY fast, i switched to stabilize, brought it back closer, then went to RTL mode, and same thing! It was booking it away. I barely managed to figure out the orientation enough to bring it back home, but I did manage to bring it back and land safely.
What are the possible causes of this? I just want to get some input before I go out and try again. A couple of things that I did fix already were the compass orientation, it was configured as an internal compass when actually needs to be external with a 180 roll. That and then I also adjusted the declination based on the provided declination website on mission planner. Do you guys think that this was my only problem? Or does it sound like something else? Thanks for any advice.