I know I'm not the first person to complain of this, but I've been scouring the forums trying to find answer, and none have pointed to a solution that worked for me. I have a beefy octocopter in an X8 configuration using a Pixhawk and APM firmware 3.3.3. I've been flying in stabilize mode, and whenever I give it a hard yaw left the drone pitches back (nose up) and rolls to the right. Yawing hard to the right does not appear to cause a problem. The same pitching back & up happens when I throttle up very hard as well.
I've tried to address all the possible culprits that other forums have suggested:
- I'd made sure the fore/aft and left/right center of gravity is right in the center of the pixhawk. Thought I believe the up/down COG is below the pixhawk.
- I tuned the RATE_P/I/D for roll and pitch. The copter actually handles really well if all you're doing is pitching and rolling it (and not yawing or being hard on the throttle)
- I've done my very best to make sure there's no arm twist, although it could be I didn't do a very good job at that. So **maybe** that's an issue?
The copter is definitely not lacking in power. It appears to hover around 30% throttle, which I know is a little low. Can that cause issues like this?
Here's a link to a log file (sorry 15mb was too big to attach directly to the post, so here it is in Google drive) from a short flight where I intentionally gave several hard yaw and throttle commands that exhibited the behavior. I tried to analyze the log myself, but I'm no good at this stuff. Maybe someone can help me uncover what's going on?