I’m quite new at this still so I hope a log analysis is the best place to start tracking this problem down. I’m flying an Ardupilot 2.6 on a X configuration quad. The last time I flew about a week ago, things were just fine. Yesterday I added my new 3DR data radio and I upgraded to ArduCopter 3.1.1 from 3.1. Today when I tried to fly, the quad tilts forward to the point that the front blades touch the ground. Even if I try to pull the pitch back, I can’t lift off. I tried to get back to the last known functioning state by removing the 3D radio but that had no effect. On my last attempt, I set logging to “nearly all”. From what I can see, the logs reflect everything I’m seeing but I can’t tell WHY the quad is tilting forward. I’ve tried recalibrating a number of times with no change in behavior. I haven’t logged the motors before so I don’t know what is normal, but it seems strange to me that Mot1 and Mot2 are almost exactly the same values and Mot3 and Mot4 are the same but Mot1 & 2 always start to go higher around 1450(units?). If 1 and 2 were on the back, that would make sense but that numbering doesn’t coincide with the motor layout as seen in copter.ardupilot.com/wp-content/ … AD_enc.jpg
I don’t know what else to try at this point so I appreciate any help for a noob.
jschall, thanks for the quick response. I’m not sure how those might have changed because I haven’t done any PID tuning, at least not lately. On my last flight I did try Autotune but didn’t complete the process. Hopefully partial settings weren’t saved. In any case, I’ll make and test these changes tomorrow since it’s dark out now. Thanks!
This solved my problem. Thanks! I’m not sure how my quad was flying before because I know I made successful flights with these settings. I accidentally marked my response as the solution, but of course your reply about the rate gains was the actual solution.
