I’ve been working on getting a quad plane to perform an auto mission correctly for about 8 months now and crashed 3 birds so far. It’s the same problem for all the aircrafts, when auto is selected the vtol climbs to the desired altitude, attempts to transition and then tumbles out of the sky right at the beginning of transition. It seems to prefer a backflip for some reason but it looks like the motors are just shutting down, interestingly the pusher motor was only activated in some of the log files but not all. I have plenty of log files from separate flights on different firmwares and videos as well. I feel like I have a pretty good understanding of all of the parameters by now so I must be missing something obvious or purposefully setting something up wrong. I’ve tested multiple firmware versions including the most up to date version.
I can confirm that it is not a hardware problem as in the attached log file I was able to regain control before the vtol crashed by switching into QSTABILIZE mode. I can also confirm that all the control surfaces are in working order with plenty of throw before each test flight.
At first I thought the culprit was setting the Q_ENABLE param to 2 instead of 1 since after make this change I had my first successful flight on a small scale airframe operating without an airspeed sensor. Unfortunately after moving to a larger airframe the issue returned even with that param set correctly.
This issue has been pretty consistent on multiple firmwares as well as on multiple pixhawks/gps modules and air frames. At this point I’m convinced it has something to do with the way I’m setting up the pixhawk, there must be an obvious parameter I have incorrectly set. I don’t think it’s as simple as a compass calibration that could cause this drastic of a failure.
I suspected it could also have something to do with how the mission was setup yet running the known working mission on the large scale airframes cause the issue to persist.
I’m currently running babyshark airframe with all custom wiring as well as setup, after asking them for advice they seem to think it’s because I am not using an air speed sensor. There’s definitely some merit to that but there’s got to be more to it.
I’ve attached the log file from the most recent flight where I saved the vtol before it could crash but if more data is required I can attach more log files as well as videos.
Thanks so much for all the help, really appreciate it.