Yesterday I flew my APM controlled quad for the first time in a couple of weeks. I lifted off in stabilise and shifted to alt hold at about 3 metres. After a second or so, without me asking it to the quad did a 360 degree barrel roll and fell a couple of metres, righted itself and seemed like it was trying to regain height but was unable to counter the falling speed and hit the ground, breaking one of the UC legs, bounced up and overturned.
I spent some time checking it out then thought I would try another flight. This time it lifted off OK but the controls were wrong, my pitch stick made it roll, so I quickly landed.
On MP I checked with the radio calibration screen, all controls appear to be doing what they should. I used the CLI to run tests of baro and compass and acc, all seem OK.
I have attached the log file. I was wondering if the log gives any insight into why the roll, did the APM think it received a command to do this please?
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Try this version, I added the .zip because the other forum wouldn't let me upload it as a .txt.
2014-03-14 19-27-39.log
Looks like a mechanical failure to me. Certainly the flight controller didn't request the roll and pitch numbers. I'd guess it's the back left motor or ESC that failed.
I can't seem to download and open those log files but it's most likely a mechanical failure of the ESC or motor on the side that it dropped on. It's very unlikely to be sensor related or something that the flight controller asked for because it has built in limits that it'll never ask for more than a 45 degree lean in roll or pitch.