Unexplained spectacular crash on suveillance fixed wing UAV in Auto mode - 3km from starting point

Hi All,

While on a mission with our fixed wing UAV in a tropical country, flying a routine surveillance mission, the UAV started to roll with high amplitude movements, climb 10 m above its 150 m mission altitude, and fall.

We cannot figure out what caused the crash and would be very interested what you think of it.

Thank you in advance, we are very interested in your opinion.

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Theres much to little logging, not even altitude is logged.   I could see only ARSP, ATT,CTRL,IMU,PARAM(incomplete),and RCOU logs.

what I can only guess is a loss of attitude, (mission/WP/navigation/RC not logged) Pitch and roll loses control and simultaneously gets 17degree error  that I would guess is loss of control of one control surface  on a elevon/vtail or other mixed airframe.

I'm curious what firmware that was running? It certainly wasn't any version of ArduPilot I have been involved with.

It looks like it may have been based on ArduPilot at some stage, but the parameters are not like any ArduPilot release. Where did you get the firmware or the autopilot from?

Cheers, Tridge

 Andre thank you, indeed the UAV was only using an external logger, the PixHawk did not have an SD card inserted.
I can get a video of the telemetry replay which shows sudden rolls both directions when other mission planner flight parameters are good. Would you like me to post the video?

Andre K. said:

Theres much to little logging, not even altitude is logged.   I could see only ARSP, ATT,CTRL,IMU,PARAM(incomplete),and RCOU logs.

what I can only guess is a loss of attitude, (mission/WP/navigation/RC not logged) Pitch and roll loses control and simultaneously gets 17degree error  that I would guess is loss of control of one control surface  on a elevon/vtail or other mixed airframe.

it's up to you, I can't say anything about it's usefulness for this purpose until I see it :)

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