I flew seaplane type UAV last month and unfortunately crashed due to RC signal lost during the flight.
Here is the flight log. (Latter part of log after crash is trimmed)
When it loses RC signal, failsafe was activated, which was supposed to let aircraft go back to home point. However, it rather simply pitch down and dived into trees.
Here is pitch angle in the log.
Does anybody know what would lead this behavior?
Airspeed sensor was not working correctly in this flight, maybe because water went inside the pitot tube when cruising on water. And I suppose 0[m/s] reading in airspeed caused pitching down to gain speed and ended up with this behavior… What do you guys think?