By the way, a quick look at your data shows a sudden, complete loss of data for about 5 seconds. When data returns, it shows voltage at 5.0 volts briefly, then returns to full voltage. One could speculate the battery lost connection in flight, and then reconnected on impact, but I would wait for a better analysis from some of the members that are better at data interpretation.
Taking a look at the telemetry data I never see a disconnection of the battery. I do see voltage drop at the initial climb to about 3 meters. There is some minor maneuvering of the aircraft at the 3 meter altitude and battery level is commensurate with the actions being performed. Then about a minute into the flight the throttle is lowered and the altitude is halved to about 1.5 meters then just a second later the throttle is again lowered and it appears the aircraft is flown into the ground and another voltage drop is experienced as the impact occurred.
I do not know if you use the neck strap that comes with the kit to hold the ST16S, but if so it is possible it caught on the throttle control and inadvertently caused the crash. What I DO NOT see is a failure of the battery to provide voltage to sustain flight
Many thanks for looking at the logs, Sorry for the delay in replying, we've been moving house.
I couldn't make any sense of the Flight Log Evaluation tool, so i started using QGround Control. casting my mind back this is what happened.
First flight:
When we got to a peak was at 05:16 i took a picture of the drone on the ground with my phone.(screenshot below with time stamp)
Flight 40 is the log from the ST16.
This is the flight as extracted from the drone, i don't know why but there is 1 hour mismatch between the two.
This was a successful flight, the footage capture is what i used to create the video posted above. I packed the drone up and headed further up the mountain, When we got a bit closer to the highest peak i stopped to capture some rolling mist.
Second Flight:
I believe this would be flight 41 from the log of the ST16
This is the log from the drone.
logs.px4.io
Its only a couple of minutes flight because as i started flying outwards i noticed i couldn't record any footage, the SD wasn't registering. It did that from time to time and meant id have to return it home and reboot the drone. i landed ok and rebooted. the third flight is where it all went wrong.
Third Flight:
The one where it fell out the sky.
Third flight would be flight 42 from the log of the ST16.
This is the log from the drone.
logs.px4.io
I remember launching upwards and flying outwards off the side of the mountain then it just dropped like a brick.