I'm trying to access my flight logs after my first crash today. Aircraft was at ~15 ft AGL in Course Lock mode and I was proceeding downtrack. Went a short distance, then the aircraft did a few loops, aileron rolls, Lumshovics, and god knows what before it impacted the ground. Prop guards flew everywhere, but otherwise, aircraft seems to be intact and functional. However, what caused the crash? The right rear prop was not on the aircraft and not to be found, indicating to me that it perhaps flew off in flight. My two years of Google drone test pilot experience indicates this possibility and would be indicated by RR motor spin-up. The other viable option is that a gust of wind came and did a flight upset from which it could not recover. Can't tell without flight logs. I've followed the steps on the internet for this but I do not see the .dat files they allude. Need adult supervision on this one. Any help greatly appreciated.