Big STOL-style scratch build plane part 8 (unprepared runway, landing gear woes, endurance test)

I forgot to mention in the video, but that last flight with two batteries in parallel was exactly 30 minutes finishing at 14.5V under load, and all cells returned to 3.8V at rest shortly after. Dataflash log shows the current typically between 20 and 25 amps at half-throttle cruise, take-off bursts were around 90 amps.