Chris_P, I uploaded your flight log
here.
According to your flight log, it appears the following occurred:
- Your RTH altitude was set to 30 meters.
- At 16m 9.4s, your Phantom started returning home due to low power (this occurs when the "Smart Return-to-Home" feature is enabled in DJI GO).
- The home point at that time was the original home point since the home point was never reset after takeoff.
- Your Phantom climbed to 65 feet (above the takeoff point) before it started returning to the home point (the takeoff point).
- During the ascent to 65 feet, you hit the throttle stick a few times.
- Your Phantom crashed at 55 feet above the home point.
The Phantom manual notes the following in the RTH section:
"If you move the throttle stick after the aircraft rises above 65 feet (20m) but below the pre-set Failsafe RTH altitude, the aircraft will stop ascending and immediately return to the Home Point."
You hit the throttle stick about one second after your Phantom reached an altitude of 65 feet, but it appears your Phantom stopped ascending and started returning home as soon as it hit 65 feet. If the log is correct, I cannot explain why that happened. It should have continued to ascend until you hit the throttle stick one second later.
If you ignore that unexplainable event, your Phantom still would have been at an altitude of about 67 feet
(assuming the same rate of climb) when you hit the throttle stick if it had continued to climb. That means it would have then started returning home at 67 feet and I'm assuming it would have crashed at that altitude as well. So, either way, your Phantom was doomed since you did not cancel RTH prior to the time your Phantom reached the point of impact.
FYI, when using the Smart Return-to-Home feature, DJI GO does display a prompt to allow you to cancel the auto RTH. If you don't see that prompt and/or do not cancel the RTH from that prompt within 10 seconds, your Phantom will start returning home. At that point, you can press the RTH button on your remote controller to cancel RTH.