Today I was doing a manual flight using my DX8 radio for the 3DR Y6. I was trying to get some video while flying a remote area over a near by river. At about 6 1/2 minutes into the flight and with a reported 50% remaining in my readymaderc 8000mah battery. The Y6 seemed to switch into a fail safe or unknown mode where it wanted to land while in motion and would not take commands from the remote. When this occurred, I was flying in loiter mode at 15mph with a 1.2ghz video transmitter and I witnessed the whole event live. I tried to override the thrust by going to stability mode and it still would not increase thrust or follow the movement commands I was giving it. I was very lucky today because the Y6 missed the water completely and didn't even break a blade. Here is a link to the video of the whole flight. https://vimeo.com/84828838 At about 6:33 "end of video" you will notice the copter starts the oscillate more than the camera gimbal and take out and the motors sound erratic. Now I still have to adjust the PID's which I'm in the process of doing. Here is what is strange is this doesn't seem to occur when on a autopiloted mission or when in stability mode. I've flown it in stability mode over 55mph ground speed. The only time I've seen it happen is at low attitude under 150ft and under or around 15mph. Is there some sort of adjustment or PID change I need to make to correct this issue? Am I just losing radio signal and the Y6 is doing some sort of auto land fail safe?
3DR telemetry with Mission Planner 1.2.92 ground station active during flight
1.2ghz video transmitter on for FPV viewing
Crashes have occurred from 281 to 558 yards away through forested areas while in moving loiter mode.
This was going to be a great flight until the obvious happened. I'm just thankful it landed out of the water.