I have a Tarot X6 hexacopter with a pixhawk 4 FC with arducopter 3.6.4. After taking off in position hold mode I couldnt get it down. Pulled down the throttle stick very low(almost the whole way down) but the drone didnt start to descend. When I looked at the log files the ch3in channel decreases to around 1100(minimum is 1060) but the ch3 percent remain at 50-60%. Isnt Ch3 percent suposed to go down as well.
Since it didnt come down, I switched to RTL mode. The drone was supposed to climb upto the RTL_ALT which is 15m, but it only climbed upto 10m. I had set the RTL_FINAL altitude to 0 for it to land but it kept hovering. At this point the throttle stick was still almost down. Then I switched to Stabilise mode (forgot to push the throttle stick up) and the drone crashed. Any reasons as to why this happened. I have attached both the log files.