yellowboy63 wrote:Killing the transmitter in flight would not help (you would get the same end result) drone drifting off slowly as it descends. I think the problem is in the sketch, as the drone lands or fail safe kicks in we lose complete control off the drone this is not the case in the apps. If you could have control when landing or in fail safe mode that would help a lot.
Yellowboy you were right. I just tried a risky experiment and took the drone for a night flight.
When I've had this problem in the past the drone is usually too high, or far away for me to see the motor led's. So I went to the centre of a local playing field and started flying at around 20ft. After 4 to 5 minutes the four led's started to flash green, and the drone descended. It seemed to hesitate as it passed through the ultrasound range threshold, but then settled down and landed. I just flicked the "land" switch back into the "land" position, and then back to "take off" and the drone took off again with no problem.
I then tried taking the drone to about 50ft, and after just a couple of minutes the led's started flashing green again and motor noise dropped as the drone started to descend. Almost immediately the motor pitch increased and the drone climbed again. Because the park was so quiet I could clearly hear the motor pitch raising and falling on this weird 3.5 second cycle, an see the drone bobbing up and down at around 50ft, drifting in the breeze.
I tried flicking the "land" switch to "land", and I tried switching the TX power off, in an attempt to force a "fail safe" landing. Neither of these had any effect but all the time the led's were still flashing green. By this time I was drifting toward some houses so I was forced to hit the emergency switch, which worked and cut the motors. I was very lucky again, the drone fell flat, and auto rotated to a hard landing with no damage.