My question is this: is the Y6 actually supposed to compensate in cases of motor/prop/esc failure, or is this configuration really no more reliable than "normal" multicopter configurations?
I've been flying my Y6 regularly for nearly a year now. I've upgraded to the 2014 frame, upgraded to Pixhawk, upgraded to 4S batteries... it's been a great machine and I've been very impressed with it. And although other multicopters seemed lighter/faster/more-agile, I thought the Y6 was better because it was "safer".
Yesterday, mid-hover (in Loiter mode) the motors sounded wrong. It looked like the bottom motor on the tail slowed down, then nearly instantly the whole thing flipped upside down and drove itself into the ground. When I tested the motors afterward the back-bottom one didn't respond at all... it appears that it failed mid-flight.
It looks like the damage is limited to the GPS mast, a few stand-offs, several propellers, and at least one prop-adapter that was smashed into a rock during this upside-down dive. It could have been worse, but I truly believed that it was supposed to gracefully recover from a failure like this.
I chose to invest in the Y6 over other configurations with the understanding that the stacked motors/props provide redundant safety in the case of a motor/prop/esc failure. Is this really the case?