Hi, I've been wondering this for awhile and after an incident today while flying, I thought I'd ask.

I understand how a gas heli can auto because once the engine dies, the clutch will disengage and the rotorhead will be free to spin. What about on an electric? I have an MX400 and the motor is geared to the main shaft. When the motor quits, the rotor slows down VERY quickly because it is still engaged to the motor which provides a lot of resistance. Is it possible to auto an electric?

Incidentally, today while I was flying at about 10 feet up in the air, the motor suddenly quit. The heli dropped (I immediately increased collective for whatever good that did). Luckily there was no damage. I still don't know why the motor quit. On the ground I check all the connections, they were good. Then when I put the throttle at minimum, I heard the "churp-churp" of the ESC like it does when it initializes. Then took off and flew the remainder of the pack. Totally inexplicable power loss....