[suicideneil]

Oh crikey, thats not quite what I had hoped for.

Along the lines of your previous suggestion then, what about using some kind of component that was only rated for 8v say, that would blow if the BEC failed and tried to send full pack voltage to the Rx and servos? Same idea as a normal fuse, but one that was voltage sensitive rather than current senitive. Or am I just being dense again?...