I finally got a simple bungee made from surgical tube, its perfect for launching the MJ! No more dork launches!!! I ran the Flight Power 20Cs and it held up well on full throttle most of the times. The battery was about definately under 70C after a whole 8+ mins flight on WOT most of the times. I will have a picture of the bungee set up attached soon, was cheaper to make than puchasing from the LHS. Also, surgical tube seems to give a more gentle launch, more 'linear'.