In my new extra, I run 4 ubec's. Two are in redundancy on each receiver, so that if one fails, the other one takes over. This was custom done by kool flight systems and they had to add diodes, etc on each end to keep from back feeding.

end result? if one receiver goes bad I still have lots of redundancy. if one or even two packs goes bad I still have full power to both receivers... if one ubec goes bad I still have total power as well...

Rob

the pic shows the 4 ubecs at the top of the page