Really guys its unbelievably simple. Our models are TOTALLY dependant on a secure power supply. Without it they are DEAD, period. We CAN so easily gurantee that power supply by fitting TWO batteries, at minimal cost in cash and weight. A big hole plugged, dead easy and cheap in the big picture . Risk of battery failure is X, with TWO batteries its X squared , virtually eliminated . Why do you guys think that two of everything (sometimes three, but they still have just ONE main spar !) are fitted to things like ETOPS airliners, why does my boat have 2 batteries ? Why does my car (all modern cars) have THREE brake systems, my aeroplane (when I had it) 2 ignition systems ?

May I suggest you read the manuals of the Weatronics DRs and the Powerbox systems if my logic about power supplies is dismissed. The designers of these system are no fools, far from it.

Sorry, Ali, my big models do have TWO receivers ( Weatronic) and TWO power supplies. I CANT guarantee totally systems redundancy as even with twin servos on a single surface a burned out servo will make that surface immovable. Even my small models will soon have Weatronic Dual receivers (micros) on 2.4

However, there are situations where total redundancy IS possible and the critical situation of vital power supplies is just such. Not filling THAT gap is, in my opinion, just dumb !

Just my opinion, of course, but based on 40 years of R/c modelling (back to RCS Guidance systems and Flight Link Proportional) and 40 plus years of operating real jets, but what would Boeing etc. know ?

Funny thing is that I have bought hundreds of servos over the years, with perhaps two failures, I have a whole box full of batteries that have deteriorated to the point of being unuseable as main power supply. Go figure, as our American friends would say !

Regards,

David.

PS and yes large models DO place a larger demand on electrical supplies. Large digital servos moving large surfaces against higher dynamic loads equals greater current draw, elementary physics !!