Rob Buckley wrote:And if you power both receivers from each of the two batteries (with a sprinkling of switches and diodes to taste), a single battery or switch failure won't put you in a partial failure mode you'll retain full control.
Rob Buckley wrote:John, that's interesting, what type of batteries were you using? To suck two 3.8Ah batteries from full to flat in under a minute would be drawing over 100A, which you'd expect to melt the cause of the problem or a cable (especially servo wire) somewhere before it could flatten the batteries.
I've gone over to using A123 batteries now, that can supply many an amp (I fly one model using the same batteries to power the motor and they can give a good 30A continuous with not much voltage drop) and they work well on receivers.
Bob, using an arrangement like I suggest depends on a rigorous check before every flight that everything is working properly, switching each battery on and off in sequence to check it. If you just turn it all on and fly, there could as you say be a hidden failure that puts you one step closer to a crash.
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