5s or 10s A123 setup for boat?

[zeropointbug]

For lowering cell stress, yes, HV will reduce it a small amount, not much.

The system as a whole will be more reliable however (usually), because of less resistive heat losses; wires, esc, motor...

[gimpygolden]

So since I've got one of these kicking around
http://www3.towerhobbies.com/cgi-bin...&I=LXHYK6&P=ML
do you think it will cut it for the 10s setup if I add watercooling or just not enough?

[zeropointbug]

Hmm, that would be pushing the limits of that ESC pretty hard. I don't really know how Kontronik rates their controllers vs. realworld, but I would say a ~80amp continuous controller is what you need. But you never know, you could just try this one out for a while, go easy on it, check the temps and keep pushing it until you are satisfied. Water cooling system just might do it though.

[gimpygolden]

I have one sitting in an e-Raptor converted heli that I'm not using.
I think I'll try it out on a small prop & watch the temps.

[zeropointbug]

yah, do that, cuz with water cooling, you tend to need a less rated current capacity compared to surface vehicles. Try it, and report back with temps, and the go from there.