Thanks for your reply. Just to make sure that i understood correctly. you meant to say i can use one 3S battery/fan-motor? What if i go with 4S per setup, will i still be ok?
On the other hand do you think that following ESC is of good quality to use on my application? :
TURNIGY TRUST 70A SBEC Brushless Speed Controller
Thanks again for your help
If you use the 2800kv motors, run them on 4S. If you use one 4S LiPo, it should be at least 5000mAh/40C to power BOTH motors/you could use two 4S3300mAh/40C to power each motor separately, or wire them in parallel (4S6600mAh) to power both motors.
If you use the 2100kv motors, run them on 6S......you could use two 3S4000mAh/40C wired in series to make a 6S4000mAh supply.
I use Exceed-RC 80Amp OPTO ESC's, 4S5000/30-40C, 3100kv E-Flite inrunners (Delta V-15's) in my Windrider 737. Way more than enough power. I know its a bit smaller than yours.