@x-y: thanks!
@BrianG: No prob! The currents are probably less peaky but compared to ground RC they will sustain higher current for longer, it's all down to the thrust velocity vs. the actual velocity of the fan. The Novak 6.5 in the 3.5" fan pulled 93A peak (Turnigy wattmeter) and runtimes for a similarly set-up car with a normal powertrain would be longer...Novak rates the 6.5 for 730W, which means around 60A input current assuming 85% efficiency. The T600's pulled ~83A each in EDF-Revo on 8s, not sure what it will be like on 6s. Assuming amps scale linearly in fans, it's about 60A which is just over the 20C continuous rating of my 6s battery.
Having to run the fan at high power a lot of the time pulls a lot of current though, I am fairly certain I got runtimes around what a jet/heli will expect (ten minutes tops). Despite being an amp hog, it's actually really fun to drive, even though it handles badly due to 25/75 weight distribution
I have to fix Fancar v2.1 as I've borrowed its ESC and some other things for testing, next time I take it out I will make sure to shoot some video and post up the Phoenix log.