80MM led fan glued to computer heatsink on Feigao

[BrianG]

No no, I think these people have the right idea. I think what would really work well is a fairly small 5000BTU room A/C unit blowing right across the motor and ESC. Of course, the A/C weighs about 30lbs, the DC to AC inverter a few lbs, and the extra batteries a several pounds also. Hmm, the extra weight might require an extra XL motor or two, and then more batteries/ESC, and maybe more A/C units to keep it cool. To get around the added battery and power inverter weight, you could just use about 500' of extension cord. While you're at it, mount a 100A/14.4v power supply to convert the AC into power the ESC can use.

So, figure around $10,000, but at least you saved a few dollars on the motor.