It also has a lot to do with the pitch of the blades and the number of blades.
BTW. I am in search of a JetFan 90 if anyone has one they like to part with.
Originally Posted by heychas
I noticed on the EJF website they recommend their 1680kv motor with their fan for 8s. Similarly, the Arc 36-75-1 is 1680kv and it gets between 2.5 to 2.75w on 8s with both the wemo and 9305 fans. Perhaps as KL said, the 1500kv is only good for Jetfan.