HI!
Looks great, man, that's a lot of holes!!
If the fan is being run it the same orientation as in the pic, the fan spinning correctly will move air downwards lifting up the robot. If you want to reverse the flow, reversing the direction of the motor will give you only limited success. What I found was that lifting off the fan part, turning it upside down, (trimming down the domed section) and pushing it back on, is the best way to get the flow in the right direction. Or you could just turn the assembly upside down.
The original Fantom fan the edf unit upside down, but since then, I have removed the fan, trimmed it, and re installed it the other way up. It might explain why the airflow is in the right direction, but not as efficient as you would expect?
Hope that makes sense, Jim.
It's been a long day...
