icecube57 wrote:Would scoops like this help force air into the hub.
No. Jeremy did a calculation in the other thread. Forced air like Arlo1 did with fans on the stator spokes to suck air in from the outside on one side, or a centrifugal fan approach are really the only options. That is unless you have a drum brake on one side whose stationary cover could be used to mount a powerful ducted fan to blast air into the motor, but I'm the only one around here using motors where that is viable. The last option is modding the one side cover to take a bearing with a much larger ID, and using the extra area between the axle and the bearing to force more air through. Someone did that with good success though I've lost the link to that video.
The moral of the story is trading an X5 for a 9C was a big step down in power. Sure your 5303 was hard to drive, but no way a 12fet was going to do it, and 18fets cuts it thin on the hard to drive motors. What you needed was the big 24fet like I'm using to drive my even harder to drive hubbies without issue.
You're a big guy like me, and we need manly motors or higher speed motors with a gear reduction to make them manly. Do you want me to tell you how I plan to dependably run my lowly 9C at 4kw continuous and 7-9kw peaks?