Finally got the radiator fans to render, but had to make them in three pieces.
The screens...
Notice the hole in the side of the hub for the power line.
The housing...
notice the slots for the tabs from the screen.
And the fan blades...
your choice of 5 or 12 blades for the radiator fans. The 10-bladed ones are larger, for the dynamic brake fan.
Thanks,
Mario