Good.

In my attempt, I tried to not use motion blur.
A first set of blades (A) is duplicated and the duplicate given a slight standard blur and grouped (B).
Then, another duplicate was made of the first set (A2)
On a 24 fps render, the  group B was spun at 25persec and the A2 spun at 14persec

I think I achieved that "car wheel" effect
Hope of interest

Brian

bwtr