Some thing still not quite right here:
for starters, all the tips have different velocity profiles and the top blade has different results to the other two. My cad is now rotating around the y axis going through the origin (as defined in my MRF setup) however it still looks like the issue has something to do with this.
I’m a little stuck with this so open to any suggestions. I resolved my old geometry to ensure that that works as expected, which it does so it doesn’t appear to be SimScale side.