Comparing high power EDF Brushless

Lt to Rt: 64mm EDF 4800kv SAPAC, 70mm EDF 3200kv 2842 SAPAC, 64mm EDF 3800kv Freewing.

The freewing has longer stator and thinner plate (0.18mm?). Their magnet seems to come from the same source and strength. Interesting, the SAPAC has lots of cogging.

Dynamically balanced?

2842 - Inside as well?