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A few observations:
Some of the auxiliary fan blades have tiny balancers attached to some of the blades to balance it out. I'd guess the main engine fan won't have these.
Both the auxiliary fan blades and the main engine fan blades are unevenly spaced out. Some of the main engine fans are evenly spaced out, or grouped together (the original 6-bladed OM617 engine fan is like this), while the updated 9-bladed plastic fan for the same engine is not spaced out evenly unlike its 6-bladed metal version.
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