The radius is just something specified in the definition of the NACA 65A009, it's not like I personally have something to do with it. The radius will get larger with a larger chord blade. However, the chord has to be a certain dimension for performance reasons. In real life you could have a straight line there I suppose. But the purpose of this model would be for FEA to do a fatigue analysis at the trailing edge radius. So that little point at the base of the hub is an important area for analysis. The idea is to try and model it as it actually would be. Small radius are nothing new to aerospace. It can easily be done with a CNC machine. I don't know what dimensions are in there right now as its been scaled around a lot. But the point files are the real dimensions in meters. Whatever that radius comes out to be, is what is needed. Does that make it any clearer?