CP, since when are the tips the only part of the wing that gets loaded? You'd need to apply the weight in a more even manner to get something realistic.

E-props are supposedly designed to take advantage of the greater torque of an electric motor. I guess they're thinner at the hub because of the lack of a "power pulse". The 4.2x4 is a nitro blade fer sure. APC markets them as 1/2a props and they have a thicker blade at the hub. What all this means in the long run is beyond me, just reporting observations!