There are a few electric dedicated props out there, wood ones that is,, go to esprit models website, and do a search for XOAR props,, they even have three bladed wood props.
The percieved issue with thin bladed electric props,, my THEORY is that we can get away with thinner blades, and a thinner hub for that matter, because our power is input to the prop in a smoother fashion, unlike a two stroke that beats on the prop forward and backwards 9000 times a minute! On my electric P-40, I used one of the 12x6 E props, thin blades,, in certain conditions, like heavy air, that prop would howl whenever I pulled a square corner,, now mind you this airplane was a TANK so it was really working a load into the prop. When we went to one of our modified props,, It really eliminated a lot of the noise especially in the corners. As Pat said, one of the really big things we do is sharpen the leading and trailing edges. One of MY pet "tricks" is to taper the blade thickness substatially in addition to sharpening the blades edges. Like Paul Walkers new thin wing,this reduces the load on the motor. My electric conversion props are thinner than my glow props,,
Thanks to Pat, I am a total prop junkie,, we get together at every contest and show off our latest find of the "perfect" prop blank,, we have some beauties that have the prettiest wood you can imagine,, such is out passion,,, sigh