Hmmm, I purchased a 3 blade Biela (
http://www.aircraftinternational.com...5/Default.aspx) and over in the EVO radial thread there's another guy using a 3 blade prop (although it's the Xoar, not Beila) and he says it flies great for his taste anyhow. I think he has the 7-70 as well which is the smaller capacity Seidel/UMS version.
Hopefully mine works out OK, might buy a 24x10 2 bladed prop as well just in case.