I'm gonna be using a 3 blade on my new fw-190, I want it to look as good on the ground as it does in the air. My personal opinion is that if two blades were actually more efficient then you would see them on all modern propped aircraft. It depends on the use and application. The alpha 3 blade prop is purposely made to be a slow prop, its on a trainer. I got a 10x5 3 blade I'm gonna try on my Extra 300.