As far as 2 blade props go I have seen people use the 16.5x12W, 17x12N and the 17x10 (full blade). My two blade of choice is the 17x10. I like it's speed and pulling ability. In the 4 blade area I like the 15x11 better than the 15.5x12. I find that the 15x11 gives me quicker acceleration out of snaps and better up line performance while maintaining that excellent 4 blade down line braking.

Jon Carter