Hi Oly, I am running a 13b in my long ez, ross redrive, and have used both 2 and 3 blade props, my preference was the Ivo magnum, but have gone back to 3 blade wood for CG. I reccomend the ground adjust Ivo if you have cg to spare. Also, I am looking to buy 2.13 gear set for Ross, any advice where to find? Thanks, Bob Mencl, N613NC