I run a 15-8 3-blade Gruapner on mine with a 26cc gasser. The 3-blade MA's don't work very well at all just to flexable and flaten out. The APC's are the best for speed but mine is fast as it is so not really a issue plus it looks nice both running and static. The Gruapner's are the best that I can tell good thrust and speed. Just my experiance. If you have a motor that produces a lot of power then the 3-blade won't hurt you but if you need speed go with the APC.