I' ve never noticed a difference in flight between the 4 blade or 3 blade, but there is a difference in how they are put together. With the three blades, the way the three blades interlock together, it basically creates a solid ferrule. With the four blade, that' s not the case. I' ve never done any type of test, so I don' t know if they perform any differently. I just feel better with the three blade.