Also I might add, when dealing w/ fixed blade BH, your launch angle has to be PERFECT to avoid planing.....I' m talking within 1/4 millimeter....I know several very good archers that TRY to make their BH impact different. They want to make sure they can have consistent, predictable planing. If you have a BH that is tuned PERFECTLY if you induce torque to the right, the BH will go that way. IF you induce torque to the left, it will go that way also....It basically falls into the same category as target shooters that try to get a tail high, left tear.....they want the arrow to have " direction" out of the bow. With wings on the front, this is even more important.