what is foc

FOC stands for "front-of-center" and is a term used in archery to describe the percentage of an arrows total weight that is located in the front half of the arrow. The more weight that is located in the front half of the arrow, the more forward is the arrows center-of-balance. The F.O.C. balance position of the arrow is one of the more important elements affecting the shape of the arrows trajectory curve. Ideal F.O.C is especially critical for target shooters participating in long-range shooting competitions operating under the Olympic Style rules, such as FITA Archery events. While F.O.C is less relevant in some bowhunting situations (short-range shots), it can be critical in others (long-range shots, when shooting low-poundage bows and fixing trajectory issues at the range) . An arrow with high F.O.C. will fly with good stability, but will shed its trajectory quicker and nose-dive. An arrow with low F.O.C. will hold its trajectory.