Glossary

Dynamic Spine

Dynamic spine (also called Column Load) describes the amount an arrow bends when the string is first released and the bow’s stored energy is applied to the arrow. The amount the arrow bends is determined by a number of factors and can be varied using these factors. Factors that will affect dynamic spine are – shaft length, point weight, weight of shaft, weight of nock and weight of fletches. Weight added to the front of a shaft reduces the spine while weight added to the rear of the shaft increase spine. Shortening an arrow shaft increases stiffness and using longer shaft decreases stiffness. The heavier a shaft is in physical weight decreases the stiffness; a lighter shaft (physical weight) will increase stiffness.