What is arrow spine?
There are two different types of spine – STATIC spine and DYNAMIC spine. STATIC spine is measured by the amount of flex in the arrow when an 880-gram (1.94 lbs.) weight is suspended from the center of the arrow. The arrow must be 29″ in length and supported by two points, which are 28″ apart. The number of inches the arrow deflects or bends due to the weight, is the spine size or measurement of an arrow. DYNAMIC spine describes the way an arrow reacts from the stored energy of a bow as it is shot. Several factors determine the way an arrow is going to react when shot out of the bow, including method of release (fingers or mechanical release), amount of energy applied by the bow, the bow’s cam system (single, round wheel, hard or soft), weight of the arrow, spine of the arrow, length of the arrow, point weight, nock weight and fletching weight. Even nock set material (traditional brass nock or serving nock), along with string and serving material can influence dynamic spine. Because of
