Glossary
Static SpingDescribes a method of categorizing the stiffness of arrow shafts. Static spine is measured using a spine meter and determines the amount of deflection (bend) a shaft has when suspended between 2 points and then has an 880gram weight (approx 2 pound) hung from the center. The measurement is taken in thousandths of an inch. Some arrow shafts like ACE’s use this measurement to identify the shaft size e.g.: ACE 670 indicates that the arrow has a deflection of 670 thousandths of an inch. To standardize these measurements aluminium and carbon shafts are measured using a 29” shaft with the 2 points of contact 28” apart. For wood shafts the 2 contact points are 26” apart.
