What is arrow spine and why does it matter?

• A. Arrow weight.
• B. Arrow spine is the stiffness of the arrow shaft; matching spine to bow weight ensures stable flight.
• C. Arrow length.
• D. Fletching material.

Answer: (B)

Arrow spine is the stiffness of the arrow shaft, essentially how much the shaft flexes when the bow is released. This matters because the bow transfers energy to the arrow, and the shaft must bend in a controlled way to store that energy and release it smoothly. If the spine is too weak for the bow’s draw weight, the arrow flexes too much, leading to inconsistent flight and wide groupings. If the spine is too stiff, the arrow doesn’t bend enough, which also disrupts accuracy. Matching the arrow’s spine to the bow weight ensures stable, repeatable flight and tight groupings. Other factors like arrow weight, length, or fletching influence performance in different ways, but the essential idea is the stiffness of the shaft and how it pairs with the bow.