How To Determine Arrow Length. Matching an arrow to a bow arrow spine, arrow weight, and arrow length are all important factors in matching an arrow to a bow. The number of inches the arrow bends multiplied by 1,000 is the arrow’s spine.
Required arrow length` the proper length for your arrow will depend upon several factors: With your arms stretched straight out to your sides, measure from the tip of one middle finger to the tip of the other middle finger. Before we dive into this issue, we should briefly discuss how the draw length of a bow is measured.
The standard way to measure arrow length is from the back of the point to the throat of the nock.
You simple take your draw length and add 0.5″ up to a maximum 1″ to determine appropriate arrow length. You’re using a compound bow so you couldn’t have overdrawn. For example, if you have a 60 lb. For each draw length, record the draw weight on the fingers and the resulting arrow speed.