How To Determine Arrow Length. To get your draw length, divide your wingspan by 2.5 wingspan / 2.5 = draw length The longer the arrow shaft, the more it will flex.
For each draw length, record the draw weight on the fingers and the resulting arrow speed. I prefer determining proper draw length with this method because the flat wall aids the person in standing upright and is much easier to see, then correct, scrunched shoulders or an expanded chest. The number of inches the arrow bends multiplied by 1,000 is the arrow’s spine.
The draw length of the bow, the type of bow you have, and the position of your arrow rest.
Matching an arrow to a bow arrow spine, arrow weight, and arrow length are all important factors in matching an arrow to a bow. A peak weight is the maximum amount of weight that you can pull when drawing your bow. To calculate this, arrows must be 29” long and supported at two points 28” apart. Your draw length and arrow spine will influence your arrow length.