Too many factors determine the way an arrow is going to react when shot out of the bow, and because of the nearly unlimited variables in determining dynamic spine, Easton hunting arrows are measured using static spine. Then there is dynamic spine, which describes the way an arrow reacts from the stored energy of a bow as it is shot.
The number of inches the arrow deflects or bends X 1000 due to the weight is the spine size or measurement of an arrow. The arrow must be 29” in length and supported by two points, which are 28” apart. There’s static spine, which is how an arrow reacts when an 880-gram (1.94 lbs.) weight is suspended from the center of the arrow. There are two kinds of spine (stick with us, we promise not to get too technical). For example, a 330 arrow is stiffer than a 500 spine arrow. The same Easton arrow comes in a variety of stiffness: the lower the number, the stiffer the arrow. The spine rating of an arrow is simply a measurement of its stiffness.
Here is what arrow spine means and how it affects the flight of your hunting arrow. Arrow spine is one of those terms that can seem technical on the surface, but can be easily explained. Bowhunting and archery terms can get technical. Your form, mental state and decision-making all factors into the equation of a perfect shot. On the other hand, it’s an art a human working with machines.
You are dealing with physics, aerodynamics and energy transfers. One of the cool things about archery are the processes around it.
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