![]() ![]() They impart more stress to the arrow during a shot cycle so the arrow has to be stiff enough resist too much paradoxing (flexing in flight).Slower bows require a weaker shaft. Increase or decrease your bow’s draw weight – Fast bows demand a stiffer arrow shaft.The key is knowing what spine you need… and that is why archery software is a powerful tool. You can do the opposite too you can choose to shoot a longer arrow to get a weaker spine. If you want to adjust your arrow’s spine, you can shorten your arrow. Now try flexing a pencil that’s 3 inches long. How easily can you flex a brand new long pencil? Yeah, it’s pretty easy. Arrow length – Increasing an arrow’s length will weaken the arrow’s dynamic spine while shortening an arrow will stiffen the dynamic spine. Think of a pencil.Nock weight or rear weight – Adding weight to the rear of the arrow will increase or stiffen the arrow’s dynamic spine while removing weight from the rear of the arrow will decrease or weaken the arrow’s dynamic spine.The lighter tip weight (ping pong ball) allowed the antenna to maintain a stiff spine. Now picture pushing a ping pong ball with the antenna. The heavy tip weight (bowling ball) made the spine or flexibility of the antenna very weak. The first object you’re going to push is a bowling ball. Decreased tip weight will stiffen dynamic arrow spine.To understand this, picture holding a car antenna and pushing two different objects. Tip weight – Increased tip weight will weaken an arrow’s dynamic spine.Here is an example of some factors that affect dynamic spine: We can tweak these factors until the recovery rate of the arrow is optimal in flight. By adjusting the weight of arrow components or the length of an arrow, we can adjust the arrow’s dynamic spine. ![]() Many different factors affect the dynamic spine of the arrow. Dynamic arrow spineĭynamic arrow spine is the spine of the arrow during the shot. The amount the arrow bends or deflects in thousandths of an inch is your spine measurement of your wooden arrow. To measure the spine of a wooden arrow, set the arrow on two supports 26 inches apart and hand a 2 lb weight from its center. An archery arrow program will have the real spine value in it’s database so whether the manufacturer’s number on the shaft isn’t really too important. Some manufacturers make up their own numbering system. For example, a Black Eagle Carnivore 300 has an arrow spine of….? Yeah. This is done by including the spine measurement right in the arrow name. ![]() Some manufacturers relay this spine measurement straight to the product. If a weaker arrow deflects or sags 1/2 of an inch, it’s spine will be 0.500″ or. ![]() If an arrow sags 1/4 of an inch, it’s spine will be 0.250″ or. The amount the arrow bends or deflects in thousandths of an inch is your spine measurement. To measure the spine of today’s modern compound bow arrows, you’ll need to set the arrow on two supports that are 28 inches apart and suspend a 1.94 lb weight from its center. Measuring static spine of aluminum and carbon arrows There are actually two standard methods use one for wooden arrows and one for all other arrows. Static spine is measure by supporting an arrow on both ends, hanging a weight from the center, and measuring the deflection in thousandths of an inch. Static spine is solely measured on the arrow shaft. When static spine is measured, arrow components such as field points, broadheads, fletchings, and nocks do not come into play. Static arrow spine is the spine of the arrow in the static, or stationary, state. There are two types of arrow spines that we will talk about: static spine and dynamic spine. ![]()
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