If it doesnt flex enough stiff spine then the arrow will have no forgiveness. Like the IBO speed rating arrow spine is a calibration based on a set of exacting assumptions.
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Carbon arrows are lighter and have a stiffer spine than aluminum or wood arrow shafts which helps with the flight correction of an arrow.
Spine of arrow. Common spine ratings are 300 400 500 and 600 with 300-spine arrows being the stiffest. How Is Arrow Spine Determined. For some carbon arrows I say some because companies like to come up with their own stiffness codes spine is expressed in the amount of deflection in thousands of an inch.
It measures how much an arrow will bend or flex. Arrow Total Weight grains 000. The lower the numbers the thicker the arrow while the higher the number the easier the shaft to bend.
Higher draw weights require stiffer arrows as do longer arrows shot by archers with long draw lengths. A heavy arrow will however dampen the oscillations quicker than a lighter arrow. Lets say you have a 50-pound compound bow.
All three factors affect arrow flexing. If the arrow is slightly stiff higher dynamic spine for what the bow needs then raise the brace height. Easton Aluminum Arrow Spine Chart ASTM Deflection to ATA Spine Shaft Size ASTM Deflection ATA Deflection ATA Spine pounds ASTM Deflection ATA Deflection ATA Spine pounds 1214 2501 2064 126 1575 1300 200 1413 2036 1681 155 1500 1238 210 1416 1684 1390 187 1450 1197 217 1512 1553 1282 203 1400 1156 225.
This arrow spine is measured in numbers. But it should only flex a certain amount. If the arrow is slightly weak lower dynamic spine for what the bow needs then lower the brace height.
The weight and length of your bow will also play into what type of arrow you use to shoot it. The figure is derived from suspending a 194-pound weight over a span of 28 inches of arrow shaft. In this video I describe what arrow spine is and why its important for selecting the right arrows.
Manufacturers recommend which spine should work best for various draw weights arrow lengths and point weights. If it flexes too much weak spine then its flight will be erratic. For example an arrow with spine number 400 is stiffer than a 600 spine arrow.
Calculations below are based on the arrow information entered below. Finally if the spine of the arrow is increased just sufficiently to counter the effects of the increase in weight the arrow upon release will behave in exactly the same manner as the lighter in weight and spine arrow that is it will deflect and contact the bow in the same manner. Modern arrows are typically made from carbon fiber.
I demonstrate how to check spine on a wood carbon and al. Every arrow should flex when it leaves the bow. Spine Defined Spine Refined The spine of an arrow is defined by how it reacts when pressure is applied.
Arrow spine in its simplest definition is the measurement of the arrows stiffness. The spine of an arrow not spline is a measurement of its stiffness.
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