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Broadhead weight on carbon arrows?
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<blockquote data-quote="M1A1ABRAMS" data-source="post: 2815052" data-attributes="member: 123811"><p>The long bows & recurves do use a different type shaft. Easton states,</p><p> </p><p><strong>Why are there "weight codes" on top end Easton shafts? Is this important?</strong></p><p></p><p>With aluminum alloy, the specific stiffness- the stiffness for a given mass of material- is always exactly the same for a given alloy. The great thing about aluminum shafts is that you can get shafts to exactly match ones you had 20 years ago, and 20 years into the future.</p><p></p><p>It's generally not so with carbon fiber material, which has a significant stiffness variation in production run to production run, compared to aluminum. </p><p></p><p>In order to cope with this, Easton first specially selects every batch of the carbon fiber, and does a few proprietary things to eliminate as much of this variation as possible, and then they build shafts of the exact same spine (static stiffness). </p><p></p><p>Since there's always some minor variation in the carbon from batch to batch, some shafts of the exact same spine might still be a few grains lighter or heavier than others. </p><p></p><p>So, Easton goes to the trouble of exactly weight sorting the shafts, putting them in weight categories (C1, C2, etc) to ensure that not only do you have a perfect spine (which is the most important consideration) but that the shaft weights are uniform as well. </p><p></p><p>In addition, they further ensure every shaft in a factory-packaged dozen are within 0.5 grains. </p><p></p><p>Frankly, Easton overdoes this a little bit- they're a little bit obsessed with perfection. Normally there's so little difference between a batch of, for example, category C3 shafts and a batch of category C4 shafts, that once cut, assembled and fletched, they can be mixed with absolutely no issues. </p><p></p><p>But the shaft manufacturers that don't do this have a lot more spine variation in their production than Easton- sometimes as much as a whole shaft size!</p></blockquote><p></p>
[QUOTE="M1A1ABRAMS, post: 2815052, member: 123811"] The long bows & recurves do use a different type shaft. Easton states, [B]Why are there "weight codes" on top end Easton shafts? Is this important?[/B] With aluminum alloy, the specific stiffness- the stiffness for a given mass of material- is always exactly the same for a given alloy. The great thing about aluminum shafts is that you can get shafts to exactly match ones you had 20 years ago, and 20 years into the future. It's generally not so with carbon fiber material, which has a significant stiffness variation in production run to production run, compared to aluminum. In order to cope with this, Easton first specially selects every batch of the carbon fiber, and does a few proprietary things to eliminate as much of this variation as possible, and then they build shafts of the exact same spine (static stiffness). Since there's always some minor variation in the carbon from batch to batch, some shafts of the exact same spine might still be a few grains lighter or heavier than others. So, Easton goes to the trouble of exactly weight sorting the shafts, putting them in weight categories (C1, C2, etc) to ensure that not only do you have a perfect spine (which is the most important consideration) but that the shaft weights are uniform as well. In addition, they further ensure every shaft in a factory-packaged dozen are within 0.5 grains. Frankly, Easton overdoes this a little bit- they're a little bit obsessed with perfection. Normally there's so little difference between a batch of, for example, category C3 shafts and a batch of category C4 shafts, that once cut, assembled and fletched, they can be mixed with absolutely no issues. But the shaft manufacturers that don't do this have a lot more spine variation in their production than Easton- sometimes as much as a whole shaft size! [/QUOTE]
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