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TAC 15/15i Basic Unpublished Information
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<blockquote data-quote="Dorge" data-source="post: 496537" data-attributes="member: 32916"><p>That does not summaries it. The degree of each vane even on the same jig is already off due to the manufacturing process inaccuracy. Then the error/play of each part of the jig is where the error will compound to the accuracy of each vane, even on the same arrow, and it also can compound form arrow to arrow.</p><p></p><p>For simplicity I shall assume we use 3 vanes index which is most common, the four vane index had not been tested by me so I cannot be sure what the variation is.</p><p>1) 2 vanes are off or 2 degree together due to the inaccuracy of the index (4 degrees total), assume vane one is at zero.</p><p>2) the play (tolerance) of the jig to the body would be as high as 5-7 degree base on shaft size (assuming we are talking 0.300 ID shaft)</p><p>3) the nock play/rock (tolerance) of the arrow on the receiver, base on angle that it is resting on as it turns, will add another 5-7 degree to the inaccuracy. </p><p></p><p>Now you know why even with the same jig without some careful and know how to use the jig and chuck one can easily add 2+5+5 or 12 of maximum of 4 +7+7 degree off "EACH" vane. Not to mention the variation of each arrow to arrow, every segment of the error and happen to each arrow.</p><p></p><p>In most cases, the softer the vane, the less of an issue of vane accuracy due to what most common vanes do. Fluttering, delta vortex, 2nd and 3rd back end vortex issues. Not to mention sound/directional energy lost. Those are all contribution factors to how an archery projectile can impact the target accurately. When one use vane like Aerovane (which is airfoil base vanes) that little error becomes a very big deal as all errors are now amplified. At high speed, aerodynamic is KING which is also the reason why archery projectile if design right can be one of the few that can handle side wind! One only need to understand Giro and air drill concept to understand how those projectile can cheat wind and gravity via flying (circular lift). To learn more about Aerovane and why a perfect accurate vane setting is essential for Aerovane, you can visit <a href="http://www.firenock.com" target="_blank">Firenock: Home Page</a> aerovane section and Aerovane FAQ for more answers.</p><p></p><p>I hope this help you to understand more about how and why most archery projectile are not to shot into long range and how come it is so difficult until now to be able to repeat the long range shooting with confidence.</p></blockquote><p></p>
[QUOTE="Dorge, post: 496537, member: 32916"] That does not summaries it. The degree of each vane even on the same jig is already off due to the manufacturing process inaccuracy. Then the error/play of each part of the jig is where the error will compound to the accuracy of each vane, even on the same arrow, and it also can compound form arrow to arrow. For simplicity I shall assume we use 3 vanes index which is most common, the four vane index had not been tested by me so I cannot be sure what the variation is. 1) 2 vanes are off or 2 degree together due to the inaccuracy of the index (4 degrees total), assume vane one is at zero. 2) the play (tolerance) of the jig to the body would be as high as 5-7 degree base on shaft size (assuming we are talking 0.300 ID shaft) 3) the nock play/rock (tolerance) of the arrow on the receiver, base on angle that it is resting on as it turns, will add another 5-7 degree to the inaccuracy. Now you know why even with the same jig without some careful and know how to use the jig and chuck one can easily add 2+5+5 or 12 of maximum of 4 +7+7 degree off "EACH" vane. Not to mention the variation of each arrow to arrow, every segment of the error and happen to each arrow. In most cases, the softer the vane, the less of an issue of vane accuracy due to what most common vanes do. Fluttering, delta vortex, 2nd and 3rd back end vortex issues. Not to mention sound/directional energy lost. Those are all contribution factors to how an archery projectile can impact the target accurately. When one use vane like Aerovane (which is airfoil base vanes) that little error becomes a very big deal as all errors are now amplified. At high speed, aerodynamic is KING which is also the reason why archery projectile if design right can be one of the few that can handle side wind! One only need to understand Giro and air drill concept to understand how those projectile can cheat wind and gravity via flying (circular lift). To learn more about Aerovane and why a perfect accurate vane setting is essential for Aerovane, you can visit [url=http://www.firenock.com]Firenock: Home Page[/url] aerovane section and Aerovane FAQ for more answers. I hope this help you to understand more about how and why most archery projectile are not to shot into long range and how come it is so difficult until now to be able to repeat the long range shooting with confidence. [/QUOTE]
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