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Fletching Tac 15i arrows
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<blockquote data-quote="Twanger" data-source="post: 719206" data-attributes="member: 43393"><p>Just thinking about this some, it's hard to imagine that any significant spin would be imparted to the arrow before the fletching clears the rest. Consider a 2-degree offset. That's a lot! Only once the arrow leaves the string is it free to rotate. The Tac15 brace-height is, what, maybe 7.5 inches (I'd have to measure it). Say the fletchings are 2.5 inches, that's 3:1 ratio. So if the fletchings could instantaneously spin the arrow up to the fletching offset rate, that means you'd get 2*3=6 degrees of rotation by the time it gets to the whisker biscuit. BUT we know that the arrow has significant rotational inertial (mass) and cannot spin up instantaneously, so the actual rotation has to be less. Probably a lot less. It depends on the force (torque) the fletching can exert of course, but I'd be willing to bet a turkey dinner that the arrow doesn't rotate more than 35% of that potential 6 degrees (i.e. if was already spinning as fast as the fletching could spin it). So maybe 2-degrees of rotation by the time it hits the biscuit.</p><p></p><p>That's not very much.</p></blockquote><p></p>
[QUOTE="Twanger, post: 719206, member: 43393"] Just thinking about this some, it's hard to imagine that any significant spin would be imparted to the arrow before the fletching clears the rest. Consider a 2-degree offset. That's a lot! Only once the arrow leaves the string is it free to rotate. The Tac15 brace-height is, what, maybe 7.5 inches (I'd have to measure it). Say the fletchings are 2.5 inches, that's 3:1 ratio. So if the fletchings could instantaneously spin the arrow up to the fletching offset rate, that means you'd get 2*3=6 degrees of rotation by the time it gets to the whisker biscuit. BUT we know that the arrow has significant rotational inertial (mass) and cannot spin up instantaneously, so the actual rotation has to be less. Probably a lot less. It depends on the force (torque) the fletching can exert of course, but I'd be willing to bet a turkey dinner that the arrow doesn't rotate more than 35% of that potential 6 degrees (i.e. if was already spinning as fast as the fletching could spin it). So maybe 2-degrees of rotation by the time it hits the biscuit. That's not very much. [/QUOTE]
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