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TAC 15/15i Basic Unpublished Information
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<blockquote data-quote="jon.henry755" data-source="post: 488599" data-attributes="member: 29115"><p>Hi Konrad,</p><p>Without getting into to much detail it's necessary to test carbon spines with the fletching, nocks and inserts removed. The best testing should be done with new raw shafts for the most accurate results. </p><p></p><p>I'm not sure if that's ever been done, since until the last couple of weeks PSE has only ever sold finished arrows.</p><p></p><p>In the next couple of weeks we are hoping to receive a couple dozen raw shafts that we can begin testing from scratch. </p><p></p><p>The testing on the current arrows which is still very valid needs to be with all components removed and all that' necessary is to test for the stiff side of the spine. Once this has been done, one can easily determine on each numbered shaft if the nock and vanes had previously been applied consistent with the location of the stiff part of the spine. </p><p></p><p>If not, issues identified and spine problems proven. The fix then becomes obvious. </p><p></p><p>No question we should then be challenging everything else about these arrows, such as the nocks fit to the arrow shaft and all of the other points that have been made in this thread. At that pint we have a major manufacturing problem that the maker will need to resolve before most people will touch their products. </p><p></p><p>To match proper deflection you need 28" of testable arrow shaft, but truthfully there aren't any deflection charts for these arrows because of the length of shafts and the pull weight of the xbow. Nobody has ever produced a spine deflection chart that goes up that high, so we're in no-mans land with that data. </p><p></p><p>Your weight ratio calculation seems correct to me, but please keep in mind that unless the static spine testing is done with all components removed the readings are not very useful. </p><p></p><p>If you drop below 9 grams per inch of arrow weight, it will void most manufactures limb warranties on regular compound bows. We've seen some of the IBO competitors do this, but there's always a risk and trade off when it's done. I can't speak to the weight ratio on these arrows until I have more specific readings from the spine testers. It seems unlikely that PSE would have invested the time and money to have their own arrow making division produce shafts that were that far out of spec. for their crossbows, but stranger things have happen?</p><p></p><p>Regards,</p><p></p><p>XBOW755</p></blockquote><p></p>
[QUOTE="jon.henry755, post: 488599, member: 29115"] Hi Konrad, Without getting into to much detail it's necessary to test carbon spines with the fletching, nocks and inserts removed. The best testing should be done with new raw shafts for the most accurate results. I'm not sure if that's ever been done, since until the last couple of weeks PSE has only ever sold finished arrows. In the next couple of weeks we are hoping to receive a couple dozen raw shafts that we can begin testing from scratch. The testing on the current arrows which is still very valid needs to be with all components removed and all that' necessary is to test for the stiff side of the spine. Once this has been done, one can easily determine on each numbered shaft if the nock and vanes had previously been applied consistent with the location of the stiff part of the spine. If not, issues identified and spine problems proven. The fix then becomes obvious. No question we should then be challenging everything else about these arrows, such as the nocks fit to the arrow shaft and all of the other points that have been made in this thread. At that pint we have a major manufacturing problem that the maker will need to resolve before most people will touch their products. To match proper deflection you need 28" of testable arrow shaft, but truthfully there aren't any deflection charts for these arrows because of the length of shafts and the pull weight of the xbow. Nobody has ever produced a spine deflection chart that goes up that high, so we're in no-mans land with that data. Your weight ratio calculation seems correct to me, but please keep in mind that unless the static spine testing is done with all components removed the readings are not very useful. If you drop below 9 grams per inch of arrow weight, it will void most manufactures limb warranties on regular compound bows. We've seen some of the IBO competitors do this, but there's always a risk and trade off when it's done. I can't speak to the weight ratio on these arrows until I have more specific readings from the spine testers. It seems unlikely that PSE would have invested the time and money to have their own arrow making division produce shafts that were that far out of spec. for their crossbows, but stranger things have happen? Regards, XBOW755 [/QUOTE]
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