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TAC 15/15i Basic Unpublished Information
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<blockquote data-quote="jon.henry755" data-source="post: 487086" data-attributes="member: 29115"><p>Your assessment of the reasons for the 85 gram point is "C". It was both of the reasons stated. </p><p></p><p>PSE sent the data they captured in their test labs on the force produced by the bow and asked Carbon Force to develop a shaft they could use on these xbows. The heavier the head you go to, the more flight anomalies become visible. </p><p></p><p>This would indicate as you stated that the spine compression being produced with anything over 100 grams is likely pushing the limits of what these arrows can handle. The engineers at PSE have recommended the 100 gram Steel Force, Phat Head Broadhead as one of the better performing heads they tested. I believe a lighter head in the 85 gram weight would probably provide better arrow flight if the head can be prevented from planing or steering improperly. </p><p></p><p>Carbon shafts seem to have a number of consistency problems that can vary from nonuniform consistency in shaft wall thicknesses to not being perfectly symetrical over the shafts length. Whilst I agree that the latest generation of carbon shafts are reported to have overcome some of these weaknesses, they are still not flying with consistent grouping capabilities. </p><p></p><p>Each shaft flies with unbelievable repeat precision and almost same hole accuracy at 60 yards. When shooting a group of shafts the performance of the groups opens up by as much as 5 or 6 inches. </p><p></p><p>In my experience, this is not a fletching attribute, it's typically a spine (Nock Indexing) or shaft deflection attribute. </p><p></p><p>Can you shed any additional light on this or do you have a different opinion on the likely cause?</p><p></p><p>Regards,</p><p></p><p>Jon</p></blockquote><p></p>
[QUOTE="jon.henry755, post: 487086, member: 29115"] Your assessment of the reasons for the 85 gram point is "C". It was both of the reasons stated. PSE sent the data they captured in their test labs on the force produced by the bow and asked Carbon Force to develop a shaft they could use on these xbows. The heavier the head you go to, the more flight anomalies become visible. This would indicate as you stated that the spine compression being produced with anything over 100 grams is likely pushing the limits of what these arrows can handle. The engineers at PSE have recommended the 100 gram Steel Force, Phat Head Broadhead as one of the better performing heads they tested. I believe a lighter head in the 85 gram weight would probably provide better arrow flight if the head can be prevented from planing or steering improperly. Carbon shafts seem to have a number of consistency problems that can vary from nonuniform consistency in shaft wall thicknesses to not being perfectly symetrical over the shafts length. Whilst I agree that the latest generation of carbon shafts are reported to have overcome some of these weaknesses, they are still not flying with consistent grouping capabilities. Each shaft flies with unbelievable repeat precision and almost same hole accuracy at 60 yards. When shooting a group of shafts the performance of the groups opens up by as much as 5 or 6 inches. In my experience, this is not a fletching attribute, it's typically a spine (Nock Indexing) or shaft deflection attribute. Can you shed any additional light on this or do you have a different opinion on the likely cause? Regards, Jon [/QUOTE]
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TAC 15/15i Basic Unpublished Information
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