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TAC 15/15i Basic Unpublished Information
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<blockquote data-quote="Konrad" data-source="post: 490833" data-attributes="member: 26549"><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">This ratio of arrow weight in grains per inch (gpi) to draw weight in pounds is somewhat confusing to me. I have been looking into the common ratios stated in the crossbow market and as Mr. 91 points out, those ratios are way down when compared to vertical bow ratios.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I can easily rationalize the static spines (the "standard" crossbow shaft diameter seems to hover around .375 inches) due to the much shorter over-all-length of the finished arrow lengths for crossbows in relation to those of vertical bows. My personal vertical bow ammunition is 29 inches from end of insert to throat of the nock.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I have real difficulty in understanding how these crossbows can handle the punishment of such light ammo??? I suppose that is a completely different topic for discussion.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">The range of weights you observed in the particular dozen shafts you weighed does not seem too terrible; however, when seeking the ultimate in accuracy, as with firearms, variations in time of flight (velocity deviation) translates into vertical stringing at the target. Physics dictates the slower the average velocity, the more pronounced the deviation becomes. The greater the distance to target, the more aggravated the condition becomes, as well. All of this discussion brings me to pointing out that very few long range marksmen use light for caliber projectiles. Sacrificing velocity for stability and retained energy with less shedding of velocity downrange (smaller trajectory and side wind effects) is no true gain.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">There are questions now out there and I am still awaiting replies.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Rob Smith at Barnett says Easton Technical manufactures the ammunition with Barnett's brand name. They are the C2 Power Bolt shafts. The C2 carbon composite is the least expensive of Easton's carbon product line. Barnett's top of the line compound Predator launches at 375 fps, has a 175 pound draw weight with an arrow of only 18 inches. This bow only has a power stroke of 15 inches verses the TAC's 17.25 inch stroke. </span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">You do the math.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">"I'm still collating…"</span></span></p></blockquote><p></p>
[QUOTE="Konrad, post: 490833, member: 26549"] [FONT=Times New Roman][SIZE=3]This ratio of arrow weight in grains per inch (gpi) to draw weight in pounds is somewhat confusing to me. I have been looking into the common ratios stated in the crossbow market and as Mr. 91 points out, those ratios are way down when compared to vertical bow ratios.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]I can easily rationalize the static spines (the “standard” crossbow shaft diameter seems to hover around .375 inches) due to the much shorter over-all-length of the finished arrow lengths for crossbows in relation to those of vertical bows. My personal vertical bow ammunition is 29 inches from end of insert to throat of the nock.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]I have real difficulty in understanding how these crossbows can handle the punishment of such light ammo??? I suppose that is a completely different topic for discussion.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]The range of weights you observed in the particular dozen shafts you weighed does not seem too terrible; however, when seeking the ultimate in accuracy, as with firearms, variations in time of flight (velocity deviation) translates into vertical stringing at the target. Physics dictates the slower the average velocity, the more pronounced the deviation becomes. The greater the distance to target, the more aggravated the condition becomes, as well. All of this discussion brings me to pointing out that very few long range marksmen use light for caliber projectiles. Sacrificing velocity for stability and retained energy with less shedding of velocity downrange (smaller trajectory and side wind effects) is no true gain.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]There are questions now out there and I am still awaiting replies.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]Rob Smith at Barnett says Easton Technical manufactures the ammunition with Barnett’s brand name. They are the C2 Power Bolt shafts. The C2 carbon composite is the least expensive of Easton’s carbon product line. Barnett’s top of the line compound Predator launches at 375 fps, has a 175 pound draw weight with an arrow of only 18 inches. This bow only has a power stroke of 15 inches verses the TAC’s 17.25 inch stroke. [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]You do the math.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]“I’m still collating…”[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [/QUOTE]
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