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Thread: Accuracy Questions

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  1. #1
    String builder/ Super Moderator Hutch~n~Son Archery's Avatar
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    Default Accuracy Questions

    This was asked by a guy on another forum

    Questions:


    1. In the never ending quest for the ultimate in long range archery accuracy, all other things being equal, which is more critical, arrow straightness or uniformity of weight?

    It would seem to me that varying weights would produce vertical “stringing” on the target (related to time-of-flight/velocity variations) while shafts with straightness issues (say .006” total indicated run out) would produce more rounded groupings.

    2. On any given bow draw weight/draw length, will shafts of a slightly stiffer spine produce better groups than shafts of a slightly weaker spine or will the opposite be true?

    Of course, answers submitted will require apt justification for given opinions!

    and here is one of the answers

    Straighter Arrows Shoot Straighter, Right?

    From a pure physics standpoint, yes! Arrow straightness certainly does matter. Straighter arrows undeniably fly more accurately. In long-range laboratory conditions with a mechanical shooting machine, the straightest arrows with the best spine consistencies will always group best. But try to keep this issue in reasonable perspective. You are not a mechanical shooting machine. You don't shoot in laboratory conditions, and you probably don't shoot at extreme distances (100+ yards). The straightness difference in a ±.006" arrow and a ±.001" arrow is literally the width of a single human hair. So realistically, the ±.001" arrow probably has more to do with selling arrows than shooting arrows. The truth is, only a handful of the world's archers actually have enough shooting skill to differentiate between a very good ±.003" arrow and a "pro grade" ±.001" arrow. And within the typical bowhunting range, any difference would be practically imperceptible.




    What do you think?




    Hutch

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  2. #2
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    Very good points! In this age of marketing warfare people seem to really get hung up in the hype of specs. I admit that Im guilty as well. JMO but Id wadger to say that not to many of us will ever be able to shoot our equipment to its true potential.
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    Senior Member droppixel's Avatar
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  4. #4
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    On number 1, I dont think either of them matter too much. .006 or .001 arrows fly the same for me and the magority of us on this forum. As or weight, I would tend to think that would have more effect. However, the difference in weight between arrows would have to be a minumum of 10 grains of greater between arrows to make any real difference at the distances we shoot.

    Number 2, depends on the bow, Release of fingures. It also depends on if you really care about tuning. For example, shen I first started shooting archery I was getting groups of 1" at 30 and 40 yards with a GT 5575. When I got and shot my broadheads the where flying low and left, I didnt know anything about tuning at the time. After learning about tuning and trying to paper tune the arrows I found that I had to switch to a 340 or 300 spine arrow to get consistant flight with the broadheads. I could still shoot 1" groups the differance was the broadheads where following my field points much closer. So, no spine dont matter in compatition as much as in hunting.
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  5. #5
    Super Moderator bfisher's Avatar
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    Some pretty logical answers thus far and I tend to agree. There was a time when I could shoot well enough to tell the difference between .006 and .003, but not between .003" and .001". However, some of this difference might have been that the straighter arrows were of tighter tolerances all round, meaning weight and spine consistency. When I was on Gold Tip's staff they always sent me Pro series shafts
    (.001"). Shooting a shorter draw length I always checked them and ended up cutting 2" off the nock end and the remainder off the point end. This has proven many times to yield a straighter shaft and supposedly being .001" to start with straightness was never an issue.

    I did once have batch of Ultralite Entradas that spine consistancy just sucked. One arrow in particular I remember having spine deviation of .015". Just for s.... and giggles I tossed my 12 year old 3-28 ACC's in the spine tester and none varied more than .002". Maybe that's why they have always shot more consistently than AC arrows I've had. Therefore I'm going to vote spine consistency as the most important feature of an arrow.

    As for weight, how many people really know how little 10 grains is? If the difference is in the shaft weight then it is spread out over the length of the shaft so would have little effect on accuracy, IMO. Now if the difference is at one end, say at the point (field tips suck) then that could change foc so I agree this could cause vertical stringing at realy long distances, but nothing extreme till shooting past 60 yards or so.

    I once weighed a batch of Bohning 4" vanes. Most were about 8.8 grains, but there were quite a few that weighed over 12 grains and one that was over 15 grains. So much for quality control. Mix these up when fletching and see how it affects the total weight and more importantly the balance around the arrow.

    Now as far as being underspined or overspined? With maybe the exception of having large diameter shafts for indoors there should not be any over or under issues. That's what tuning is all about. Choosing a shaft that is close to proper spine and then tuning properly you should end up with as perfect a spine as humanly possible for the particular application. And I've said it so many times, "That's one of the most overlooked purposes of limb bolts on a bow".
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  6. #6
    Senior Member wscywabbit's Avatar
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    Wow, lots of good stuff in here! I gotta say that conversations like these are one of the reasons I love this site.

    For my 2 cents, I'd have to say that first and foremost, 99% of us can not shoot well enough to use modern equipment to its full potential. Period. I'm humble enough to admit that my bows shoot way better than I do, and I can't fault them for my inconsistancies and mistakes.

    That being said, you put any bow on a hooter shooter, in a contained environment, and start flinging arrows, it doesn't matter if the arrows are properly spined or if the bow is tuned, the same arrow will hit the same spot everytime. Now you start mixing arrows of different spines in a group, you'll get different results; those are variables we face in every batch of arrows. But that is also part of this question isn't it?

    I think that average backyard shooters and hunters the variances in a pack of arrows isn't going to matter much. Competition and long range shooters are going to have to be a bit pickier and do their own QC. Of the two, I think I could live with a little more leeway in weight than in spine; I'd rather have a vertical variance when shooting at an animal than horizontal any day. But then that's obviously because I hunt!
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