Do you think I'm over spined.

Home Forums General Archery Discussion Do you think I'm over spined.

This topic contains 9 replies, has 4 contributors, and was last updated by warren-p warren p 1 year ago.

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  • December 9, 2013 at 7:35 pm #610217 Back to Top REPORT
    warren-p
    warren p

    Joined: 9/18/2012
    Location: Oregon
    Beman ics 340 at 253/4 inch 61# 125 grain tip out of a XLR8?
    December 9, 2013 at 8:52 pm #610238 Back to Top REPORT
    blackdog
    BlackDog

    Age: 63
    Joined: 7/21/2004
    Didn’t have all the info. Didn’t have exact insert weight, fletching, nock, draw length of bow etc
    Should be fairly close. This help any? Fill in the blanks and I’ll run it again.

    Screen Shot 2013-12-09 at 9.44.42 PM

    December 9, 2013 at 9:11 pm #610250 Back to Top REPORT
    warren-p
    warren p

    Joined: 9/18/2012
    Location: Oregon
    Easton super nock 3 blazer vanes do not know the weight of my insert it’s the one that come’s with the arrows draw is 261/2 inches. Wow arrow weight was almost dead on 417 is the average. thank you. So it look’s like my spine is fine thank’s for the help I thought I might be way overspined.
    December 9, 2013 at 9:34 pm #610260 Back to Top REPORT
    warren-p
    warren p

    Joined: 9/18/2012
    Location: Oregon
    Sorry I misread it I am overspined then I should probably be using a 400 hundred spine then?
    December 9, 2013 at 11:35 pm #610278 Back to Top REPORT
    chillr-killr
    ChillR KillR

    Age: 34
    Joined: 11/21/2013
    Location: IL
    I like using the Carbon Express chart for adjusted draw weight.  It may not be quite as thorough as the computer programs, but is is much better than the other arrow selection “charts” I’ve seen.  Assuming you shoot a release, I have your adjusted dw around 72#.  With your arrow length, the .340 is probably a little stiff.  That may not be bad though.  How is your broadhead flight?  A shaft that’s a bit stiff seems to broadhead tune better for me than when they’re too weak.
    People Eating Tasty Animals
    December 10, 2013 at 7:38 am #610285 Back to Top REPORT
    gjarcher
    gjarcher

    Age: 71
    Joined: 10/3/2006
    Location: Colorado
    View My Bows
    You are a bit over spined. Optimal spine for your current setup is about .360″~.370″. If you want to experiment and fine tune the arrow spine , try some heavier field points to see if the group size improves.
    http://www.3riversarchery.com/Screw-In+Field+Point+Test+Kit+5%2F16_iCF5-T_baseitem.html
    Untitled-1

    Your setup is on the borderline between .400 spine and .340 spine. At 25.75″ finished length, the .400 spine shafts would be weak, even with 100-gr points, and the .340 are stiff.

    A 27.5″ Beman ICS 340 shaft with 125-gr points would be correctly spined for your bow setup and only result in 3 fps slower arrow speed. In the future, cutting shafts no shorter than 27″ would be preferable for the bit of forgiveness gained versus the few fps speed lost.

    However, a stiff shaft isn’t that critical to accuracy IF shooting form is consistent and bow is tuned for level nock travel. Top Pros often shoot overly stiff, fat shafts for a scoring advantage, and trust to consistent shot execution. As mentioned, because a stiff shaft bends less than a weak one, broadhead aerodynamics have less influence on them, hence tune easier and because they flex less on impact they penetrate better than a weak shaft.

    … hope this helps.{#emotions_dlg.mathews_peace}

    December 11, 2013 at 7:04 pm #610474 Back to Top REPORT
    warren-p
    warren p

    Joined: 9/18/2012
    Location: Oregon
    Well I shot through paper it is showing that they are 2 stiff I can adjust it out. But first I wanted to see if I could get my Muzzy’s and field tip’s to shoot together a few tweak’s to the rest and there both dead on at 30 yard’s. That work’s for me right now later I will have my arrow’s cut 2 271/2 I was worried seeing how I have almost 3 dozen cut to 253/4. I want to thank everyone for the input and help.
    December 11, 2013 at 8:10 pm #610497 Back to Top REPORT
    warren-p
    warren p

    Joined: 9/18/2012
    Location: Oregon
    One thing guy’s 1 of you got my arrow speed at 254 and the other 1 at 263.87? I shot it through 2 different conagraph’s  at 2 different shop’s and at one it averaged 279 and at the 0ther shop 2fps faster. That line’s up with the online speed calculater’s that I tried online they said 282?
    December 12, 2013 at 4:11 am #610519 Back to Top REPORT
    gjarcher
    gjarcher

    Age: 71
    Joined: 10/3/2006
    Location: Colorado
    View My Bows
    The 254 fps was with a 175 grain point … which would be a 467 grain arrow.

    But, you are correct … OT2 is about 10 fps too slow for your setup.

    IBO 360
    deduct 16 fps for DW = 344
    deduct 35 fps for DL = 309
    deduct 23 fps for Arw Wt (417 gr) = 286
    deduct 5 fps for Peep/Loop = 281 fps

    Something wrong here with OT2! … I’ve got to look into this. {#emotions_dlg.typotux (22)}
    Untitled-1

    December 15, 2013 at 5:23 pm #611162 Back to Top REPORT
    warren-p
    warren p

    Joined: 9/18/2012
    Location: Oregon
    I hate to ask this but can you please run the number’s for me using a 27.5 draw. A friend might buy my arrow’s off me but he want’s to make sure there not to stiff everything is the same except the draw length. Thank’s for the help guy’s hate being a pain in the butt.
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