Please ensure Javascript is enabled for purposes of website accessibility

Explain this tuning phenomenon

Discussion in 'Tech Talk' started by Finch, Sep 9, 2011.

  1. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    BH's and FP's are hitting together. I figured I'd shoot the bareshaft once my FPs and BHs hit together. When I shoot a bareshaft (same tip weight, etc), the arrow goes crazy before hitting the target. It gets almost sideways or level (tip on the left and nock on the right.) The bareshaft hit way left of the target about a foot...which actually means the arrow completely missed the target.

    Any ideas? I surely don't want to leave this be although the BHs and FPs are hitting together. Well, I've only tried them at 20 yards so I'm not even sure if they'd hit together at 30 or 40 yards. But if they did....what would cause this?
     
  2. Matt Long

    Matt Long Weekend Warrior

    Joined:
    Aug 26, 2011
    Posts:
    71
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Soutthwest PA
    What kind of arrow are you shooting? I shot my CX piledriver (350g) bareshaft and it flew straight.....maybe its weight tho
     
  3. _DANNY_

    _DANNY_ Weekend Warrior

    Joined:
    Jun 28, 2011
    Posts:
    246
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Northern Illinois
    its sounds like a spin issue, to weak is my bet.
     
  4. Hoosier Daddy

    Hoosier Daddy Weekend Warrior

    Joined:
    Jan 20, 2011
    Posts:
    954
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Podunk
    Could be a week spine , how is your center shot ? sometimes vanes will correct a issue one doesnt see till a bare shaft tells ya there may still be a tuning problem somewhere .
     
  5. brucelanthier

    brucelanthier Grizzled Veteran

    Joined:
    Dec 11, 2008
    Posts:
    4,693
    Likes Received:
    2
    Dislikes Received:
    0
    Location:
    Southern MD
    What is your FOC?
     
  6. Hoosier Daddy

    Hoosier Daddy Weekend Warrior

    Joined:
    Jan 20, 2011
    Posts:
    954
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Podunk
    That was on my mind also Bruce , some how i forgot to type it ......lol
     
  7. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    Sorry, I left a few things out.

    I typically shoot Gold Tip XT 5575’s but today I was trying some Beman ICS Hunters (.400 spine). They are 29” long with 100 grain tips. Their FOC is 11.6 %.

    Everything I know tells me that if the bareshaft or the BH arrows are contacting left from the FPs…then it is a stiff spine. I increased the weight to almost 70 and the same still occurred. I also tried moving my rest to the right AND left.

    I am not sold it is my centershot. I swear it looks like the arrow is on a straight path and then all of sudden goes crazy.
     
  8. Hoosier Daddy

    Hoosier Daddy Weekend Warrior

    Joined:
    Jan 20, 2011
    Posts:
    954
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Podunk
    Try a 75 grain tip and mabe with a lighted nock for sh!ts and giggles and see what happens with a lower FOC with the bare shaft , whats your FOC of the bare shaft with the 100gr head ? that might be whats whipping your arrows around .
     
  9. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    I'll have to strip one to see. I've broken one today and lost the other because of this issue. :)
     
  10. GABowhunter

    GABowhunter Moderator

    Joined:
    Dec 11, 2008
    Posts:
    7,788
    Likes Received:
    1
    Dislikes Received:
    0
    Location:
    Ringgold, Georgia
    Are you shooting bare shafts with just one arrow or a couple different arrows? If only one could that particular arrow be a dud?
     
  11. _DANNY_

    _DANNY_ Weekend Warrior

    Joined:
    Jun 28, 2011
    Posts:
    246
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Northern Illinois
    is your bow tuned?
     
  12. Hoosier Daddy

    Hoosier Daddy Weekend Warrior

    Joined:
    Jan 20, 2011
    Posts:
    954
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Podunk
    If i remember correctly a few years back i had the same situation and i believe it was the high FOC of the bare shaft causing it , i'm running 12.4 % with no issues , tomorrow i'll throw a bare shaft down range and see what happens with that FOC and let ya know .
     
  13. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    Good point. The same thing happened last night when I shot of the Gold Tips. The only difference is about an inch between the two arrows.

    Ha..that is what I'm trying to achieve. ;)

    I was pleasantly surprised when I completed setting up the bow yesterday and shot FPs and BHs so close together. Just a few days ago, I took the bow completely apart (limbs off, cams & axles lubed) and replaced the strings & cables. It was some much overdo maintenance. I just had to go and screw it up by shooting that bareshaft. :)

    Cool...thanks Hoosier. I'm curious what you'll report back with.
     
  14. Tony

    Tony Legendary Woodsman

    Joined:
    Jul 25, 2008
    Posts:
    16,889
    Likes Received:
    12,218
    Dislikes Received:
    12
    Location:
    Wales, New York
    now I am no techie, but I would think a LOW FOC would cause this ... not the other way around????? TFox, Bruce, RickJames.... HELP
     
  15. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    I wonder if there really is something to this riser flex issues to the '09 Centerpivot Bowtechs?

     
  16. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    ........
     
  17. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    This guy had the same exact problem I'm having.
     
  18. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    Another account...
     
  19. soccerdan90

    soccerdan90 Grizzled Veteran

    Joined:
    Oct 31, 2010
    Posts:
    5,980
    Likes Received:
    1,818
    Dislikes Received:
    2
    Location:
    Oskaloosa Iowa
    Thats rough man! Hope you get it figured out.
     
  20. Finch

    Finch Grizzled Veteran

    Joined:
    Jul 27, 2008
    Posts:
    5,686
    Likes Received:
    0
    Dislikes Received:
    0
    Location:
    Virginia
    No biggie man...I have an Assassin that I promised I'd take hunting. :)
     

Share This Page