Page 1 of 2 12 LastLast
Results 1 to 6 of 8

Thread: So what IS the effect of arrow stiffness ?

  1. #1
    In the Green
    Join Date
    May 2018
    Location
    New Zealand
    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts

    So what IS the effect of arrow stiffness ?

    Greetings ,

    Been trying to read everything on spine stiffness for recurve archery.
    Everything about bare shaft tests, where they land , when they are too stiff or too weak, poundage,
    the Easton arrow charts and so on.
    I have tried the bare shaft tests , and tried two grade weaker spines , but to be honest
    even the weaker ones landed to the left, when unfletched. Which leads me to think that you
    have to be a pretty good shot, with good technique , to be able to make some valuable conclusions.
    Which leads me to the main question :
    How does an "incorrect spine" manifests itself.
    Is it mainly the grouping that goes to pot : will you never be able to get a good grouping if your
    arrows are one stiffness grade out from what it should be, ?
    Or is it just another fine tuning aspect , that only really good archers will notice , and relative novices barely ?
    Would the correct arrow spine all of a sudden reduce your grouping from 15 inches to 5 inches at 60 meters ?

  2.  

  3. #2
    It's an X AIUK subscriber. Rik's Avatar
    Join Date
    Jun 2005
    Location
    Carrickfergus
    Posts
    4,924
    Thanks
    16
    Thanked 384 Times in 349 Posts
    Okay, some basics...
    "match" is to do with how the shaft clears the bow, not grouping as such.
    If you've been looking, you will have seen the diagrams and high speed film footage of how that happens and how the shaft bends first in towards the handle, then away.

    "stiffness" is a proxy measure for that bending frequency. "stiffer" = bends quicker.
    But it only works within a design of shaft, so comparing shafts of different designs can result in getting a different spine match.

    So with matching an arrow you're attempting to get a shaft that puts that second bend as cleanly around the handle as you can - reduces the chance of contact when your variations (and mistakes) are added into the equation.

    So in that context, you can see that a poor match is likely to dramatically mess up grouping. A good match is not a guarantee of good grouping (you can always screw up enough to negate it, or have something in your setup which will interfere).
    It also becomes apparent why going stiffer than the absolute good match is often not a problem - the shaft is bending less, which can help clearance, or be adjusted for to avoid resulting problems.

    Tuning is something separate from this, and is more to do with tweaking things to fit you. The reason you have to be quite good to do it successfully, is that otherwise you're likely to be varying and drifting in your execution enough that the tweaks you do in one session won't be correct for the next one... Ever seen people who seem to be constantly tuning?
    Ever tried? Ever failed?
    Try again. Fail again. Fail better! - Beckett

    The marksman who hesitates is lost. Just take it for granted that you are going to hit and fire away before you have time to doubt the certainty of success. - Annie Oakley, 1894.

  4. The Following 2 Users Say Thank You to Rik For This Useful Post:

    4d4m (25-04-19), albatross (29-04-19)

  5. #3
    In the Green
    Join Date
    May 2018
    Location
    New Zealand
    Posts
    8
    Thanks
    0
    Thanked 0 Times in 0 Posts
    OK , thanks for that Rik.

  6. #4
    In the Gold Kernowlad's Avatar
    Join Date
    Jan 2017
    Location
    Cornwall
    Posts
    739
    Thanks
    59
    Thanked 40 Times in 33 Posts
    Nice one Rik; well explained!

  7. #5
    In the Blue

    Join Date
    Jul 2014
    Location
    Leeds
    Posts
    273
    Thanks
    59
    Thanked 33 Times in 29 Posts
    Excellent, thanks Rik! The best, most concise and understandable explanation of spine and tuning I've read in 4 years of archery.
    I'm going to nick that for our club's Facebook group if you don't mind.

  8. #6
    It's an X
    Join Date
    Mar 2006
    Location
    Poole uk
    Posts
    21,217
    Blog Entries
    1
    Thanks
    3
    Thanked 1,096 Times in 946 Posts
    I agree with both Kernowlad and 4d4m. great post.

Page 1 of 2 12 LastLast

Similar Threads

  1. Arrow stiffness- confused
    By Hens Dad in forum Methodology, Tuning, Coaching etc.
    Replies: 6
    Last Post: 15-10-12, 04:32 PM
  2. Arrow stiffness tuning?
    By geoffk in forum Recurve Bow
    Replies: 6
    Last Post: 26-12-08, 06:52 PM
  3. Arrow Spine and Stiffness
    By Thunk in forum Recurve Bow
    Replies: 29
    Last Post: 27-05-07, 12:50 AM
  4. Arrow stiffness?
    By Dave in forum Methodology, Tuning, Coaching etc.
    Replies: 15
    Last Post: 25-05-05, 04:09 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •