Home Forums Friends of FOC adding weight to rear o f shaft…affect on spine?

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    • Doc Nock
      Post count: 1150

      Ok…I got a guy finally interested in EFOC… but I’m running amuck of some very old data from another website I used to rely on for tuning and the new EFOC tuning venue.

      1) What effect on spine(ONLY SPINE NOT EFOC) does adding weight to the REAR of an arrow have?

      2) If I draw 28.5 and shoot a 30″ arrow to spine right won’t someone who shoots that same arrow at 27″ draw find it weak cause the longer the shaft, the weaker then spine? (that is beyond your normal draw length?):?:

    • Ralph
      Moderator
      Post count: 2554

      Would we be shooting the same poundage at 28.5″ and 27″? Before I decide to let my thinker work. Probably won’t know nothin anyway but just wonderin.:D

    • Doc Nock
      Post count: 1150

      Don’t matter, Ralph.

      Generically speaking, does weight added to the rear of an arrow affect the spine? Weaker or stiffer?

      I KNOW I read it somewhere and have seen it…

      I KNOW it affect EFOC (rear weight) more than front weight, but we’re not all into EFOC…just wrestling with memory at this sage age…and thought for sure that rear weight stiffened… but my counter part argues that point!

    • Ralph
      Moderator
      Post count: 2554

      Looks like to me that your #2, asking about weaker spine, would pertain to poundage.

    • Stephen Graf
      Moderator
      Post count: 2371

      Simple answer is yes.

      Add weight to front of arrow, arrow gets weaker.

      Add weight to rear of arrow, arrow gets stiffer.

      It’s easy to understand if you remember that a heavier arrow shoots more slowly. Adding weight to the rear of the arrow makes the bow shoot more slowly, and since the weigh is in the back, the arrow doesn’t have to push against it, which in turn makes the arrow act more stiff.

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