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What is your correct draw length vs. arm span / 2.5 method

  • I just went with arm span / 2.5

    Votes: 6 6.9%
  • my draw length is shorter

    Votes: 23 26.4%
  • my draw length is longer

    Votes: 27 31.0%
  • arm span divided by 2.5 is correct for me

    Votes: 31 35.6%
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it's incredible, how many times we have to go through this.
the wingspan method is based on "anthropometric proportion". a set of rules based on the condition that the "average" human body has specific measurements of balanced proportion. one of those balanced proportions, is that your wing span is the same as your height. if you happen to fall with this proportion, the wingspan method will be very close to your ideal draw length. if you don't, it will be close, either short or long, by the same percentage that your wingspan is either short or long, compared to your height. very few people fall into this category of equal proportion. that is why the wingspan method is considered only a "starting point" , or a "ball park measurement".
I am one of those who do fall into this category of equal proportion and my wingspan measurement /2.5 is 27.26"....my perfect draw length happens to be 27-5/16, or 27.3125".... very close to the same measurement.
if you've seen the drawing of a human body, spread eagle inside a circle, that drawing is the symbol of anthropometric proportion, established by Leonardo Da Vince, a long time ago. it's content is still used today, to design anything that has to do with the human body, fitting a design.
 

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3/8 isn't all that much difference , when you consider that the wing span/2.5 method is only a starting point to get your bow in the ball park. so many factors come into play for the final fit, that it's impossible to use it for anything but a rough idea. if that 28-5/8 has your anchor in a good position and you're not stretched out tight or leaning back, then g with it. you may find that you need to make a few small changes either way after you shoot for a while.
the main factor in deciding when are where you should be, is how well developed your release execution is. the better it is developed, the more critical the correct draw length will be in respect to how well the draw length lets your release execution run. people with very well developed and ingrained release executions, will be sensitive to as little as a twist or two, of the bow string.
 

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No way can someone feel that little of a difference. Given a blind test it would be "hope I guess the right one". Anyone that says that I'm sure can shoot 4" groups at 100 yards and uses the same pin for zero to 40 yards with no drop. It's an old tune when you been around archery for a long time. :sleep:
when I was shooting competitively and on top of my game, I could notice one twist's difference, in my draw length, by how my release execution ran. granted my execution was very well developed after almost 30 years of shooting a hinge, at that time, bit I could notice that small a difference. one twist,..... how much does that change the length of a string ?....not much.
what you don't realize is that your body is extremely exact in it's control through subconscious process, in respect to "the feel", of the activity being controlled, when you do things like that on a repeated basis.
I spent 35 years working in the papermills doing millwright work, mostly precision shaft alignment. I got to the point that I could grab a piece of shim stock and feel if it was .003, or .005 as soon as I grabbed it. I regularly proved it, to guys when they'd call me on it. I could grab just about any piece of shimstock and tell them what thickness it was by feel and when they checked it with a mic',.... I wasn't wrong very often..
some people are just built that way and have that natural ability. it's almost like they are "more aware" of what they are doing, than others are. in my own wood shop, when working on the table saw, i'll slide the fence over to where I think it should be for a particular cut, lock it down and the check the measurement, and it's usually so close that I have to look real closely to see of it is "right on", or not. ive been able to all that sort of thing all my life, I can't even say that I remember just when I started being able to do it simply from experience....I was just able to do it, as far back as I can remember putzing around, as kid, in my dad's, shop as well..
in 3d, I regularly helped setting up the courses and i would simply take a quick glance at the shot, from one of the stakes and declare a yardage, then they'd take a rangefinder shot from the same stake . I was usually always within a yard or so, for a whole 28 station course, when I would estimate to the 1/2 yard. it got to be sort of a game, they would ask me to come along as a "beer challenge", to see of I was just lucky, or whether I could actually do it consistently. very seldom, did I buy them a beer when we got back to the clubhouse.
 
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