| From: Crow
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| Date: 22-Jul-16 |
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Am i correct in my thinking here. I want to get this long bow but its 54 at 30 thats 1.8 lb per in of draw which would make it 48.6 at 27 which is what i draw.Does thisway of calculating work out ok in the overall draw lb stack or whateve r?
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| From: pdk25
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| Date: 22-Jul-16 |
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Not really. I have always heard that you need to consider brace HT into the equation. Assuming a 6.75" brace by, and another 1.5 inches for the shelf, you gain 54# over (30-6.75-1.5) inches, more like 21.75", so around 2.5# per inch. That would be around 49#@28", and 46.5#@27". At least that is how it was explained to me, and tends to work out more like what I have experienced.
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| From: fdp
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| Date: 22-Jul-16 |
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It works out close enough as a general rule. The only SURE way to know is with a bow scale and marked arrow. It won't work to determine stack. To actually do that you have to weight the bow at every inch of draw to determine if there is a significant spike in load as the draw length increase.
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| From: fdp
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| Date: 23-Jul-16 |
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Holezone, I think it was Bob Burton (he may come along in a few) that told me one time when we were discussing this subject in PM's that he had seen some straight limbed longbows that would gain 6 or 8lbs. per inch after 28".
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| From: pdk25
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| Date: 23-Jul-16 |
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Yeah, obviously my estimate is based on being at a draw length that is within the nearly linear range of the curve. If you bow isn't long enough for, or of a design to handle, your draw length, all bets are off. In these situations, you can roughly divide the bow weight by 10, and that is how many pounds you gain or lose for 2" draw, so a 50# bow gains/loses 5# per 2", a 60# bow 6#, and so on.
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| From: camodave
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| Date: 23-Jul-16 |
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Check out peteward.com bow testing for some good information on force draw curves...a Border Covert hunter for example gains less than a pound per inch near the end of the draw cycle...my Kodiak Magnum gains 10 pounds between 28 and 30 inches
DDave
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| From: JustSomeDude
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| Date: 23-Jul-16 |
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My 66" 37#@28" goes to 41# @29" But my 69" 55#@28" only goes up to 57# My 60#@28" recurve goes up to 63#@29"
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| From: hunterbob
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| Date: 24-Jul-16 |
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I just put a 64" black widow longbow on a cheap digital fishing scale that goes to 80# . The widow is 64" 54@30 and at 28" it was 48# and at 27 inch it was 47#
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| From: Crow
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| Date: 24-Jul-16 |
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Cant wait to shoot that widow. Big smile
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| From: Orion
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| Date: 24-Jul-16 |
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You're in the low to mid-draw length range, so the 2.5# per inch that PDK computed for you is pretty close.
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