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Main Boards => The Bowyer's Bench => Topic started by: Kopper1013 on July 02, 2014, 07:03:00 PM
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Hey guys just finished my first bow!!! Had a blast learned a lot thanks to you guys.
So as I shot it tonight I noticed it felt real light and was dogging the arrows, slow enough to where I wouldn't hunt whitetails with it. Needless to say I was a little disappointed. So I took it in side and put it on the scale and realized I'm roughly 12lbs under where I wanted to be.
How much should I pike the limbs to try and gain my 12lbs back? And is 12lbs gonna give me a huge difference in arrow speed? Thanks guys for all your help will post pics after I pike/finish.
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Weren't you checking the weight as you tillered the bow? Will you post pics, braced, unbraced and full draw?
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Pat I really didn't do much tillering it's a glass bow and everyone said you don't really have to tiller glass, so I didn't haha
I would post pics bud haven't quite figured out photo bucket
My problem was everything slipped during glue up so automatically I went from 1.5" to 1.25" also I was going for a 64" ntn but the guys said I should start with a 66 ntn cause they thought my stack was to thick possibly, so 66 is where she sits now.
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Being a glass bow and if your draw is 28 inches or less I'd suggest cutting off 2 inches from each end and see what you get.
Won't be 12 pounds but should better.
If your draw is less than 28 might be able to go farther.
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Cutting an inch off each end should net you ~5 lbs weight gain; 2" each end ~10 lbs. If it were me, I'd take 2" off each end and use a bastard string to check the new draw weight before cutting nocks.
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It is going to depend on what the bow weight is now--lighter bows will gain less per inch than than heavier ones. I think the 5 lb. rule might be for a bow already in the 50 lb. range.
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Use this formula it will get you real close to your desired weight.
EXAMPLE:
The bow is 68" long,45 lb.@ 28",you want 55 lb @ 28"
55lb divided by 45 lb = 1.22(1.22%)
Lose the 1 (100%)
0.22 divided by 5 = 0.044
0.044 x 68" = 2.99"
2.99" divided by 2 = 1.495
So take 1.495" (almost 1 1/2") off each end.
To find out what a given reduction in length will produce:
EXAMPLE: The bow is 68" long,45 lb. @ 28",you only want to take of 2" (1"
off each end)
Take off 2" for a 66"bow
Short Way
1" x 2 = 2" 66" = 1.145 x lbs
2" divided by 68" =0.029 64" = 1.295 x lbs
0.029 x 5 = 0.145 (14.5%) 62" = 1.440 x lbs
Add 1 (100%) for 1.145 (114.5%) 60" = 1.590 x lbs
1.145 x 45 lb =51.525 lb (just over 51 1/2 lb)
Take off 4 " for a 64" bow
4" divided by 68" =.059
.059 x 5 = .295
Add 1 for 1.295
1.295 x 45lb = 58.275
Take of 6" for a 62" bow
6" divided by 68" = .088
.088 x 5 = .44
Add 1 for 1.44
1.44 x 45lb = 64.8
Take of 8" for a 60" bow
8" divided by 68" = .118
.118 x 5 = .59
Add 1 for 1.59
1.59 x 45lb = 71.55
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A piece of 1/8" braided nylon will make a good starter string.Dont use the twisted nylon will stretch real bad.
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You could laminate another .030 glass on the belly side and pick up about #15.