I was looking at a chart for draw weight. It gives limb thickness for weight desired. I am looking to build a 64" r/d with a final weight of 50lbs.
My question is. Is the thickness given the thickest part of the limb? When using tapered lams the limbs will be thinner at the tips???
That is referred to as 'stack thickness', it is the total thickness of the glass and lams, tapered lams are measured at the butt, the thickest part.
As this will be my first laminated bow i have been looking threw a lot o builds. I was going to go with a "poorfolks" design, but have now decided to go with Binghams 64" r/d.
I plan on going with this stack.
- .040 glass
- .100 tapered lam @.001/inch
- .100 parallel action boo
- riser
- .100 taper lam @ .001/inch
- .040 glass
This will give me .380" total, putting me between 50-55lbs.
Sound ok?
http://www.binghamprojects.com/Bow%20Draw%20Weight%20Chart.pdf
The above is Binghams chart information, for me they always tended to be a bit heavy.
What I would do since you are using Binghams design is order the material from them as well this time. Just tell them which plans you are working off of and they will send the proper combination of lams and glass for your bow weight.
Measure the glass, each lam, parallel and taper butt thickness and start a log for next time, bow length, finished weight, etc.
Since it is their design, they will know what lam combo and glass works best, and keeping a log you will know what to get from other sources for next time, and the time after that....trust me.
you can have a #5-#7 plus/minus variance in poundage for each inch difference in riser length--if you use binghams charts-be sure to use the length of riser recommended in their print/design or adjust your stack
and then you have to build one[or more!lol] to truly figure it out
good luck