How to hit a target weight?

[Tron]

Newbie bowyer and new member here.  I've been looking through the threads and I'm looking for a good way to guesstimate how to much stack to have on glass/wood lam bows to hit a target weight?  Is there some kind of formula or just guess and check.  I'm building a 64 or 66 inch Hill style bow with a light draw weight.  I'm aiming for between 35 and 40 pounds (recovery bow for my shoulder injury).  How do you guys choose lam thickness and tapers for bows?

[arrowlauncherdj]

Check out Binghams weight charts for whatever length and width bow you are going to try... Then make the best educated guess based on your particular design that you can.  In general they will get you close as long as your design isnt too radical. Binghamprojects.com

[jsweka]

Tron - Here's a recipe for a Hill style bow I made about a year ago.

back glass - 0.040
3 parallel lams - 0.060, 0.070, and 0.070
1 0.002 belly taper lam - 0.100 butt thickness
belly glass - 0.040
Total Stack = 0.380
Riser was 16" from the ends of the fade outs
Limbs were 1 1/4" wide at the fadeouts.

It came in at 42# at 28"  so for a 35# bow, I'd drop that down to about 0.355.