i know there is no precise formula for this sort of thing but...i am building straight hill style longbow using all parallel lams. i am looking for a 55@28 bow. since this is my first glass laminated bow i know you guys can give me a better start than if i were to guess. i have 0.04" glass for the front and back and am thinking about using 4 woods lams. what total thickness of the wood lams do you think i need? thanks, Dan.
This may help...
http://www.3riversarchery.com/pdf/LongbowChart.pdf
There is also a thread about this same thing some where..
try a search to Lam thickness, or lam chart
Maybe this will help,the top right is a strait 68" longbow with a .002 taper I think.I would guess .324 wood lams(butt thickness or thickest point) + .080 glass to equal .404 .This is from Binghams catalog.
(http://i32.photobucket.com/albums/d34/kennym/100_1358.jpg)