I built a bow for a friend with .040 glass on the back and it came off the press at 62#. I plan to build another identical only .050 glass on the back. How much heavier draw will it be with that as the only variable?

Depends on your design but I would say a minimum of 10 lbs.

I'd say Greg is close. Only real way to know is to build it. Are you going to change belly glass thickness?

No, only variable is backing glass

Michael, my notes say that a change of .010" in glass thickness on the bow's back changes it's weight by 5 lbs. That is for a d/r longbow. Making the same change on a recurve's glass would have a greater effect due to the difference in overall glass to wood ratio.

"overall glass to wood ratio" man there's something no one talks about anymore....

For my longbows which are mild R\D .005 of thickness equals 1 pound of draw weight.

The Bow is a R/D longbow of my own design. I will glue it up and report back.

I went with a slightly thinner belly lam, like .003 thinner, went .010 thicker on the back, and it came out 3-4 pounds heavier

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