Soliciting thoughts on stack changes

[monterey]

Folks, don't be bashful about offering up your ideas on this I won't hold anybody accountable  

I'm building a proven ASL design.  Sixty eight inches NTN.  I have an accurate model that predicts draw weight changes with stack variations, but now I'm going to shorten the riser from 18" to 14 1/2 inches.  So, that will be an increase of 1 3/4" to each limb.

What might be the draw weight change expected?

[Roy from Pa]

I normally don't give out my knowledge on glass  bows. But since it's you, I will.

5#

[monterey]

OK!  So far it's established for certain that it won't be five pounds    

Seriously, Roy, thanks.  I was thinking about the same but want to hear from anyone who has an idea on It.

[jsweka]

You're basically increasing the working limb length by 1.75" on each limb. Assuming, increasing  a limb by 1" decreases weight by 5 lbs, I'd GUESS  you'd lose 8.75 lbs. (Notice the emphasis on "guess")

[monterey]

John, thanks for the info.  It seems like a lot of weight but using that number would allow me to stay in the weight range needed.

Bow is for a young guy who is plenty strong but I don't want to accidentally over-bow him since it will be his first bow as he begins in archery.

[cunruhshoot]

The example I am giving is not the same asl bow design. The example is a 60" d/r design Kenny M form -   same stack of .300 with 18" riser is 43# and with 16.5" riser is 37#.