Poundage ratios

[Krasus]

Just how accurate is the excel spreadsheet thats on tradegang for calculating the total stack adjustments ( to clone a bow but change the poundage )? I also thought about just doing a standard  ratio equation but the numbers seem just to high. Thoughts?

[mikkekeswick]

I've used the Stack Calculator a few times and it has always been correct.

[Mad Max]

seems to work good for me.

[KenH]

Works great for me too.   I build a Prototype shape with a single 1/4" or thinner pine lam, and finish it out just enough to a decent string on it, and a draw weight taken at 28".   Usually the prototype costs me about $40 (two strips of the cheapest fiberglass, some epoxy, and a slice of clear pine).

That gives me everything I need to calculate the correct stack thicknesses for various weights of bows of that shape using pretty woods.

[Krasus]

Awsome. Thanks

[Wagstaff]

It works in a limited way..

For instance.. If you are changing your stack of core lams only, yes its fine.  If you are comparing a stack and stepping up or down in glass thickness, the changes are more dramatic than it will predict.!  YMMV