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Scaling up question

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stuckinthemud:
I need to increase a bow design by 12” in length.  I can change width and thickness but the draw weight needs to stay the same.  Any ideas how I can calculate the initial dimensions based on the original bow?

mmattockx:
You have more questions to answer first. Just offhand these come to mind:

1) Same draw length?
2) Same wood species?
3) Is max performance a priority?


Mark

stuckinthemud:
Same wood (yew), same draw length, needs to be a rugged, not fast, heavy ELB

willie:
within the same design, one would increase weight by increasing width, but thats not being asked for
within the same design, one would increase drawlength by increasing length, but ditto

if you want someone to estimate how much thickness needs to be increased when adding 12 inches, one would need to know if you are making a 24" bow into a 36" bow or making a 60" bow into a 72" bow, in other words a proportion.
and if the bow is "arc of circle" bend in handle, or has non working areas like handles or levers

stuckinthemud:
I’m going from a 95 cm 250lb bow with a 30cm draw to 115cm 250lb bow with 35cm draw length, yew ELB, slightly stiff across centre 2 inches but basically working through the centre, arc of circle tiller.  Yes it is a crossbow, but a bow is a bow is a bow.

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