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Scaling up question

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Badger:
   If same draw length then you are not scaling up, what kind of wood are you going to be using, weight? and length. and draw length.

stuckinthemud:
Not quite the same draw length, it is increasing by 2”.  So, here is how I was guessing at things.  If you pike a bow you gain about 5lb per inch, so by increasing string length by 20cm/8” I’ll lose 40 or 50lb but then the extra draw length will counter most of that.  Working on 1mm of thickness being worth 10lb, I was thinking of increasing thickness by 3mm and adding 5mm to the width then chasing weight as normal.  Any thoughts?

Del the cat:
I'd scale the width up by the same proportion, but scale the thickness up by much less.
E.G. if the bow is 6% longer, make the thickness just 2% thicker... that should make it over weight so it can be reduced to give the correct draw weight.
If you increase thickness pro rata (e.g 6% as per example it would be way too stiff)
Del

Del the cat:

--- Quote from: Del the cat on July 22, 2024, 01:52:07 pm ---I'd scale the width up by the same proportion, but scale the thickness up by much less.
E.G. if the bow is 6% longer, make the thickness just 2% thicker... that should make it over weight so it can be reduced to give the correct draw weight. (just my guess)
If you increase thickness pro rata (e.g 6% as per example it would be way too stiff)
Del

--- End quote ---

stuckinthemud:
Oh, so length will increase by about 23 percent: a 3mm increase would represent a 10 percent change, the “model” being 29mm thick at centre and 15 at the tips, so dial it back a little? But, width at centre is currently 40mm, which means increasing that to 50mm?  Tapers would remain unchanged?

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