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Understanding cane spine

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jonathan creason:
I'm getting ready to jump head first into this whole cane arrow making thing.  I've got about got all the materials gathered to make my spine tester, got a good bit of river cane drying, and I've got some Tonkin on the way.

Anyway, I think I'm starting to understand how you adjust the spine on cane for length, etc.  My question is about the dynamic spine in relation to head weight.  I'd like to shoot something in the 150-175 range, provided they fly well.  The bow I have on the way is supposed to finish in the 50-55# range.

aero86:
well, since the cane/bamboo is tapered, you add a bit of spine for that, you add spine for each inch over 28, and you add spine for every 15 grains over 125 i believe.  someone correct me if that last bit is incorrect.

so if you have an arrow thats 29 inches, with a 150 grain head, id say shoot a 65# spined arrow  maybe more with that head.

DanaM:
Tapered shafts reduce spine somewhat, in the 5 to 10 lbs range, leave em long and if their to week cut em down little by little :)

Mechslasher:
depending on how much your cane tapers, you will need to add 5-10#.  i would need your cane's taper, arrow length, bow weight, center cut, recurve or longbow, and exact point weight to give a "good guess" as to what spine you will need to look for.  all of these factors go into a formula i use to calculate spine.  

aero86:
i still wanna see that formula mech ;D

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