Main Discussion Area > Arrows
why tonkin bamboo shafts and arrows might fail.
artcher1:
Hi Jim, once you know your spine requirement for your bow it's a simple matter of a little math to know what spine to order. Add 5# of spine for every inch over 28". Next, your supplier will have to add 5# for every 1/2" of weight forward of the shaft. For example: you want to build a 40# arrow that's 29.5" long BOP using a 125gr point. You would add 7-8# for that 1 1/2" over the normal starting point of 28", and then say you have 1" of weight forward on the shaft, you would add 5# per 1/2". That's 7-8# plus 10# added to the shaft. So if I've done my math correctly, you would need a 57-58# spined shaft using a 125gr point to achieve a 40# dynamic spined arrow...….Art
razorsharptokill:
1" of weight??
artcher1:
1" of weight forward from the center of the shaft Jim. Find the center of your shaft and mark it, then balance the shaft on a pencil or something and mark that. Distant between the two marks is the amount of weight forward that you must account for...….Art
Mesophilic:
Since this topic is about bamboo breaking, I figure I'll mention my issues with it.
I've tried a few different bamboo shafts, I won't go in to supplier details for obvious reasons. They do great when we actually have humidity. I live at 7500 feet in New Mexico and our normal humidity levels are extremely low most of the year, below 10% a lot....combine the elevation and lower vapor pressure, its sort of like a wood freeze deyer up here.
We had an unusually wet summer in 2019. I shot the heck out of my bamboo arrows. Shot a bunch of 3D, had many misses and didn't break a single shaft. Bounced them off of trees, hit rocks, etc. Then the weather dried out. And now any deflection off of a tree or stump shatters the bamboo. Rocks are instant death. My douglas fir shafts suffer from the same fate.
My moisture meter regularly reads wood here at sub 5%, not just on the outside mind you, but even after freshly cutting in to it, so I have to assume my arrows would have a similar moisture content.
I'm in the process of throwing in the towel and eyeballing carbon at this point.
I throw this out there just as a suggestion for Todd to take environmental factors in to consideration as you analyze breakage.
DC:
Have you tried throwing in a wet towel? I'm still thinkin' that moist storage is your answer. :D
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