Can someone tell me what the spine is for a 2315 aluminum arrow?
Thanks!
Spine is 0.340" AMO
Bigcountry is right, I think that what they use for the 340 GG shafts now, 300 is a 2317.
Eric
OK, but what does that translate into pounds? I'm trying to figure out what spine wood shafts to order based on the fact that 2315s shoot well out of my bow. I seem to remember that they are in the range of 110#.
According to Arrowsbykelly charts, a 2219 is close to teh same AMO spine as a 2315spine. And according to his chart, yourlooking at 95#
http://www.arrowsbykelly.com/Spine_Charts.html
Thanks. 2219s are clearly weaker in spine, based on comparison of them to 2315s shot out of my bow. Unfortunately, 2315s are not on Kelly's chart.
ttt
Jeff,
The spine of a 2315 is 92.1 lb. For any aluminum or carbon shaft the spine can be calculated by dividing 31.5 by the deflection. For the 2315 deflection is .342" so: 31.5/.342 = 92.1 lb.
This calculation is derived from beam deflection theory that I used to translate between wood spine test methods and the aluminum/carbon methods.
I have verified the calculations with measurements.
Kevin
Thanks Kevin! I just had another TradGang member PM me with the same spine. I would have thought it was higher than the 2219, as the 2219s are very clearly weaker than 2315s shot out of my bow (same length, tip weight, etc). I guess the heavier weight of the 2219, coupled with its smaller diameter that brings it closer to center on my bow in effect makes it a weaker-spined shaft. Also, my 90-94# POC arrows (same length and tip weight) show a bit weak; these are 23/64" diameter like the 2315s, but heavier. Looks like shaft weight contributes significantly to overall/dynamic spine.
Thanks all! :campfire: