How big a spine deflection range...
#1
Nontypical Buck
Thread Starter
Join Date: Feb 2003
Location:
Posts: 2,994
How big a spine deflection range...
... will still shoot good out of the same set up bow?
I shoot 3/49 ACCs. Easton lists their deflection as .390. I was toying with building different aluminum shafts, and try to figure out what might work with my bow set up. Easton' s shaft selector gave me a range of .34 to .405 as still working for my bow, in 5 different aluminum shafts, 2117 (which I' d prefer if it would shoot well, it' s at .405), 2216, 2314, 2315 and 2413.
That struck me as a pretty wide range of spine. As this aluminum stuff is all new to me, can someone give me any pointers on picking the correct spine? Should the above range work well?
I shoot 3/49 ACCs. Easton lists their deflection as .390. I was toying with building different aluminum shafts, and try to figure out what might work with my bow set up. Easton' s shaft selector gave me a range of .34 to .405 as still working for my bow, in 5 different aluminum shafts, 2117 (which I' d prefer if it would shoot well, it' s at .405), 2216, 2314, 2315 and 2413.
That struck me as a pretty wide range of spine. As this aluminum stuff is all new to me, can someone give me any pointers on picking the correct spine? Should the above range work well?
#2
Fork Horn
Join Date: Feb 2003
Location: Holland
Posts: 182
RE: How big a spine deflection range...
Spine.
I have read alot about it and i did alot with it to.
Now that you brought up the topic, i went back reading againg.
I think one of hte most underetimated things in archery is spine.
More to the fact that where we find constant innovation in bows, the arrow has not changed in shape in thousands of years.
Spine did alot for my archery.
We are all to much hanging at the Easton lists i believe.
If easton says it true, its true.
Easton measures spine at a 29" shaft lenght over a 28" span.
In the middle of this 28" span they hang a 880 gram weight.
Than they measure how much this shaft is bending.
Well, thats a simple thing to build was my opinion, and so i did.
I worked a bit with mirrors and clocks there i had a ' spine tester'
Maybe it had been better if i didnt build it, because its something to go crazy about.
I found out about the difference in spine between alu' s and carbons, brand X to brand Z.
After shooting a easton alu arrow in a foam target for 10 times it lost for about 40% of its natural spine!
After those 10 times they become weaker and weaker but not so fast as when they are new.
This told me i had to be very secure about strait impact.
Another thing i learned is the fact that when you start to compare new carbons out of the box you better make sure you are very, very good friends with the shopowner because in a set of 12 ACC i had 4 same sized arrows!
Now i have to say that the difference between the arrows is so little that I dont believe there is anyone in the whole world that would see the effects of this.
I even dont believe that a shooting machine would notice.
What i did with it?
I found out i could easy go 1 to 2 sizes lower in weight that Easton tells me.
Therefor i get a wide variaty to play with where it comes to point, inserts, vanes, nocks, FOC' s, arrow weight etc. etc.
Strait flying arrows is what i like to see.
And thats is all about spine.
And that my friend, is what makes archery my favorite thing for the last 30 years.
I have read alot about it and i did alot with it to.
Now that you brought up the topic, i went back reading againg.
I think one of hte most underetimated things in archery is spine.
More to the fact that where we find constant innovation in bows, the arrow has not changed in shape in thousands of years.
Spine did alot for my archery.
We are all to much hanging at the Easton lists i believe.
If easton says it true, its true.
Easton measures spine at a 29" shaft lenght over a 28" span.
In the middle of this 28" span they hang a 880 gram weight.
Than they measure how much this shaft is bending.
Well, thats a simple thing to build was my opinion, and so i did.
I worked a bit with mirrors and clocks there i had a ' spine tester'
Maybe it had been better if i didnt build it, because its something to go crazy about.
I found out about the difference in spine between alu' s and carbons, brand X to brand Z.
After shooting a easton alu arrow in a foam target for 10 times it lost for about 40% of its natural spine!
After those 10 times they become weaker and weaker but not so fast as when they are new.
This told me i had to be very secure about strait impact.
Another thing i learned is the fact that when you start to compare new carbons out of the box you better make sure you are very, very good friends with the shopowner because in a set of 12 ACC i had 4 same sized arrows!
Now i have to say that the difference between the arrows is so little that I dont believe there is anyone in the whole world that would see the effects of this.
I even dont believe that a shooting machine would notice.
What i did with it?
I found out i could easy go 1 to 2 sizes lower in weight that Easton tells me.
Therefor i get a wide variaty to play with where it comes to point, inserts, vanes, nocks, FOC' s, arrow weight etc. etc.
Strait flying arrows is what i like to see.
And thats is all about spine.
And that my friend, is what makes archery my favorite thing for the last 30 years.
#3
RE: How big a spine deflection range...
ORIGINAL: Rangeball
... will still shoot good out of the same set up bow?
I shoot 3/49 ACCs. Easton lists their deflection as .390. I was toying with building different aluminum shafts, and try to figure out what might work with my bow set up. Easton' s shaft selector gave me a range of .34 to .405 as still working for my bow, in 5 different aluminum shafts, 2117 (which I' d prefer if it would shoot well, it' s at .405), 2216, 2314, 2315 and 2413.
That struck me as a pretty wide range of spine. As this aluminum stuff is all new to me, can someone give me any pointers on picking the correct spine? Should the above range work well?
... will still shoot good out of the same set up bow?
I shoot 3/49 ACCs. Easton lists their deflection as .390. I was toying with building different aluminum shafts, and try to figure out what might work with my bow set up. Easton' s shaft selector gave me a range of .34 to .405 as still working for my bow, in 5 different aluminum shafts, 2117 (which I' d prefer if it would shoot well, it' s at .405), 2216, 2314, 2315 and 2413.
That struck me as a pretty wide range of spine. As this aluminum stuff is all new to me, can someone give me any pointers on picking the correct spine? Should the above range work well?
All carbon and A/C technology is much more forgiving of spine due to their quicker recovery. That is why there are generally fewer sizes in carbon as compared to Aluminum shafting.
There are far too many variables from set-up to set-up to give a flat " X" answer. Experimentation is the only way to see.
#4
Giant Nontypical
Join Date: Feb 2003
Posts: 9,175
RE: How big a spine deflection range...
Rangeball, I agree with both Raymond and Jeff. Raymond is right in that too many people take the Easton chart as gospel when the chart really does nothing more than get you into the ballpark and give you a place to begin experimenting. And Jeff is right that you must experiment with different arrows to find out which is best for your shooting style, form and equipment.
Just from my experience and what I' ve seen with durability, I' d look at trying the 2216' s and 2315' s first. Compared to those two shafts, I' ve found the 2117' s a little too easy to bend and 2314' s a little too easy to crease. 2413' s would be even easier to crater out with a close hit from another arrow.
If you belong to an archery club, a very good place to find a variety of arrow spines is the lost arrow bucket. Just be sure to put ' em back when you' re done borrowing them.
Just from my experience and what I' ve seen with durability, I' d look at trying the 2216' s and 2315' s first. Compared to those two shafts, I' ve found the 2117' s a little too easy to bend and 2314' s a little too easy to crease. 2413' s would be even easier to crater out with a close hit from another arrow.
If you belong to an archery club, a very good place to find a variety of arrow spines is the lost arrow bucket. Just be sure to put ' em back when you' re done borrowing them.
#5
Nontypical Buck
Thread Starter
Join Date: Feb 2003
Location:
Posts: 2,994
RE: How big a spine deflection range...
I had assumed the 2117s with the thinner diameter and thicker walls would have been the most durable, which was why I was leaning their way.
No archery club for me, or around the area Only way I can try a bunch is with my wallet, which I want to avoid at all costs.
I only plan to look into aluminum if I get a new bow, so maybe by then the data will be loaded into TAP or AA and someone will be nice enough to narrow down the choices for me a bit, hopefully.
No archery club for me, or around the area Only way I can try a bunch is with my wallet, which I want to avoid at all costs.
I only plan to look into aluminum if I get a new bow, so maybe by then the data will be loaded into TAP or AA and someone will be nice enough to narrow down the choices for me a bit, hopefully.
#6
Giant Nontypical
Join Date: Feb 2003
Posts: 9,175
RE: How big a spine deflection range...
Yeah, I can follow your reasoning on the 2117. Seems like it would work that way, but that' s not what I' ve found in practice. I' ve pretzel bent those suckers on hits that 2216' s will take with no damage at all.
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