Everyone knows that wood of the same spine varies by weight from shaft to shaft.Sometimes by a large amount.

What I dont understand is how and if 2 arrows of the same spine and length are able to be tuned the same.

I guess the question is:
Can 2 arrows of the same spine,length and tip weight shoot or tune the same if the arrow shaft's weight is different.

Example. Because I know I confused someone. Even myself.

Arrow #1 30" cedar 55 spine 125 tip   total weight 580 grains
VS
Arrow #2  30" cedar 55 spine 125 tip total weight 475 grains.

I don't think the average shooter would notice small differences in weight, say within 20 grains or so.  But a difference of 100 grains or more would not be something I would want in a well matched set of arrows.  If they are properly spined they may both fly equally as well, but I think you would see a noticable difference in where they hit the target.  The heavier arrow is going to drop a little quicker.  Matching arrow weights closer than that is easy enough to do that I can't see any reason not to.

that is exactly the answer I was looking for. I sat here and thought about it for a minute. I think I had a Dumb moment.

I agree with Whip. I have had the same thing...not quite that much difference though. Half that difference will affect the point of impact considerably at 20 yards. Pick the one that has the weight you want and use the other one for blind bale (close range) practice. I wouldn't use one that was that far off even for stumping because it will throw you off when you have to shoot at the real thing with the proper weight.

I agree with Whip.....spine (deflection) is independent of mass weight. Both shafts may appear to shoot the same at short range but you will see a difference at longer distance. Remember that most spine testers are measuring spine for 28" shafts and I notice that you are 30" and I assume that is BOP. You may see a difference in the amount of deflection between the two as you move your bracing points out.

If they are spined the same they will tune the same>

At 20 yards a normal shooter won't be able to tel the difference in impact point.  An expert shot will see that the lighter arrow will hit about 1 inch higher than the heavier arrow.

Most shooters seem to think that arrows will hit 6 inches apart if they weight 100 grains different.  Most tread archers don't shoot well enough to see any difference.

Dumb   moment?  
You lucky.

Killdeer  

yeah, we should all be so lucky as to confine our dumbness to a mere moment  :D

A 100 grain difference will not only yield a different vertical impact at further distances, it will likely also lead to  a different horizontal impact as well.  The shaft that is 100 grains heavier has the effect of reducing the dynamic spine, which would cause it to impact right of the lighter arrow.  These differences are there and measurable, but probably not terribly large, particularly at closer ranges, i. e. less than20 yards.  As Ragnarok Forge notes, most probably can't shoot the difference.

Then I must be a STUMP!!!!!

I shoot both 50-55# and 55-60# cedars with 125-145gr. points and I can't tell the differance between any of them.....

Then again, I don't shoot so good.....  :confused:

Wood forgives the most.

QuoteOriginally posted by Ragnarok Forge:
If they are spined the same they will tune the same>

At 20 yards a normal shooter won't be able to tel the difference in impact point.  An expert shot will see that the lighter arrow will hit about 1 inch higher than the heavier arrow.

Most shooters seem to think that arrows will hit 6 inches apart if they weight 100 grains different.  Most tread archers don't shoot well enough to see any difference.

This is exactly what I was looking for.

I know you already got your answer but if you want to make them a little closer in weight you can dip the lighter ones through the GL  a few more times that is if you are using GL

This is from OL Adcocks site on tuning your bow.
http://bowmaker.net/tuning.htm
"At 20 yards, most folks would see little if any difference with 100 grain variation,"

Funny, I shoot alums all same spine and weight and my arrows still don't group very well--?I'll go with the guys that say if your arrows are matched fairly close,the average archer won't notice much or any diff at 20 yds.

Alas I guess it is true -

at 20 yds, most folks would see little if any differnce with 100gr variation".....

but is that our goal?  I hope not  

 


rusty