Spine alignment?

Rangeball · 10-23-2002, 03:29 PM

This is a big deal in golf shafts. Big money is spent making sure each shaft is marked to show where similar shafts bend the same, with the idea being to promote repeatablility in returning the club to the ball the exact same way with each swing and club.

Basically, the theory is that even within equal spec shafts, if they not installed with the bend of the shaft identical, each shaft will perform slightly different, producing different results.

Is this applicable to arrow shafts? I mean, just because a shaft is rated with an identical spine, if the components aren't assembled the exact same way, won't the potential for them to react differently exist?

Does anyone do spine alignment in arrow shafts?

pdq 5oh · 10-23-2002, 08:25 PM

Rangeball, a golf club moves through a, basically, horizontal plane. An arrow through a verticle plane. I'm not sure if it matters to an arrow, given the different dynamics involved. It may account for the fact that some arrows won't group with others from the same batch. Quite honestly when I run into this, I just cut them down for my son. I've never checked to see the reason, I just assumed it was spine related. Good question, though.

Phil.
"Could you guys be quiet, my dad's trying to shoot."<img src=icon_smile_shock.gif border=0 align=middle>

Edited by - pdq 5oh on 10/23/2002 21:30:04

ACLakey · 10-23-2002, 08:36 PM

Rangeball
I always float my shafts prior to putting them together. By placing them in a bath of water the heavier side of the shaft will always rotate to the bottom. I mark each one and put my cock feather on the mark. I seemed to help eliminate that one flier out of a dozen you sometimes get. As an example a guy at work had two arrows out of six that just wouldn't group with the others no matter what he did. We stripped the shafts down and floated them. After reassembling them all six grouped together.

>>>----Andrew---->

Rangeball · 10-24-2002, 07:41 AM

AC, Very interesting... You can float a golf ball in a solution of water and epsom salt, spin it, and the heavy side will sink as well. Put a dot on top, place this dot up when you putt, and it provides a truer roll...

I'll have to give the floating method a try when I buy my ACCs, although with them I suspect the act will be moot...

FLHunter · 10-24-2002, 08:54 AM

Range,

Let me know if you can get the ACC's to float! We have a large pond at our range where several the targets have over the water shots. On a few of them if the target is missed, well the arrow is lost if it doesn't float. Carbons and ACC's don't float too well from what I've seen. Maybe floating a bare shaft may work, but how do you plug it properly so it remains uneffected by the material at the ends forming the dam? If the plug material is not consistant a bad float may occur giving a bad indication of spine.

Aim Hard!

Rangeball · 10-24-2002, 09:09 AM

I have no idea... AC?

JeffB · 10-24-2002, 12:02 PM

You would have to put them on a spine tester to see where the (minute) amount of variance would be.

RB...the tru-flite PRO series arriows are built this way. With the cock vane/feather in the highest spine "side".

This way every arrow bends exactly the same way (assuming the spine variance is not bad).

JeffB <img src=icon_smile_big.gif border=0 align=middle>