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Spineing a flight arrow

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Selfbowman:
On the ace spine tester it seams to spine best when the balance point is over the resting point in the middle. So does that mean put balance point at center resting point for correct spine?

Del the cat:

--- Quote from: Selfbowman on October 05, 2024, 04:19:55 pm ---On the ace spine tester it seams to spine best when the balance point is over the resting point in the middle. So does that mean put balance point at center resting point for correct spine?

--- End quote ---
Ah, just looked at a picture of the ace spine tester and the weight is automatically at the measurement point.
I'd say put he thickest point of the shaft at that point.... but I s'pose the important thing is to always do it the same...
But then, is that right? 'Cos if you have two arrows, one with the thickest point 1/3 from the front and the other 1/3 from the back. They would read the same spine but perform differently!
I tend to put my arrow on my rig with one support about 1" in from the nock, because I believe the stiffness is needed at the aft end of the arrow (I may be wrong tho'  ::))
Del

Eric Krewson:
I once made a number of barrel tapered shafts, I started to 80#-100# poplar dowels from Lowe's, barrel tapered them and matched the spine by sanding the thick part, I made them all matched 55-60#. I spine tested them on my tester and found the barrel tapered shafts shot the best at the same spine as my best shooting parallel shafts. I put the weight at the same point as I always did om my tester, right next to the swing arm under the arrow.

My point is it doesn't matter where the weight is, bare shaft test your arows after you test them and found out what spine out of the tester you use shoots true.  As long as you use the same tester and weigh position your arrows will all be fine. You may spine the arows on a different tester and get different reading, that is why I use my testers reading as a baseline for all my arrows.   

willie:

--- Quote from: Del the cat on October 05, 2024, 06:47:53 pm ---But then, is that right? 'Cos if you have two arrows, one with the thickest point 1/3 from the front and the other 1/3 from the back. They would read the same spine but perform differently!

--- End quote ---

Del, Have you tried building arrows both ways? Moving the thickest part foreward was what worked for me with the atlatl darts I make. the idea being moving the stiffest point foreward helped settle the paradox, which, as  Eric mentioned, helps retain initial velocity.

I cant remember where I saw it years a go but some turkish flight arrows actually had a small piece of lead added to affect the balance point of the finished arrow, which presumably helped the aerodynamic attitude of the arrow downrange when velocities are low.

bjrogg:
I know pretty much nothing about flight arrows Arvin. I sure would like to learn about them though.

I asked questions about them in the arrow section but didn’t get much response.

If I’m looking at your spine tester it seems different than any I’ve used. If I’m seeing it right the arrow under  pin 1 and over pin 2 and then the weight is applied on top of the shaft beyond pin 2.

I can see how a barreled or tapered shaft would be effected by the placement of shaft.

My tester is different. My shaft sits on top of pin 1 and pin 2 and weight is applied in between.

I noticed when I use it for tapered shaft arrows the flex is back further but it still measures the deflection in the center

I like tapered arrows for hunting. You get more weight front of center and the flex point being back further seems to make them straighten out faster.

I know you want the straightening out faster part but probably not the high foc weight.

I can see a real dilemma with flight arrows. Its tough enough with being able to use a high forward of center weight.

I’m sure getting clean straight flight is very, very important and everything we normally do to get it make drag or uses weight forward of center

Hopefully we can all learn something here. I’ll be watching  (-P

Bjrogg

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