Riddle me this.......

[Lewis Brookshire III]

I have been shooting Arrow Dynamics for so long now that I forgot what spine Woodies I used in the past that worked. I wanted to see what you guys thought. My bow is 49@26"and cut to center,, I pull 26.5" and would like the arrow to be 28" long......also I use 200gr glue on heads. I would like to use a tapered Doug fir arrow......what spine do you think I should be using?

[lpcjon2]

55# (maybe 60#)with the length being 28 and tapered, and the 200 grn the head weight may weaken it but the length will compensate for it. JMHO

[ron w]

50-55 or 55-60, you them can change point gr. and or length to get is spot on.

[Fletcher]

I'm coming up higher than these guys.  Figure 50 lbs draw weight, add 10 for cut to center and a hard string, plus another 10 for the 200 gr point and I come up with a 70 lb spine.  28" arrow is my baseline, so no correction needed there.  Every bow and shooter combination is a little different which is where some test arrows really prove their worth.  You could also go a little light in spine and build the shelf out to tune them.

[Orion]

I agree with Fletcher, maybe 5# less (65#) because you're drawing an inch and a half less than 28 inches.

[**DONOTDELETE**]

Originally posted by Orion:
I agree with Fletcher, maybe 5# less (65#) because you're drawing an inch and a half less than 28 inches.

X2 on this for a tapered DF shaft at 26.5" draw.
maybe even 60/65. you can always pad your strike for fine tuning.

[monterey]

I'd go 60 to 65 and cut a bit long to start.  Finalize with adjustments to arrow length, strike plate/center cut and brace height.

[T Lail]

I also would go 60/65 and leave a little long and you'll be able to dial it in perfectlly.....

[Pete Patterson]

If I can remember correctly from a decade ago, there is a formula as relayed to me by someone that goes like this:  Spine of a wooden arrow is measured across a 26" span to equate spine to bow weight.  So if one's draw is 26" and the bow weight is 49lbs, a 49 lb spined arrow is required.  For each inch variance from a 26" draw, the arrow spine increases or decreases by about 3 to 4 lbs.  Therefore, for a 26.5" draw you would need about 1.5 to 2 lbs more arrow spine than your 49lb bow.  This of course will vary some depending on how center cut your bow is and maybe some other factors.  But it looks like 50-55 lb spine is what you need.  Disclaimer: I'm old!

[Lewis Brookshire III]

Thanks guys.......I think I am going to try 55-60 and build out the strike plate if they are too weak.

[Lewis Brookshire III]

I might actually get a 55/60 and a 60/65 and test them first. Thanks again for all the posts guys!

[monterey]

Give Stu's calculator a try.  I've found it to be dead on when my inputs are correct.

[maxwell]

I shoot your specs and draw, my 28.5" tapered surewoods at 60-65 with 125 eclispe heads fly perfect, so I might try 65-70 with 200 up front.  I'm shooting a Stewart slammer 62" 48@ 26".