Post by: goingoldskool on April 18, 2025, 11:51:06 PM
I need to get ahead of this... it's driving me crazy!
I have a Black Widow KB 48@28, right handed. I draw 29.5" and have 31.25" gold tip 340 arrows with 50 grain inserts and 200 grain points. Bare shaft shows nock right, but point of impact is good. I put in extra 50 gr weights on the insert, same result, 70 gr weight- no different. I went to 100 gr weight with 250 and 300 gr points and still cannot get a weak arrow!
Fletched arrows fly marvelous with the 200 gr points and 50gr weight on the insert. Am I being too picky? I'd just a soon have a slightly weak arrow in case I short draw this fall.
Any information would be appreciated!
Thanks in advance!
Rodd
Post by: goingoldskool on April 18, 2025, 11:53:35 PM
Picture of what I'm dealing with...
Post by: goingoldskool on April 18, 2025, 11:54:55 PM
Post by: Hud on April 19, 2025, 02:57:19 AM
Here is a Spine Calculator from 3Rivers Archery and Stu Miller. It is at the bottom of their site under Discover More.
https://www.3riversarchery.com/dynamic-spine-arrow-calculator-from-3rivers-archery.html
If you want to use their Spine Chart, the graphite shafts are at the top. Recurve is left and longbow is right. Use the actual draw wt. at 29.5" then go across for the point wt. above. Start with k 145 gr then work up to what you intend to use. Also, be conscious of the bow set up, and form, stay close 5 - 10 ft. then work back. Don't bare shaft broadheads. They sell a setup to paper test on their website, and you can make one or order theirs.
Post by: Roy from Pa on April 19, 2025, 06:27:05 AM
Proper way to do it is shoot a couple bare shafts along with a couple fletched shafts.
If the bare shafts group with the fletched shafts, then all is good.
If they group to the right of the fletched shafts then they are weak in spine.
If they group to the left of the fletched shafts then they are stiff in spine.
If they group high, then lower your nock point.
If they shoot low then raise your nock point.
That is for a right handed shooter.
https://www.youtube.com/watch?v=BSJ6-HjPMTM
In the link below, scroll down to the bare shaft planing section.
https://www.fenderarchery.com/blogs/archery-info/basic-tuning
Post by: trad_bowhunter1965 on April 19, 2025, 09:55:25 AM
Post by: kennym on April 19, 2025, 09:58:09 AM
Post by: Orion on April 19, 2025, 10:58:19 AM
Post by: goingoldskool on April 19, 2025, 11:10:15 AM
I do not have any 400 arrows, but I used 3 rivers spine calculator and it came out exactly on the money. 340 shaft at 31.25" with a 50 gr insert, 200 gr point and 3-4" fletching.
I'll try my broadheads and see how they fly and go from there.
Thanks again!
Rodd
Post by: goingoldskool on April 19, 2025, 11:14:59 AM
Kinda out of focus, but a straight arrow from 25 yards.