Pop quiz time... what does this tell you?

Selfbows, Longbows, Recurves, Hybrids
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Dingus
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Pop quiz time... what does this tell you?

Post by Dingus » Sat Aug 01, 2015 2:09 pm

Just finished a couple of dozen. Dialing them in. Thought I'd get a little discussion going on tuning. So, what would you do?
:archer2:
bare shaft tuning.jpg
bare shaft tuning.jpg (61.87KiB)Viewed 6385 times
Mike Magee
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"How blessed is the man whose quiver is full...." Psalm 127:5

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Re: Pop quiz time... what does this tell you?

Post by Greywolf » Sat Aug 01, 2015 5:31 pm

Take a picture little further back.

Can't tell if any are bare shafts .
You never get a second chance to make a first good shot Greywolf

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Re: Pop quiz time... what does this tell you?

Post by Dingus » Sat Aug 01, 2015 7:25 pm

When you look at the pic, is there a slide bar at the right? If you, you have to slide it down.
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Re: Pop quiz time... what does this tell you?

Post by Dingus » Sat Aug 01, 2015 7:26 pm

And yes, the three to the left are bare shafts.
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"How blessed is the man whose quiver is full...." Psalm 127:5

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Re: Pop quiz time... what does this tell you?

Post by Topher » Sun Aug 02, 2015 8:58 pm

Fletch all of 'em, and go poke a bear. I have probably just proved my ignorance with that statement. Teach me something Mr. Mike, what are you looking for with your test?

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Re: Pop quiz time... what does this tell you?

Post by Dingus » Mon Aug 03, 2015 10:35 am

Well Chris, let me start off by saying I am not an expert, not even close, but...
matching the arrows to a bow, and then tuning the bow to most efficiently shoot those matched arrows, is a mix of both art and science. Lots of things to consider... weight of the bow, center shot or not, brace height, static spine of the arrow, nock height on the string, dynamic spine of the arrow, etc. This are just a few of the aspects to consider.

When I get to the bare-shaft-to-fletch-arrow comparison, I'm looking at arrow flight and positions in the target. When you look at the pic (some people couldn't see the whole pic, so try clicking on it) the bare shafts to the left of the fletched shafts indicate something. Now the questions is, what is indicated? Also, if you notice, all the shafts are at about the same level. This also tells me something. By the way, I was shooting from about 12 to 23 yards. This pic was taken after shots from about 15 yards.

So... what does this particular pic indicate?
:campfire:
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Re: Pop quiz time... what does this tell you?

Post by McClura » Mon Aug 03, 2015 1:04 pm

Mike, nearly every time if you get a group like you did to the left with bare shafts, the spine is too stiff. When you add feathers to these it will correct it sometimes. Most of the time you will have to go up in weight on the point or use a longer arrow to lessen the spine. Some of this depends on how far you are drawing also. If you draw all of your bows to the same anchor point then you will have to add weight to the point. If you can draw usually one more inch it will add about 3-4 lbs to your to the draw weight launching the arrow and this will take some of the stiffness out of the shaft.
Rule of thumb is arrows to the left of intended impact is too stiff, and to the right they are too weak.
Spine of selfbows usually need to be at least 5 lbs less than pull weight at your draw length. If you have a little flip on the tips it might take about 6-8 lb to get the right spine. Spine is all figured around 28" arrows and if you are drawing 26" that will increase your spine 3-5 lbs on a shaft if you are shooting a 125grn point.
Just by looking at the photo your nock point seems to be about right if you are hitting around the point of aim up and down.
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Re: Pop quiz time... what does this tell you?

Post by McClura » Mon Aug 03, 2015 1:05 pm

Check out this link on spine for bare shaft if your arrows with feathers are hitting where you want.

http://leatherwall.bowsite.com/tf/pics/ ... 079857.JPG

Mike
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Re: Pop quiz time... what does this tell you?

Post by Dingus » Mon Aug 03, 2015 1:27 pm

You are right Mike. All good points (no pun intended). And yes, a few things a person can do (thin the side plate, use a longer shaft ((not an option to me)), use a faster string... but I added weight. The bow and the new arrows are about as matched as I can get them. Now... it is practice, practice, and practice!
Mike Magee
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"How blessed is the man whose quiver is full...." Psalm 127:5

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Re: Pop quiz time... what does this tell you?

Post by Topher » Mon Aug 03, 2015 5:07 pm

Thanks to both Mikes for all of the info. It will be a big help tuning my stuff. I am pretty sure all of my arrows are spined to stiff.
Thanks,
Chris
(Now go shoot you a bear, GOOD LUCK!!!!!!)

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Re: Pop quiz time... what does this tell you?

Post by campcook » Mon Aug 03, 2015 6:47 pm

Mike you need to put white nocks on those shafts so they're easier to see when I"m shooting. Did your arrows in the center improve with fletching or did you compensate to get them to group? Alex

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Re: Pop quiz time... what does this tell you?

Post by Dingus » Tue Aug 04, 2015 2:14 pm

No Alex!
:lol:

I am NOT going to make it easier for you to shoot at my arrows!

:archer:

To your more serious question... the way I approach tuning is to try to get the arrows flying pretty well before I do the bare shaft tuning. I pretty well had the brace height adjusted to the "sweet spot", then the nock positioned for pretty good vertical deflection and the arrows were already well matched for the bow's weight and speed. That's when I went to work on the dynamic spine. As Mike suggested, there are several things you can do. With these arrows I added weight, to both the bare shafts and the fletched, of course. If the fletchings have to "work" too hard to compensate for the unmatched spine, the "work" (straightening out the arrow flight) cuts down on the KE. Ended up with a solid set of 510-520 grn. hunting arrows. And they are shooting better than I am!
Mike Magee
Past President, Oklahoma Selfbow Society

"How blessed is the man whose quiver is full...." Psalm 127:5

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