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Bare shaft testing and spine?

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Bare shaft testing and spine?

Old 12-31-2002, 08:51 AM
  #1  
bjk
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Default Bare shaft testing and spine?

While bare shaft testing, the arrow impacts with a left tear. Decreasing the point weight helped, but not nearly enough. Also, I don't want to decrease the point weight too much as this will be a hunting rig. I have read about adding tubing or cord to the inside of the arrow to increase stiffness. Any additioanl info, or places I can read about this process would be greatly appreciated. I was thinkning that if I could add a length of something inside the arrow, it might give me the spine I need, as well as boosting the weight to make for a hard hitting arrow.

Any thoughts or info is greatly appreciated.

Brian


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Old 12-31-2002, 10:23 AM
  #2  
Giant Nontypical
 
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Default RE: Bare shaft testing and spine?

I don't quite understand about the left tear... Are you paper testing with bare shafts?

Just as a point of reference, you can cause an arrow to react stiffer by raising the bow's brace height. If you have extra arrow length, cutting off an inch will increase the arrow's spine by about 5 pounds.

Most of the tube type weighting systems add weight without affecting spine.

If you could give more info about your draw weight, draw length, arrow type and size, tip weight and release method, maybe someone can give you a better answer than I can.

Edited by - Arthur P on 12/31/2002 10:24:57
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Old 12-31-2002, 01:29 PM
  #3  
Nontypical Buck
 
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Default RE: Bare shaft testing and spine?

also the type of string material, the number or strands it has, the placement of your silencers, and the placement of your "pressure poit" on your rest all affect how an arrow ACTs (dynamic spine).

I dont think adding stuff to the inside is consitent enough to warrent doing it. I have heard though adding enough to the nock side will make an arrow act stiff, something I have never tried, just heard. Definatly dont add it to the point side as it will decrease spine wt.

To touch on one thing Art said. 5lbs pure inch cut off....dont go chopping 1 inch at a time, if possible due it in 1/4" intervals (maybe 1/2&quot.

You can get stickbows to shoot just as perfect as a compound with the right setup! It takes some time and a stickler for details but its definatly obtainable and everything comes down to arrow spine!

Last but not least, do you want a hard HITTING or a long PENETRATING arrow? There is a difference, Ke vs Mom! example, 2 cars collide, car 1, a 4door sedan, car 2 one of those new ugly beetles. Upon impact those two cars exert KE, immediatly after impact, whatever happens, (probably car 1 completly ruining the bettle due to sheer mass alone) is due to the momentum the two cars have. Now ya have to take into consideration, car design, style of impact head on, angle etc etc, things of this nature. Like in arrows, diameter, bh design, spine, weight, speed, and most imporatantly was it even flying straight! You can have what you think the perfect setup, but if the arrow has any wobble to it at all, you are wasting much more then you think you have!
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Old 12-31-2002, 01:30 PM
  #4  
bjk
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Default RE: Bare shaft testing and spine?

The bow is a Check-Mate Raven @ 55#. My draw is 27"'s. The arrows are bare fiberglass shafts that I am paper tuning. I now realize this may be a bad idea. Tonight, I am going to fletch a couple and see howe they fly. My brace height is currently at 8-1/4"...I will check to see were the limit is for this bow. Last night I tried 125gr and 145gr tips on a bare fiberglass shaft that weighed in at ~390gr before adding the point. I am shooting split fingers using a black widow style release. I might be able to trim off a 1/2 inch or so, I'll know when I get home.

Thanks for responding...any additional info you could provide would be great.

Thanks again
Brian
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Old 12-31-2002, 04:37 PM
  #5  
Nontypical Buck
 
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Default RE: Bare shaft testing and spine?

fletching them is only going to compound the problem. If you cant get a decent flight without them, I would try another shaft and save yourself the headache.
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Old 12-31-2002, 05:58 PM
  #6  
Giant Nontypical
 
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Default RE: Bare shaft testing and spine?

I've really never been much of a believer in paper testing for recurves, certainly not for longbows. When I bareshaft tune, I simply pay attention to how straight the shaft flies and sticks into the target. Straight flight is generally no problem to get out to 30 yards with the right spine. When my bare shafts hit right in the group with my fletched shafts, I'm in business.
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Old 01-01-2003, 12:32 AM
  #7  
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Default RE: Bare shaft testing and spine?

Adding mass weight over the length of the shaft w/out effectively stiffening the static spine and/or adding point weight will always decrease dynamic spine, while adding feathers and/or other weight/drag to the nock end will increase it.

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Old 01-03-2003, 10:32 AM
  #8  
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Default RE: Bare shaft testing and spine?

<BLOCKQUOTE id=quote<font size=1 face='Verdana, Arial, Helvetica' id=quote>quote:<hr height=1 noshade id=quote>
Adding mass weight over the length of the shaft w/out effectively stiffening the static spine and/or adding point weight will always decrease dynamic spine, while adding feathers and/or other weight/drag to the nock end will increase it.

HAPPY NEW YEAR!!!
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face='Verdana, Arial, Helvetica' size=2 id=quote>

Hey Vic,

Happy New Year!! Drop me an e-mail at [email protected]

Bill

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Old 01-05-2003, 11:11 AM
  #9  
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Default RE: Bare shaft testing and spine?

Here's OLAdcock's web site on bare shaft tuning.
Tuning Tips

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