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#3495088 - 12/10/13 09:15 PM Thin Diameter Arrows for Penetration?
UTGrad
14 Point


Registered: 12/01/07
Posts: 9678
Loc: Franklin, TN

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I don't understand how a thinner diameter arrow increases penetration. If the broadhead is cutting the wound channel, why would a thin diameter be any better than a standard diameter? Wouldn't it be the broadhead design and momentum of the arrow vs arrow shaft diameter?
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#3495151 - 12/10/13 09:34 PM Re: Thin Diameter Arrows for Penetration? [Re: UTGrad]
Mr.Bro
10 Point


Registered: 08/02/09
Posts: 2867
Loc: Hendersonville Tn.

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I think maybe its less drag.I do know for a fact.Six bucks over the last 8 or 9 years,some years i dont shoot one,all taken with Easton Axis arrow behind Muzzys and all have been complete pass throughs.
The most amazing was a quartering away shot.Entrance was in front of left hip.Arrow busted shoulder on right side and kept on going.Complete pass through.The long way.40 yards was as far as he made it.
Most of these were shot with a 60lb Mathews DXT,30 draw.Shooting 256 fps.
Im sold on small diameter arrows.
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#3495167 - 12/10/13 09:43 PM Re: Thin Diameter Arrows for Penetration? [Re: Mr.Bro]
Hoss
TnDeer Old Timer
8 Point


Registered: 02/14/00
Posts: 1467
Loc: Hendersonville , TN

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I think the advantage of small diameter versus large diameter is mostly theoretical on game. In a 3D target it makes a difference because the foam closes up behind entry point providing friction to the shaft as it enters. On game the weight, inertia and KE I think are bigger factors. Smaller shafts like MrBro's Axis are really good balance of weight/inertia/KE. It also helps when you can shoot lights out like MrBro.
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#3495193 - 12/10/13 09:59 PM Re: Thin Diameter Arrows for Penetration? [Re: Hoss]
Mr.Bro
10 Point


Registered: 08/02/09
Posts: 2867
Loc: Hendersonville Tn.

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 Originally Posted By: Hoss
I think the advantage of small diameter versus large diameter is mostly theoretical on game. In a 3D target it makes a difference because the foam closes up behind entry point providing friction to the shaft as it enters. On game the weight, inertia and KE I think are bigger factors. Smaller shafts like MrBro's Axis are really good balance of weight/inertia/KE. It also helps when you can shoot lights out like MrBro.


Thanks i needed a good laugh!!!!
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#3495255 - 12/10/13 11:07 PM Re: Thin Diameter Arrows for Penetration? [Re: Mr.Bro]
krazykarl_13
Spike


Registered: 07/26/09
Posts: 80
Loc: crossville

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I would imagine the thin diameter would have less surface area for resistance and less drag. I am not sure that they would be small enough to make a huge difference though. Physics has been a few years for me haha.
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#3495313 - 12/11/13 04:34 AM Re: Thin Diameter Arrows for Penetration? [Re: krazykarl_13]
deerhunter10
10 Point


Registered: 08/21/12
Posts: 3438
Loc: maury county tn

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My guess would be less drag. But I never have heard of someone switching to a smaller diameter just for more penetration. I think your broad head has more to do with it then the diameter of the arrow.
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#3495647 - 12/11/13 09:27 AM Re: Thin Diameter Arrows for Penetration? [Re: deerhunter10]
Engine2c
4 Point


Registered: 10/02/13
Posts: 131
Loc: West TN

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I don't know if they actually allow more penetration, never given it much thought. Less surface are does kind of make sense though. I shoot easton axis fmj's. Everything I have shot has been a complete pass through with the exception of one. It was a quartering away shot where I struck the opposite shoulder and I believe that would stop most any arrow.
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#3495656 - 12/11/13 09:34 AM Re: Thin Diameter Arrows for Penetration? [Re: deerhunter10]
TNDeerGuy
12 Point


Registered: 11/28/06
Posts: 6139
Loc: Old Hickory/Mt.Juliet, TN

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Looking at it from a physics standpoint there just has to be some difference. There definitely is a penetration difference when shooting at a target like a foam 3D target. Considering a hunting application and all things being equal, a thin diameter arrow will out penetrate a larger diameter arrow. Even though a broadhead is creating a cut channel for the arrow to pass thru, the shaft will still come in contact with tissue creating drag on the arrow, the larger arrow has more surface area so it has to have more drag, however I believe the amount of drag compared between the two will be very negligible. The type of surface of the arrow will have an effect as well, and may have a greater effect than the diameter itself—not all carbons are the same. A smaller diameter arrow also is less effected by atmospheric conditions than a larger arrow and that has been proven. I wish I had the time, money and equipment to find out exactly the difference between the two.
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#3496806 - 12/11/13 10:37 PM Re: Thin Diameter Arrows for Penetration? [Re: TNDeerGuy]
Hoss
TnDeer Old Timer
8 Point


Registered: 02/14/00
Posts: 1467
Loc: Hendersonville , TN

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I agree there is a difference theoretically. In practical application the differenceis so miniscule as to be immeasurable. The wound channel is opened by the broadhead and the contact with the shaft would be minimal, then couple that with the lubricity of the tissues and body fluids the difference would be of no consequence. If you want to increase penetration then look other places for it. You can impact your penetration in much larger measure by doing other things. Once you are down to shaft diameter as a factor in optimizing your penetration you are pretty much there.
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A mere shadow of the man I once was... Me!

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#3497279 - 12/12/13 09:28 AM Re: Thin Diameter Arrows for Penetration? [Re: Hoss]
DixieCrafter
4 Point


Registered: 10/03/12
Posts: 333
Loc: Mid-TN

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The theoretical concept of the smaller diameter shaft having greater penetration because of less frictional resistance along the shaft, following the broadhead inside the wound channel makes a lot of sense, and it's great marketing also! I have seen the ballistic gelatin tests and usually the Axis shafts does it deeper!

I've killed a bunch of critters with the Axis shaft since it came on the market several years ago! My APPLICATION with hunting with this heavier and smaller diameter hunting shaft has proven to me that it will out penetrate any other shaft I have hunted with! The Axis style shafts are some of the toughest on the market and as a bonus they really buck the wind great.

The next time you kill a deer try cutting the front shoulder off with the leg and hide attached and hang it up in front of a safe backstop. Aim right at that shoulder blade with your broadhead and shaft combo and evaluate yoyur results. Then give the Axis shaft a try!
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