Arrow penetration on moving targets

Stay Sharp

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Oct 6, 2015
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How much (if any) penetration is lost due to game movement at the time the arrow impacts the animal???? Deer and other game will dodge, duck, dip, dive and dodge in advance of and during the arrows impact. This has the effect of changing the path and direction of the arrow shaft. This game movement applies sidewards and bending forces to an arrow shaft the wants to travel in a singular direction. Doe it result in a reduction of penetration?

If you have seen aerial, foam disks being shot with an arrow you will notice that rarely will the arrow penetrate all the way through. Is this due to the movement of the target altering the arrows intended path? Likewise we have seen video footage of game animals making fantastic, twists and turns and drops as the arrow attempts to make its way through and stories of arrows changing directions and existing parts of game animals far from where we might expect to have exited based on the point of impact. In such cases, Its not uncommon for the animal to run off with the arrow. Was this dues to energy being stripped from the arrow via a direction change?

But just how much (if any) penetration is lost due to this sudden change in forces and direction to the flight path? Can it be measured? We hoped to put these questions to the test with a target meant to change an arrows direction during impact in an effort to measure the effects on penetration.

[video=youtube;IZIdaKc83nc]https://www.youtube.com/watch?v=IZIdaKc83nc[/video]

Apply what you have seen. Formulate a hypothesis. How much (if any) penetration is lost due to the change in direction? Penetration Measurements were taken on the stationary target and then again while the target was spinning in an attempt to capture results under these two parameters.

Was penetration reduced due to the spinning target (by what percent?)

Was penetration improved due to the spinning target (by what percent?)

Was penetration unaffected by the spinning target?
 

Bonecollector

Veteran member
Mar 9, 2014
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Ohio
Good question and am looking forward to the answer. In a hunting situation, I think the shots may not be as good due to 'pressure' and adrenaline of the shooter due to the situation which could result in bad shots and poor penetration. However, that's not what you asked. :)

The object in motion, arrow, loses some momentum of traveling on a straight path, with the exception of gravity, upon impact. I would think the further the distance, the greater the loss of momentum, or penetration.
 

Stay Sharp

Very Active Member
Oct 6, 2015
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Was penetration reduced due to the spinning target (by what percent?)

Was penetration improved due to the spinning target (by what percent?)

Was penetration unaffected by the spinning target?
 

CrimsonArrow

Very Active Member
Feb 21, 2011
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Minnesota
The greater the speed of the moving target, the greater amount of deflection, leading to less penetration. Unless you're talking about shooting at moving aircraft, the arrow's speed is many times greater than that of its potential target. My guess is loss of penetration will be minimal.
 

dirtclod Az.

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Jan 26, 2018
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Stay Sharp you have shot everything from Chipmunks to Brontosaurus with your bow.Of course penetration is slowed with motion of the animal.Just ask the last Godzilla you shot.Lol!:cool:
 

Stay Sharp

Very Active Member
Oct 6, 2015
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My first kill was a mouse with a bow in 1973. It was perhaps 1.5 Oz. Last month's Water Buffalo was 1,700 pounds. I DID NOT get a pass through on the mouse. It was slid up the arrow shaft about 5 inches.
 

dirtclod Az.

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Jan 26, 2018
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THE BROADHEADS YOU PRODUCE ARE MUCH LARGER THAN A CHURCHMOUSE.WOULD LIKE TO USE SOME TO KICKOFF MY BUCKETLIST.
AZ.BULL ELK.:cool:
 

Stay Sharp

Very Active Member
Oct 6, 2015
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I don't actually produce any broadheads for sale. All the broadheads I make are only used b me. If you are looking for a high quality/premium broadhead for elk, I can highly recommend Cutthroats and Iron Will. The steel used in them in top tier. The edge retention is fantastic.
 

Hilltop

Veteran member
Feb 25, 2014
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Eastern Nebraska
I'm curious to see your results. I do think you need to increase movement speed to reflect animal "string jump" speed to create a more real world test but I may be wrong. A good starting point would be 32fps (gravity). I do believe some animals are moving slightly faster than this when you consider muscle contraction as well at the string jump. Maybe for the next test...

As to my opinion? Animal movement absolutely changes penetration.
 

pbarheart

New Member
Feb 16, 2014
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0
Clancy,MT
The other reason for lack of penetration on throw targets is the lack of mass. Most of the time the arrow will "push" the target rather than penetrate.