Arrow penetration on moving targets

Discussion in 'Archery' started by Rancid Crabtree, Apr 30, 2018.

  1. Rancid Crabtree

    Rancid Crabtree

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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.



    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?
     
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  2. michael marrs

    michael marrs

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    I guess, I have never given it any though , I never shoot moving game., (intentionally), and I would guess, penetration would only be influenced it the target were moving towards, or away from you, and that be miniscule, but again, heavy on the word guessing
     

  3. Luv2hunteup

    Luv2hunteup

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    Could the lack of penetration on a flying disc be due to its lack of its mass more so than the movement factor?

    Metallic rifle targets are made to move vs being stationary.
     
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  4. Joe Archer

    Joe Archer Staff Member Mods

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    I would say it is the physics involved. When the downward motion of (in this case) the rotating target exerts a force on the moving arrow - more friction is created. Also, the force of impact is essentially no longer perpendicular to the rotating target resulting in the loss of penetration similar to what you might expect if your bow was not tuned properly.
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  5. Hunters Edge

    Hunters Edge

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    I would say it does decrease penetration, but minimal. Foam discs are created to stop arrow and minimize penetration to begin with. It uses dense material and friction.

    In hunting unless hitting bone that will not break, the broadhead actually creates an opening through tissue to make way for the arrow, and has blood, fat as a lubricant which increases penetration. The foam disc has no lubricant and even a broadhead will not separate foam to create opening but closes against it with pressure and creats friction. Unless repeated shots in one area.

    Also the broadhead opening alone allows room for arrow to angle, with deers movement, not causing a binding of the arrows shaft and little to no resistance. In foam this also is eliminated and the arrow is binding along the arrows shaft with no lubricants (blood, fat/tallow).
     
  6. Joe Archer

    Joe Archer Staff Member Mods

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    Another words ... when a target is in motion at the time impact an additional (in this case) downward force or vector is applied to an arrow that would not be present with a stationary target.
    To give an extreme example, if you were fast enough you could completely knock an arrow off course with a karate type chop... or a downward vector being applied to a moving object.
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