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?
Last edited by sharp_things; 04/30/18.
Member Wisconsin Bowhunters Assc, Wisconsin Traditional archers, Pope and Young, Asbhy 100,
Yes they do but if you watch any number of bowhunting deer videos you see deer and antelope and other critters move a lot during arrow flight and impact. They are moving (usually down and away) as they turn to flee the area.
Member Wisconsin Bowhunters Assc, Wisconsin Traditional archers, Pope and Young, Asbhy 100,
The spinning target was used as a constant medium to capture the effects of spining/dropping/moving game and then the results could be applied to live game.
Last edited by sharp_things; 05/03/18.
Member Wisconsin Bowhunters Assc, Wisconsin Traditional archers, Pope and Young, Asbhy 100,
The spinning target was used as a constant medium to capture the effects of spining/dropping/moving game and then the results could be applied to live game.
The impact energy of the arrow does not change if the target is stationary or moving. Friction forces on the arrow would be about the same too. Would really depend on the speed target is moving. If walking speed, 3 mph, or 4.5 fps, arrow deflection would be minimal, as the arrow is moving 320fps. Assuming a 2.5' long arrow, the entire arrow would penetrate (in a perfect world) in .008 seconds. In that same time it would only move laterally (due to the target moving) 0.04' or 0.5". Negligible at best.
If running speed, 30mph or 45fps. Lateral movement on the arrow would be .4' or 5". That might have some effect, but good luck at hitting an animal while it's cruising at 30mph...with a bow.
If I had to guess, and guess it is... If anything changes with a moving target, it's the shooter's point of aim changes after release and point of impact differs from the intended point, due to the animals moment. The actual hit location on the animal isn't ideal and penetration appears to suffer.
Even in your video, the slo-mo video shows the arrow has penetrated BEFORE the vibration is visible. Hard to say how fast the target is moving without knowing the drill RPM and radius of the impact point on the target, but it appears to be a lot faster than 3mph. In just about any realistic bow shot case, he arrow is moving VERY fast compared to the target. The videos you include also show the target moved before the impact, the animal jumped the string. Hence the variation from the intended impact point. It's not because the target moved during impact.
The impact energy of the arrow does not change if the target is stationary or moving. Friction forces on the arrow would be about the same too. Would really depend on the speed target is moving. If walking speed, 3 mph, or 4.5 fps, arrow deflection would be minimal, as the arrow is moving 320fps. Assuming a 2.5' long arrow, the entire arrow would penetrate (in a perfect world) in .008 seconds. In that same time it would only move laterally (due to the target moving) 0.04' or 0.5". Negligible at best.
If running speed, 30mph or 45fps. Lateral movement on the arrow would be .4' or 5". That might have some effect, but good luck at hitting an animal while it's cruising at 30mph...with a bow.
If I had to guess, and guess it is... If anything changes with a moving target, it's the shooter's point of aim changes after release and point of impact differs from the intended point, due to the animals moment. The actual hit location on the animal isn't ideal and penetration appears to suffer.
Interesting observations and thought process.
Member Wisconsin Bowhunters Assc, Wisconsin Traditional archers, Pope and Young, Asbhy 100,
The impact energy of the arrow does not change if the target is stationary or moving. Friction forces on the arrow would be about the same too. Would really depend on the speed target is moving. If walking speed, 3 mph, or 4.5 fps, arrow deflection would be minimal, as the arrow is moving 320fps. Assuming a 2.5' long arrow, the entire arrow would penetrate (in a perfect world) in .008 seconds. In that same time it would only move laterally (due to the target moving) 0.04' or 0.5". Negligible at best.
If running speed, 30mph or 45fps. Lateral movement on the arrow would be .4' or 5". That might have some effect, but good luck at hitting an animal while it's cruising at 30mph...with a bow.
If I had to guess, and guess it is... If anything changes with a moving target, it's the shooter's point of aim changes after release and point of impact differs from the intended point, due to the animals moment. The actual hit location on the animal isn't ideal and penetration appears to suffer.
Interesting observations and thought process.
Mountain10mm......I think you talked over his head. Lol
