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?