As my name indicates, I enjoy archery (specifically bowhunting). I am in the process of determining the ideal weight (measured in grains) for a set of arrows that I am making. I want to have the heaviest arrow possible (i.e. for optimal momentum and penetration), but I want to still have requisite arrow velocity to achieve impact before the deer has an opportunity to move out of the arrow's path. Typically when a deer hears an unfamiliar noise (e.g. a bow being fired), it's natural reaction is to crouch (dropping low to the ground) and then spring forward and away from the noise--all in one fluid motion. I am trying to calculate the time that it takes for a deer to drop 2.5 inches. 2.5 inches represents the radius of a deer's vital zone. Let's assume that an average deer weighs 150lbs. Any ideas on how to come up with this calculation? I will be sure to share my full analysis with everyone after it is completed. Thanks in advance!