Not a bad site, their angle calculator is wrong though. Sent from my iPhone using Bowhunting.com Forums
You go heavy until the drop becomes to much. Equation per drop. .5*32.2*12*(X*3/V)^2/2 X= distance yards V = speed Feet per second Calculates the drop in inches It is a little more complicated since the arrow starts on an up angle. Sent from my iPhone using Bowhunting.com Forums
There is also frictional loss...but seeing as both those are constants in any scenario they can be ruled out for the sake of determining drop.