Just an obervation from someone whom pays keen attention to engineering/test methodologies in effort to define true performance capacity.....the test methodology used in a somewhat scientific appearing effort skewed greatly the actual, factual results thus provide less than scientific conclusions. The appearance of improved performance was achieved simply due to larger drag surfaces amplifying the simple fact that deceleration occurs at an exponentially faster rate the farther you get from the bow in comparison to smaller drag surfaces shot at the same initial velocity. The gentleman should have made vane/feather choices which were all more uniform in basic size/surface area...then...you can differentiate the materials differeing performance capabilities more accurately....and learn something factual besides basic projectile deceleration facts...and there is yet more mathmatical effort to reduce even the variation between those more closely matched vanes/feathers for obtaining even more accurate resultant data.... Just sayin...
