Ok - Here's another performance calc to add to the equation...
Arrow shaft thickness/circumference vs. head shaft thickness.
I shoot a CX 300 with my broadhead. For kicks, I mounted my broad head to a buddy’s Easton carbon that had a thinner thickness/circumference than my CX.
Both were identical except for shaft thickness. When shot into a HD foam target, the thinner shaft had far superior penetration (excess or 50%).
The CX shaft matched the thickness of the broadhead, the Easton was thinner. Did the CX's shaft add to the friction or drag coefficient - thereby not achieving as great of penetration? Did the Easton have greater penetration because there was less drag on the shaft?
Just some thoughts...
Then again what does a HD foam target have to do with real life penetration? Who knows... Makes me think that the next time I might invest in some smaller diameter shafts when I buy my next batch of arrows (everything else being equal).
"It's not the kill, it's the adventure and challenge! <img src=icon_smile_big.gif border=0 align=middle>"