Good article, and kind of what I was trying to get at. At a certain point KE is just as good of an indicator of penetration as momentum is.

But also note while his tests compare arrow weight and velocity, that arrow diameter & differing material is not used as testing factor (all tests were done with "22XX" alums).

Easton did a ton of testing for the AXIS using equal weights vs. diameter (and I would have to think since they are the #1 sellers of alum arrows and I also believe Carbons, they would be loathe to skew their own testing in favor of one or the other shaft material). But it would be interesting to see an equal diameter, equal weight, different material test too.

I'd like to see Norb do an updated test using all these other criteria (diameter, material type) as well.