Not all the increase in penetration potential will be due to momentum, but definitely the lion's share will be. Why? Because the percentage increase in KE is very small compared to the percentage increase in momentum.
That's quite a claim. Care to back it up with some calculations. How much is the lions share and how did you calculate it?
I think you just like to argue, Sylvan. I'm very tired of it so this is my last post on this thread. But I'll leave you with a few closing thoughts.
Why are bows more efficient with heavier arrows (within reason)? Or, to put it another way, why do heavier arrows come off the bow with more energy than light ones? Why do they retain their speed and energy better, downrange? What keeps arrows going in a given direction instead of letting rhem wander back and forth at random? What keeps them from bouncing off and deflecting onto an entirely different direction of flight when they hit the animal?
Why can a a heavy arrow shot from a relatively inefficient and/or low draw weight bow, with low KE and high momentum, penetrate every bit as well as an arrow with high KE and low momentum? I've been eagerly awaiting your input on that question for many days now! You've been very adroit at avoiding the issue. I know why, too. It's because you simply
can not explain it without acknowledging the pure fact that
momentum is a better indicator of penetration potential than KE is.
Period. End of discussion.