RE: KE vs Momentum
If you want a lot of momentum without a complete pass thru use a 2514 arrow with a 125 grain head on it
if you want less momentum with a complete pass thru use a speed pro max with a 55 grain head on it.
the point I am trying to make is that you Can have an arrow that carries a lot of momentum but if it has a weak spine the arrow will stop dead because of all the flexing it it does and the friction it produces on impact of its target.
while a arrow with less momentum and a stiffer spine and smallet diamiter will penetrate deeper because momentum is lot lost due to flexing of the shaft .
other thing to consider that the cut diamiter the head produces will allow a smaller diamiter arrow to pass thru much more easily opposed to a larger diamiter shaft.
all this momentum and KE equations work good on paper. but the proof is in testing the arrows aginst each other.
doing a side by side compairison of different brands of arrows you will be shocked to find what actually out penetrates another brand.
just because you shoot a heavy arrow does not always mean you are shooting the most energy efficient arrow.