Well here's what I came up with using 2 very different arrow weights. Both arrows fly true out of my bow. I want to do this with a better medium say 1/4" mds with a foot of foam behind it. This should give greater penetration which would give better numbers to work with. As it is it looks to me that penetration follows momentum pretty close. The 430 gr arrow is no slouch though. Just happens that the 708 gr @ 160 matches my mental computer.
I should mention that the 430 gr arrow had a sharp magnus 100 gr 2 blade broadhead and the 708 gr arrow had a sharp 250gr grizzly.
- Weight 708 gr 160 fps 40.26 KE .503 Mo
Weight 430 gr 204 fps 39.75 KE .390 MO
[/list]
- KE increase 708 vs 430 = 1.27%
MO increase 708 vs 430 = 22.56%
[/list]
Phone book = 1 3/8"
- 708 gr = 4.0625" penetration = 300%
430 gr = 3.125" penetration = 227.3%
Penetration 708 vs 430 = 23.08% increase
[/list]