Interesting thread, but confusing. People are arguing against things that weren't said, and points that weren't made. Lots of name calling for no reason, and plenty of derogatory comments to sour an otherwise good thread.

This arguement seems to come down to penetration, and penetration is very complex - much more so than just comparing K.E. and momentum. Certainly, penetration is affected by many other factors, like broadhead sharpness, broadhead design, arrow diameter, arrow speed, bow tune, arrow spine, distance, wind and probably several more factors. Isolating just one of these in a test, would be difficult. And although any test might give strong indication of a particular advantage for penetration, a lot of the evidence would be anecdotal and with less than good scientific control. Then, take into account that the ideal factors for penetration wil probably vary depending on whether you hit fluid flesh, hard bone, feathers, or thick hide and it gets even more confusing. The fact that so many penetration tests are in foam, concrete, steel barrels, and other materials that are so unlike live animals, throws another wrench into the fray.

I think Coug is smart to not worry about K.E.. I know that I don't. I do worry a bit about my arrows spine, it's FOC and the broadhead design. I worry a whole lot about my bow's tune, my arrow's tune and the sharpness of my broadhead. If I shot a very low poundage bow, I still wouldn't worry much about K.E.. I would then pay a bit more attention to momentum and getting real close to my quarry. Back in the 70's I shot an elk with a 45 lb draw recurve. It took about 5 jumps before it fell dead. It never occurred to my that I was under-bowed, or that I didn't have enough K.E. or that the shot was risky. In fact, at the time, I couldn't imagine that the elk had any chance of surving the shot. What has happened to change things so much since then? Personally, I think it's because hunters worry about speed, instead of other things that have more bearing on how well your broadhead flies.