HuntingNet.com Forums - View Single Post - To heck with KE formulas and theories

04-07-2005 | 09:08 PM

#107

Len in Maryland

Joined: Feb 2003

Posts: 1,385

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From: Baltimore Maryland USA

RE: To heck with KE formulas and theories

Quoted from Dr. Ashby by others:
"As I point out in the article, not all momentum is equal! Momentum gained from increasing arrow mass [ie. heavier arrow] results in more penetration than momentum gained through increased arrow velocity [ie. speed]. The data here is clear cut [ie. more momentum with a heavier arrow]. The reason is because the increased tissue resistance encountered by the faster arrow (assuming both arrows have equal impact momentum) reduces the time over which the available momentum is disipated in the tissues: the lighter arrow will have a lower Impulse of Force - regardless of the distance of the shot."

The tricky part here is where he says "....(assuming both arrows have equal impact momentum)...." Because, in the first sentence he states "....not all momentum is equal!"

While this paragraph is just a slight indication of his complete work, it is a glimpse of reality as best it can be defined via forums. A breakdown of the paragraph results in some specifics to which Sylvan has agreed/argued from the beginning.

It's the indepth understanding of the parameters of testing that is not inclusive in forum interaction. The vector query is just one example of confusion.

I'm surprised and delighted that Sylvan carried this as far as he did; and, I thank him again for both the content and his perseverance.

BTW, KE usage as a measuring term became popular with the advent of mechanical broadhead usage. The industry needed to gauge usage due to problematic issues with misuse of the earlier mechanicals. The 'goat' was KE.

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