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Does Kinetic Energy = Penetration?

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Old 08-27-2002 | 11:38 AM
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Default RE: Does Kinetic Energy = Penetration?

Well, HuntingBry, I was hoping to get a rise out of TFOX and BobCo before I admitted it, but after shooting these Easton Epics for the past couple of weeks, getting tuned in and getting used to them, I'm shooting better than I did with the aluminums. I am dropping down from heavyweight arrows to what I consider high middleweight (cruiserweight maybe?), 470 grains for just under 8 grains per pound of draw weight.
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Old 08-27-2002 | 12:34 PM
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Default RE: Does Kinetic Energy = Penetration?

As Dr Ashby's broadhead penetration tests on African game showed, neither KE nor momentum can be used directly to predict penetration by a given arrow, it is only a magnitude indicator of POTENTIAL penetration capability(i.e. all else being equal, the more you have of either the more penetration you can generally expect).

Even in game Ashby showed there was a signifcant relation between the size of the broadhead ferrule and the arrow shaft(larger ferrule then shaft size increased) and the broadhead type(cut on impact etc).

Shot selection, stability of the arrow on impact(tune), broadhead failure etc all play important parts in penetration.
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Old 08-27-2002 | 12:46 PM
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Wow Arthur what's going on? You were one of the last on the log throwing bandwagon!<img src=icon_smile_shock.gif border=0 align=middle><img src=icon_smile_shock.gif border=0 align=middle>.

No seriously, you have to do what works for you. No arguement there. Like I said, I have used carbons on and off for years, but always go back to the Aluminums. Last night I was practicing with them and had some great groups going with my 700 grain logs including broadheads. So I'll stick with them for another year.

Like I said though probably next year, I'll give the carbon tech rhino's a chance. But I don't look forward to pulling them out of 3-d targets.

And Arthur, what's this mechanical broadhead thing going on???!!!!
<img src=icon_smile_shock.gif border=0 align=middle><img src=icon_smile_shock.gif border=0 align=middle> Are you going to get the pretty pink fletchings next???<img src=icon_smile_tongue.gif border=0 align=middle>

Seriously again, I know that mechanicals will kill, never argued that point. I used them one year like I've said and they were not for me. I'm the kind that gets phyched filing and honing my magnus broadheads the night before the hunt. <img src=icon_smile_evil.gif border=0 align=middle> Especially a traditional hunt.

Let us know what you kill this season!

P.S. I never meant to sound like I was ever against carbons or mechanicals. Sometimes, though, I feel like I have to defend my position on why I don't use carbons, why I choose to use aluminums, why I use fixed bladed cut on contact heads, or why I choose heavy arrows over light. I hope everyone does well, whatever their setup is.

Edited by - BobCo19-65 on 08/27/2002 13:58:41

Edited by - BobCo19-65 on 08/27/2002 13:59:53
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Old 08-27-2002 | 01:01 PM
  #204  
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Default RE: Does Kinetic Energy = Penetration?

Yep, and I see where Gateway has a new Tre Purple feather that would be absolutely fabulous as a cock feather. Perfect to really bring out the color in the pink hen feathers. <img src=icon_smile_wink.gif border=0 align=middle>

Actually, some folks think 470 grains is right up their with lobbing anvils, so my reputation is still intact. Rest assured that I'll sit down on the eve of opening day with a handful of Magnus heads and hone them to perfection. Some pre-hunt rituals are not to be ignored.
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Old 08-27-2002 | 01:14 PM
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Default RE: Does Kinetic Energy = Penetration?

Arthur ..<img src=icon_smile_shock.gif border=0 align=middle><img src=icon_smile_shock.gif border=0 align=middle><img src=icon_smile_shock.gif border=0 align=middle><img src=icon_smile_shock.gif border=0 align=middle><img src=icon_smile_shock.gif border=0 align=middle><img src=icon_smile_shock.gif border=0 align=middle>

Now, here is a question

Do you think your trajectory has changed enough for it to be a benefit to hunting?

And....How long until your hunting with a BK2 at 32&quot; draw 5 grns per pound shooting about 360 fps? <img src=icon_smile_tongue.gif border=0 align=middle><img src=icon_smile_big.gif border=0 align=middle>
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Old 08-27-2002 | 01:15 PM
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Default RE: Does Kinetic Energy = Penetration?

I shouldn't poke too much fun at the pink fletches, my buddy just ordered a dozen arrows from me with a hot pink cock and white hens. Maybe it's my feminine side showing, but they actualy came out looking pretty good to me.

OK enough of that!<img src=icon_smile_dead.gif border=0 align=middle><img src=icon_smile_dead.gif border=0 align=middle>
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Old 08-27-2002 | 01:45 PM
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Default RE: Does Kinetic Energy = Penetration?

Rackattack... No, the trajectory hasn't changed enough to benefit my hunting, since I have a self imposed limit of 30 yards. But it does help on the longer stakes on the 3D range. The reason I decided to go this direction is how much my groups tightened up with these arrows and how much better my one shot accuracy is. Better accuracy = better shot placement. Frankly, I'm astounded that any all carbon arrow shoots more accurately than a good aluminum, but it's happening.

I've already dropped my arrow weight by 22%, from 10 grains per pound to 7.8! What more do you want?

I'll probably wind up shooting a BK2 after going to the vet and getting my bow arm shortened by an inch or two. And I'll start shooting 5 grains per pound @ 360 fps along about the same time. Wow! The very thought of shooting a 350 grain arrow at just over 100 ft lbs of energy scares the snot out of me! Besides, if I go to 8 grains per pound (560 grains), slow the arrow speed down to around 318 fps, my KE will go up to nearly 126 ft lbs.<img src=icon_smile_evil.gif border=0 align=middle>

BobCo, at the risk of telling on myself, I've shot pink vanes before. Not only pink, but flourescent pink. I never lost a single arrow in the grass with that color.
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Old 08-27-2002 | 03:08 PM
  #208  
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Default RE: Does Kinetic Energy = Penetration?

<BLOCKQUOTE id=quote<font size=1 face='Verdana, Arial, Helvetica' id=quote>quote:<hr height=1 noshade id=quote> But if A^2 + B^2 = C^2, how long would it take a monkey with a wooden leg to kick all the seeds out of a watermelon?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face='Verdana, Arial, Helvetica' size=2 id=quote>

<img src=icon_smile_big.gif border=0 align=middle>lmao



Protect your hunting rights, &quot;Spay or neuter a liberal.&quot;
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Old 08-28-2002 | 01:50 AM
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Default RE: Does Kinetic Energy = Penetration?

Straight arrow. The needle would not have enough strength to penetrate at slow speeds (velocity is the key)

Perhaps I had a typo...the ping pong ball will accelerate as fast as the bowling ball, but due to it's lower average specific gravity it will reach it's V-max much faster (it will have a lower v-max) Now....as far as which falls faster a marble or a feather...the marble does....in an atmosphere...in a vacuum (lack of atmosphere) the feather will fall exactly as fast as the marble.
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Old 08-28-2002 | 06:52 AM
  #210  
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Default RE: Does Kinetic Energy = Penetration?

Arthur, I wouldn't say you're flinging logs now, but you still have almost 100 grains on me. Then again you have almost an extra 6 inches of arrow as well.

Stealth, I have seen that marble/feather trick in one of my high school classes. Too bad there's no deer on the moon, we could shoot them from 80 yards and not worry about penetration.<img src=icon_smile_wink.gif border=0 align=middle>
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