What is the best way to get kinetic energy
03-23-2005 | 07:29 AM
#41
Giant Nontypical
Joined: Aug 2003
Posts: 7,103
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From: The OH-IO
RE: What is the best way to get kinetic energy
i know the more K.E. u have can help those bad placed shots, but the reason u missed placed the arrow was because of draw wt. to high or you took a unethical shot because u have 80lbs. of K.E. WOW TOUGH GUY!!!
I have NEVER lost a deer, can you say the same TOUGH GUY?
03-23-2005 | 07:55 AM
#44
Nontypical Buck
Joined: Jan 2005
Posts: 2,435
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From: Upstate New York
RE: What is the best way to get kinetic energy
Arthur P wrote:
Arthur, I don't know why you use the word conveniently, it should be pretty clear from my post that I'm not playing momentum against KE or the reverse. Like I said, I think for all practicle puposes this is a silly argument to get into and it looks to me like you and I pretty much agree anyway yet I sense you don't think we do. If you like, I'll include momentum in my chart but as far as downrange numbers I said that heavier arrows have more punch at all ranges so I don't get what you seem to be trying to argue about.
BTW, just out of curiosity, why do you always use lb/sec for units of momentum. lb/sec are of course not units of momentum the correct unit would be slug ft/sec.
As far as the 400 grain arrow minimum, I would rather see a minimum on either KE or momentum. Say 35 ft/lbs KE minimum at 30 yards or if you prefer momentum then say 0.4 slug ft/sec at 30 yards minimum. A mass only requirement doesn't take velocity into account which of course both KE and momentum do.
I notice your chart conveniently omits momentum readings and downrange energy.
BTW, just out of curiosity, why do you always use lb/sec for units of momentum. lb/sec are of course not units of momentum the correct unit would be slug ft/sec.
As far as the 400 grain arrow minimum, I would rather see a minimum on either KE or momentum. Say 35 ft/lbs KE minimum at 30 yards or if you prefer momentum then say 0.4 slug ft/sec at 30 yards minimum. A mass only requirement doesn't take velocity into account which of course both KE and momentum do.
03-23-2005 | 08:05 AM
#45
Nontypical Buck
Joined: Feb 2003
Posts: 2,890
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From: WEST PALM FLORIDA
RE: What is the best way to get kinetic energy
Back a ways in this post, someone wrote that speed is more important. They are correct, because you multiply the speed by itself which increases its value A LOT.
This site is definitely having technical problems
03-23-2005 | 08:17 AM
#46
Nontypical Buck
Joined: Jan 2005
Posts: 2,435
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From: Upstate New York
RE: What is the best way to get kinetic energy
mainehunt wrote:
The problem with your logic is that if you have a bow that is shooting a 500 grain arrow at 200 ft/sec it will not shoot a 300 grain arrow at 320 ft/sec. it will only shoot it at 244.9 ft/sec which is a drop in KE of 4.4 ft/lbs.
ijimmy is on the money!
[Note: momentum added for Arthur P]
Let's consider an arrow that weighs 500 grains and flys at a speed of 200 FPS. You multiply 200 times 200 and get 40,000. You then multiply this times half the weight which is 250, and you get a VALUE of 10,000,000.
Now let's consider an arrow that weighs 300 grains, BUT flys 320 FPS. 320X320=102,400
Then multiply this 102,400 times half the weight (150) you get 15,360,000!
Now let's consider an arrow that weighs 300 grains, BUT flys 320 FPS. 320X320=102,400
Then multiply this 102,400 times half the weight (150) you get 15,360,000!
ijimmy is on the money!
[Note: momentum added for Arthur P]
03-23-2005 | 08:35 AM
#49
Nontypical Buck
Joined: Feb 2003
Posts: 2,890
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From: WEST PALM FLORIDA
RE: What is the best way to get kinetic energy
The problem with your logic is that if you have a bow that is shooting a 500 grain arrow at 200 ft/sec it will not shoot a 300 grain arrow at 320 ft/sec. it will only shoot it at 244.9 ft/sec which is a drop in KE of 4.4 ft/lbs.