Arrow penetration vs. weight
05-19-2007, 09:02 PM
#11
Giant Nontypical
Join Date: Feb 2003
Location: HENDERSON KY USA
Posts: 6,634
RE: Arrow penetration vs. weight
ORIGINAL: bow_hunter44
Yup TFOX, that is right (at least to the best of my understanding, and besides that you are always right!!). As velocity increses the frictional force, in fact,decreases.
Yup TFOX, that is right (at least to the best of my understanding, and besides that you are always right!!). As velocity increses the frictional force, in fact,decreases.
I wish that were true.
05-20-2007, 11:00 AM
#15
Nontypical Buck
Join Date: Feb 2007
Location: Balt, MD (orig: J-town,PA) The bowels of Hell!!!
Posts: 2,188
RE: Arrow penetration vs. weight
When I saw this post I started laughing my a$$ off. This post is eerily familiar to me..
To test penetration basedonly onweight youhave to have the same diameter shaft and spine the same for all the arrows. If not the thinner shaft will more than likely out penetrate the thicker shaft every time. In addition, the arrow with the higher spine will loosevelocityslower. The more "flimsy" arrow will oscillate more upon contact with the media increasing the side friction on the shaft due to the bending of the shaft.
Am I explaining that right bow_hunter44?
I found that out with the experiment I did for the "Physics is Fun" Thread.
If you wanted to test for penetration based on diameter than you would need the same weight and spine for each shaft.
There are a lot of variables that you have to take in to account based on the test you are trying to conduct.
To test penetration basedonly onweight youhave to have the same diameter shaft and spine the same for all the arrows. If not the thinner shaft will more than likely out penetrate the thicker shaft every time. In addition, the arrow with the higher spine will loosevelocityslower. The more "flimsy" arrow will oscillate more upon contact with the media increasing the side friction on the shaft due to the bending of the shaft.
Am I explaining that right bow_hunter44?
I found that out with the experiment I did for the "Physics is Fun" Thread.
If you wanted to test for penetration based on diameter than you would need the same weight and spine for each shaft.
There are a lot of variables that you have to take in to account based on the test you are trying to conduct.
05-20-2007, 07:47 PM
#16
Fork Horn
Join Date: Feb 2007
Location: Idaho
Posts: 384
RE: Arrow penetration vs. weight
That is true Dave, increaded oscillation will increase friction. Not only that, but a 'flimsy' shaft will loose momentum upon impact due to theoscillation of the shaft. That momentum would be much better spent following, or perhaps even driving,the broadhead into the target. Needless to say, the topic of penetration is far from a remedial one!
When I first read the topic of this thread I almost ran, ran screaming into the night!!
When I first read the topic of this thread I almost ran, ran screaming into the night!!
05-20-2007, 08:37 PM
#17
Join Date: Feb 2003
Location: Baltimore Maryland USA
Posts: 1,385
RE: Arrow penetration vs. weight
The straighter an arrow comes off the rest and/or the sooner it straightens out, the less chance of it adversely affecting penetration.
As Bowhunter 44 stated:
Also, said in a different way, the oscillation/porpoising/minowing or any mode of travel from point 'A' to point 'B' in anything other than a straight line will affect momentum/penetration.
As Bowhunter 44 stated:
That momentum would be much better spent following, or perhaps even driving,the broadhead into the target.
Also, said in a different way, the oscillation/porpoising/minowing or any mode of travel from point 'A' to point 'B' in anything other than a straight line will affect momentum/penetration.
05-21-2007, 04:51 AM
#18
Nontypical Buck
Join Date: Feb 2007
Location: Balt, MD (orig: J-town,PA) The bowels of Hell!!!
Posts: 2,188
RE: Arrow penetration vs. weight
ORIGINAL: bow_hunter44
When I first read the topic of this thread I almost ran, ran screaming into the night!!
When I first read the topic of this thread I almost ran, ran screaming into the night!!
I bet you did.
Every test that's performed on arrow performance (or any test for that matter)musttry to have only 1 variable and keep everything else as a contant when comparing items. Introduce too many variables and the test is not valid or the outcome is skewed.
05-21-2007, 07:14 AM
#20
Nontypical Buck
Join Date: Feb 2003
Location: WEST PALM FLORIDA
Posts: 2,890
RE: Arrow penetration vs. weight
I agree with Len , a better test would have been to shoot the beman into a target , measure , put weedwhacker line in the shaft , or weigt tube , and shoot the same shaft and head into the same target and remeasure .