PotashRLS Posted September 2, 2009 Report Share Posted September 2, 2009 This should make great reading for all the bowhunters gearing up for the upcoming archery seasons. A lot of threads go around annually about arrow/broadhead penetration, kenetic energy and light vs. heavy arrows. This is some technical reading but you will come away with the scientific answer to many questions. I hope you all enjoy it. Oh and have a calculator handy too! http://rds.yahoo.com/_ylt=A0LEVIYrxZ1KtfoAbRIPxQt.;_ylu=X3oDMTExN3Y1YzI1BHNlYwNzcgRwb3MDMQRjb2xvA3JlNAR2dGlkAwRsA1dTMQ--/SIG=13nf73lie/EXP=1251940011/**http%3A//www.tradgang.com/ashby/Momentum%2520Kinetic%2520Energy%2520and%2520Arrow%2520Penetration.htm Quote Link to comment Share on other sites More sharing options...
stcif Posted September 2, 2009 Report Share Posted September 2, 2009 Read it along with other Ashby reports. Good stuff. I notice the penetration just on my foam targets. Quote Link to comment Share on other sites More sharing options...
PotashRLS Posted September 25, 2009 Author Report Share Posted September 25, 2009 Bump for those who didn't read it. Quote Link to comment Share on other sites More sharing options...
layin on the smackdown Posted September 25, 2009 Report Share Posted September 25, 2009 It said i could READ IT AT MY OWN RISK...something about the file not being secured or something....didn't feel like possibly crashing the computer today. I tried though. Quote Link to comment Share on other sites More sharing options...
PotashRLS Posted September 25, 2009 Author Report Share Posted September 25, 2009 Try this.............. http://tradgang.com/ashby/Momentum%20Kinetic%20Energy%20and%20Arrow%20Penetration.htm Quote Link to comment Share on other sites More sharing options...
redkneck Posted September 25, 2009 Report Share Posted September 25, 2009 Tracy your killin me! I can't read all that. You should summarize it in like a hundred words or less! :clown: Quote Link to comment Share on other sites More sharing options...
redkneck Posted September 25, 2009 Report Share Posted September 25, 2009 Here's another link with a calculator: http://www.dewclawarchery.com/Kinetic_Energy_Calculator-a/157.htm Quote Link to comment Share on other sites More sharing options...
PotashRLS Posted September 25, 2009 Author Report Share Posted September 25, 2009 Here's another link with a calculator: http://www.dewclawarchery.com/Kinetic_Energy_Calculator-a/157.htm Yes that works for KE but doesn't elaborate on Momentum. Try this link if the others don't work. http://www.booneman.com/_terminalarrow.php Quote Link to comment Share on other sites More sharing options...
hdhiii Posted September 25, 2009 Report Share Posted September 25, 2009 Thanks for the info, but it may take me a hunting season to read and understand. I'll tackle it once February roles around. Quote Link to comment Share on other sites More sharing options...
Tink Posted September 26, 2009 Report Share Posted September 26, 2009 Just saw the penetration test Slick tricks VS Rage 2 Blade in plywood On you tube Slick trick won 2 blade Rage failed to penetrate at all TINK Quote Link to comment Share on other sites More sharing options...
hoosierhunter Posted September 26, 2009 Report Share Posted September 26, 2009 Great article.....Just give it a change b/c it's a little wordy.... Here's my Kenetic Energy... 11.3 GPI arrow at 28.25 inches...100gr broadhead and 12 gr knock.... 431.225/2=215.6125x276fps= 59,509.05x276=16,424,497.8/225218= 72.927 kenetic energy(foot lbs) I thought about switching to this before I got this data.... 8.3 gpi arrow...us 346.475/2=173.2375x292=50585.35x292= 14,770922.2/225218= 65.584 Kenetic Energy(foot lbs) So here's the ultimate question that everyone must answer. For me is 16 FPS worth losing 7.4 foot lbs of energy? another thing that needs to be noted is that my arrow drop is the same with both arrows in 10 yard increments. So the drop from my heavy arrow from 20-30 is the same for the lighter arrow from 30-40....The lighter arrow gains me 5 extra yards before drop from 20 to 25. Simple answer I'm not switching.... Also great notes about expandable broadheads and failure rates and what it does to a arrow's energy on impact.... Quote Link to comment Share on other sites More sharing options...
hoosierhunter Posted September 26, 2009 Report Share Posted September 26, 2009 Yes that works for KE but doesn't elaborate on Momentum. Try this link if the others don't work. http://www.booneman.com/_terminalarrow.php maybe I read it incorrectly but it seemed to focus on factors outside KE in regards to arrow performance. I.E. why bow companies focus on KE instead of momentum and other factors because the true numbers show that lighter arrows have to fly so much faster to acheive the same results as a heavier arrow. Long story short it says that a lighter arrow actually hurts you when it comes to penetration as compared to a slightly heavier arrow out of the same bow.... Quote Link to comment Share on other sites More sharing options...
stcif Posted September 27, 2009 Report Share Posted September 27, 2009 If I am reading your post correctly Hoosier, you are shooting about a 430 grain arrow/broadhead at 276 fps. If that is so you have a kinetic pulse of about 1219. You need a minumum KP of 500 to penetrate a deer shoulder bone. (not kinetic energy). Penetration is more a factor of momentum which is affected by arrow mass more so than arrow speed. Dr. Ed Ashby's reports explain it way better than I can. You can find them at www.tradgang.com. I used to shoot a 415 grain arrow at about 250 fps. That gives a KP of 853. I now shoot a 590 grain arrow at about 210 fps. That is a KP of 1022. Thats about a 20% increase in penetration. I think the best setup for most whitetail hunting is a fast, heavy arrow. Like a 600 grain arrow at 250 fps. Many people don't consider that fast, but I do, and it will penetrate. Prepare your setup for worst case scenarios, not best case. I read that and now believe in it. Quote Link to comment Share on other sites More sharing options...
hoosierhunter Posted September 29, 2009 Report Share Posted September 29, 2009 bump guys that are bowhunting and all into speed really really need to read this article.... Quote Link to comment Share on other sites More sharing options...
hunterwebb Posted September 30, 2009 Report Share Posted September 30, 2009 speed kill slow get duck seen it time and time again Quote Link to comment Share on other sites More sharing options...
PotashRLS Posted September 30, 2009 Author Report Share Posted September 30, 2009 I think the best setup for most whitetail hunting is a fast, heavy arrow. Like a 600 grain arrow at 250 fps. Many people don't consider that fast, but I do, and it will penetrate. Prepare your setup for worst case scenarios, not best case. I read that and now believe in it. I whole-heartedly believe this!!!! I still shoot Aluminum Easton XX78 Super Slams. They are just under 30" long and weigh 550grs with the Grim Reaper Broadhead. I shoot them between 255 and 260fps on average. This setup clearly helped me harvest my bear this past week as my arrow went through the shoulder blade, shattered the spinal column and rested under the ribs on the other side. All this with an expandable which held together very well. Two blades were still intact and straight and one actually sheared off in the middle instead of bending. That blade was found inbetween two vertebraes. I am very please with the outcome. Quote Link to comment Share on other sites More sharing options...
arrow32 Posted September 30, 2009 Report Share Posted September 30, 2009 I skimmed the article it looks pretty good. Put it in favorites I'm going to come back to it when I have more time and really read it. Quote Link to comment Share on other sites More sharing options...
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