What arrow mass will achieve tha maximum momentum?
05-15-2008, 10:44 PM
#21
Thread Starter
Join Date: May 2008
Location: Saint Paul, MN
Posts: 807
RE: What arrow mass will achieve tha maximum momentum?
ORIGINAL: bigbulls
Not trying to argue here but if you can get 300fps with a 560 grain arrow with an 82nd at 73 pounds I will drive to your house and kiss your rear end.
A 560 grain arrow should be clocking at about 280ish with a 30 inch draw and 73 pounds.
A 480 - 490 grain arrow will be hovering around the 300fps mark.
Not trying to argue here but if you can get 300fps with a 560 grain arrow with an 82nd at 73 pounds I will drive to your house and kiss your rear end.
A 560 grain arrow should be clocking at about 280ish with a 30 inch draw and 73 pounds.
A 480 - 490 grain arrow will be hovering around the 300fps mark.
05-15-2008, 10:49 PM
#22
Thread Starter
Join Date: May 2008
Location: Saint Paul, MN
Posts: 807
RE: What arrow mass will achieve tha maximum momentum?
ORIGINAL: MeanV2
My 60# 28" draw 82nd produces more KE with a 400 grain arrow than it does a 500 grain arrow. That was computed from actual performance not some software
Dan
My 60# 28" draw 82nd produces more KE with a 400 grain arrow than it does a 500 grain arrow. That was computed from actual performance not some software
Dan
05-15-2008, 10:53 PM
#23
Thread Starter
Join Date: May 2008
Location: Saint Paul, MN
Posts: 807
RE: What arrow mass will achieve tha maximum momentum?
ORIGINAL: TFOX
I have found Archers Advantage to be more accurate than ot2 and it says 291 BUT,bowtech gives the ibo from 342 to 350 and I believe AA uses the top end.If the bow only hits the low end,that puts it at or around 283 fps.
That should get it done regardless.
I have found Archers Advantage to be more accurate than ot2 and it says 291 BUT,bowtech gives the ibo from 342 to 350 and I believe AA uses the top end.If the bow only hits the low end,that puts it at or around 283 fps.
That should get it done regardless.
05-15-2008, 10:56 PM
#24
Thread Starter
Join Date: May 2008
Location: Saint Paul, MN
Posts: 807
RE: What arrow mass will achieve tha maximum momentum?
ORIGINAL: OHbowhntr
I'm just saying what OT2 quoted it as an "expected" speed. I thought it seemed a little FAST as well, but that I believe is the downside of OT2, I'm not 100% sure all of their calculations are correct. It puts my Trykon XL at 286fps as I have it set-up, but I've only gotten as fast as 276-277 blowing through a chrono. So I'm sure that's a HIGH guestimation. But even at 280, that's SMOKING for a LOG!!!!
ORIGINAL: bigbulls
Not trying to argue here but if you can get 300fps with a 560 grain arrow with an 82nd at 73 pounds I will drive to your house and kiss your rear end.
A 560 grain arrow should be clocking at about 280ish with a 30 inch draw and 73 pounds.
A 480 - 490 grain arrow will be hovering around the 300fps mark.
Not trying to argue here but if you can get 300fps with a 560 grain arrow with an 82nd at 73 pounds I will drive to your house and kiss your rear end.
A 560 grain arrow should be clocking at about 280ish with a 30 inch draw and 73 pounds.
A 480 - 490 grain arrow will be hovering around the 300fps mark.
05-16-2008, 06:55 AM
#25
Nontypical Buck
Join Date: Jan 2005
Location: Upstate New York
Posts: 2,435
RE: What arrow mass will achieve tha maximum momentum?
Going to a heavier arrow ALWAYS results in an increase in both momentum and kinetic energy. The reason for this is that,upon release,stored potential energy in the limbs is transferred more efficiently to the kinetic energy of arrows of greater mass than of lower mass. That's just fundamental mechanics and the rule can't be violated.
Sometimes, especialywhen the increase in arrow mass is small and/or measurement equipment/setupin testing is not precise,one can obtain results that SEEM to go against the physics. The reality is simply that measurement noise is larger than the effect of the change in mass.
In short, if you are trying to maximize ke/momentum there is no optimum arrow weight. Heavier is always better. However, as some have pointed out, the heavier the arrow the lower the velocity and hence there's the rub. As you gain in penetration potential you lose in trajectory so this is the tradeoff you have to accept.
Sometimes, especialywhen the increase in arrow mass is small and/or measurement equipment/setupin testing is not precise,one can obtain results that SEEM to go against the physics. The reality is simply that measurement noise is larger than the effect of the change in mass.
In short, if you are trying to maximize ke/momentum there is no optimum arrow weight. Heavier is always better. However, as some have pointed out, the heavier the arrow the lower the velocity and hence there's the rub. As you gain in penetration potential you lose in trajectory so this is the tradeoff you have to accept.
05-16-2008, 07:49 AM
#26
Thread Starter
Join Date: May 2008
Location: Saint Paul, MN
Posts: 807
RE: What arrow mass will achieve tha maximum momentum?
ORIGINAL: Sylvan
Going to a heavier arrow ALWAYS results in an increase in both momentum and kinetic energy. The reason for this is that, upon release, stored potential energy in the limbs is transferred more efficiently to the kinetic energy of arrows of greater mass than of lower mass. That's just fundamental mechanics and the rule can't be violated.
Sometimes, especialy when the increase in arrow mass is small and/or measurement equipment/setup in testing is not precise, one can obtain results that SEEM to go against the physics. The reality is simply that measurement noise is larger than the effect of the change in mass.
In short, if you are trying to maximize ke/momentum there is no optimum arrow weight. Heavier is always better. However, as some have pointed out, the heavier the arrow the lower the velocity and hence there's the rub. As you gain in penetration potential you lose in trajectory so this is the tradeoff you have to accept.
Going to a heavier arrow ALWAYS results in an increase in both momentum and kinetic energy. The reason for this is that, upon release, stored potential energy in the limbs is transferred more efficiently to the kinetic energy of arrows of greater mass than of lower mass. That's just fundamental mechanics and the rule can't be violated.
Sometimes, especialy when the increase in arrow mass is small and/or measurement equipment/setup in testing is not precise, one can obtain results that SEEM to go against the physics. The reality is simply that measurement noise is larger than the effect of the change in mass.
In short, if you are trying to maximize ke/momentum there is no optimum arrow weight. Heavier is always better. However, as some have pointed out, the heavier the arrow the lower the velocity and hence there's the rub. As you gain in penetration potential you lose in trajectory so this is the tradeoff you have to accept.
05-16-2008, 08:02 AM
#27
Boone & Crockett
Join Date: Feb 2003
Posts: 10,679
RE: What arrow mass will achieve tha maximum momentum?
I pulled an 82nd off the rack.The 29" module is installedand pulled 72.5 pounds. Add about 10-12 fps for another inch of draw length and you can get a pretty good idea what it will do.
It was shot through an Easton professional chronograph.
443 grain arrow...302 fps
502 grain arrow...283 fps
625 graub arrow... 256 fps
It was shot through an Easton professional chronograph.
443 grain arrow...302 fps
502 grain arrow...283 fps
625 graub arrow... 256 fps
05-16-2008, 08:16 AM
#28
Thread Starter
Join Date: May 2008
Location: Saint Paul, MN
Posts: 807
RE: What arrow mass will achieve tha maximum momentum?
ORIGINAL: bigbulls
I pulled an 82nd off the rack. The 29" module is installed and pulled 72.5 pounds. Add about 10-12 fps for another inch of draw length and you can get a pretty good idea what it will do.
It was shot through an Easton professional chronograph.
443 grain arrow... 302 fps
502 grain arrow... 283 fps
625 graub arrow... 256 fps
I pulled an 82nd off the rack. The 29" module is installed and pulled 72.5 pounds. Add about 10-12 fps for another inch of draw length and you can get a pretty good idea what it will do.
It was shot through an Easton professional chronograph.
443 grain arrow... 302 fps
502 grain arrow... 283 fps
625 graub arrow... 256 fps
05-16-2008, 10:10 AM
#29
Giant Nontypical
Join Date: Jun 2007
Location:
Posts: 7,367
RE: What arrow mass will achieve tha maximum momentum?
ORIGINAL: Sylvan
Going to a heavier arrow ALWAYS results in an increase in both momentum and kinetic energy.
Going to a heavier arrow ALWAYS results in an increase in both momentum and kinetic energy.
You know what they say about ALWAYS![8D]
My 82 actually picked KE going from a 500 grain arrow to a 400 grain arrow.
I know what you are saying is usually true, but the gain is small in comparison to speed lost.
Definitely Not Always though!
Dan
05-16-2008, 12:15 PM
#30
Nontypical Buck
Join Date: Jan 2005
Location: Upstate New York
Posts: 2,435
RE: What arrow mass will achieve tha maximum momentum?
You know what they say about ALWAYS![8D]
Have a great day!