How heavy do you go on arrow weight.....etc...

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Re: How heavy do you go on arrow weight.....etc...

Postby Jason on Mon Aug 31, 2009 2:03 pm

Greg, Why do you think WA has that law? I can see legislating a minimum weight for an arrow to promote downrange KE but I'm not sure I understand tieing the grains to the draw weight? For example my bow shooting a 385 grain arrow at 70 lbs has more KE than a 63 lb bow shooting that same weight arrow. In WA my set up would be illegal though, while the 63 lb setup would be fine?

Seems that as far as KE and killing power is concerned, the opposite should be true. A lighter draw weight bow should be required to shoot a heavier arrow. I'm the first to admit I have no clue how to calculate KE but I would think my logic makes sense.
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Re: How heavy do you go on arrow weight.....etc...

Postby Coodster on Mon Aug 31, 2009 3:29 pm

Nut, bow must be able to cast a 400gr arrow some 300 or 160 yards or something like that 40# min for deer, 50# min for elk, basically you adjust your elevation to reach the yards stated in the regs :mrgreen:
I was able to shoot a 36# target recurve 100 yards and hit the target just had to extend the sight bar all the way out and take the apreture all the way down.
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Re: How heavy do you go on arrow weight.....etc...

Postby Jason on Tue Sep 01, 2009 4:43 pm

Greg, wondering if you saw my question above?
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Re: How heavy do you go on arrow weight.....etc...

Postby Jerod B. on Tue Sep 01, 2009 11:36 pm

Jason wrote:Greg, wondering if you saw my question above?



....momentum with arrow weight...not just KE...since velocity is squared in KE....you could shoot the lightest thing on the planet and still show good KE due to increased velocity...but not necessarily more momentum or "punch"

....momentum on the other hand is weight x velocity divided by 225,218......a decimal is the result, but the key is to compare the momentum of a heavier arrow to a lighter one to see the PERCENTAGE of momentum you have with the heavier arrow over the lighter one....

I forget the exact figure, but a 60lb bow with a 500 grain arrow will have more momentum with either a 400 or 450 grain arrow on a 70lb bow....especially down range...
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Re: How heavy do you go on arrow weight.....etc...

Postby GregE on Wed Sep 02, 2009 12:47 am

JB did a good physics explanation. Momentum is what makes the BH cut deeply, KE just gets it there quickly. ;)

The reason it was legislated was the leadership of the WA Bowhunters and WFAA were afraid the trend to SPEED was getting out of hand and came up with the formulas based on the manufaturer's Gr per Draw Wt recomendations in place about 10 years ago. ( they may still be..) The 300 gr minimum was to catch the youth and weaker adult archers from shooting knitting needles with lower poundage bows.

OR has a 40 # min for deer and 50# for ELK based on old recurve standards. WA doesn't have a minimum draw wt but had the same concerns to make sure you were shooting sufficient 'ooomph' to do the job.

The main lesson is each state has their own standards and you need to be familiar with them. NOt sure if the Providences ahve common rules.
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Re: How heavy do you go on arrow weight.....etc...

Postby Jason on Wed Sep 02, 2009 10:33 am

Jerod B. wrote:I forget the exact figure, but a 60lb bow with a 500 grain arrow will have more momentum with either a 400 or 450 grain arrow on a 70lb bow....especially down range...


I think this is what I said in my post....that a lighter bow should require a heavier arrow, not a lighter arrow as noted by WA laws.

I understand that at a certain weight, an arrow becomes too light regardless of bow speed and that a lighter arrow carries less KE. I think the answer to my question would be as Greg explained it....WA has used manufacturer specifications for safely shooting their bows as opposed to common sense calculations as to what sort of energy (KE) is being transferred from the arrow to the animal.

Kinetic energy is the amount of "stored movement energy" that an object has that it can transfer to another object. I think this is exactly the determining factor as to how much penetration or "punch" an arrow will have. JB, I understand what you're saying about "shooting the lightest thing on the planet" scenario but that's why I agreed with having a mininum arrow weight. My point was that the law states that you have to have a heavier arrow for a faster bow which is the opposite of what makes sense.

Greg, BC's restrictions are that a bow must have a 40lb draw weight for all big game except Bison, which require a 50lb draw weight. All broadheads must have a minimum 7/8's in. diameter at the widest point. They don't specify a minimum arrow weight, although I think it would take some effort to put together a hunting arrow that was less than 300 grains.
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Re: How heavy do you go on arrow weight.....etc...

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Re: How heavy do you go on arrow weight.....etc...

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