That I can use to find what arrow/setup would give me the most KE out of my bow? I think for the first time in my life I am going to give expandables a try this year and wanted to surely get the most out of my bow that I can!
I don't think the most KE is necessary but sufficient KE is. Along with sufficient KE you need to have the bow and arrow tuned together. List your bow make/model/year, DW, DL and current arrow make/model tip weight, and length. Some of us use software to get in the ballpark and if we have your numbers we can do that.
Thanks Bruce! Year:2000 Model/Make: Martin Jaguar Magnum DW: 64lbs currently but have no problem shooting 70lb if need be, I want to get the most so....? DL: 29" Arrow: Beman ICS Hunter 400~~8.4GPI~~30" from nock to end of shaft~~100grn tip I appreciate your time, let me know if you need more info??
I don't have OT2 here at work but I do have AA. Some of the calculated numbers for what you gave me are: FOC - 11% Arrow weight - 395 Arrow speed - 265fps No KE with AA but there are some online programs (bowjackson)that give you a number. I get 61 ft-lbs of Energy for your setup. That should be enough if you are well tuned and make a good shot. I would also suggest the 1.5" expandable.
according to Rage the chart they produce says that 60Lbs of KE is plenty for the standard 3 and 2 blade heads...1.5 are designed for less than 40 KE.. are they being too generous?
Yeh I hear ya Jeff. i really want to continue shooting the 2 Blade 2" cut, but I don't know what the requirements are...I shot them last year with good results pushing about 63 lbs of KE and I have lost about 2-3 lb of KE since last season due to adding somethings to the string and slowing the bow down from 280 fps to 275 fps...I don't know if that's a big deal or not... I liked the wide gash and good blood trails from the 2" cut. I didn't have any issues with penetration, but i took really close shots.. I only shoot out to th 30 yds in most cases max..
Bruce, thanks but I am curious to something? Did you run them numbers at 64lb draw? I ask because a few years back I shot a 9.8GPI 30" aluminum arrow at 264-268fps range? I may have to shoot some arrows through the chrono at both 64lb and 70lb to see where I stand? Did you run the numbers at 70lbs? Also the purpose of my post is to see if my arrows are the best for my bow? Do you think with where I am at now, this set-up is fine or could I potentially see better results with a different arrow? I know I have to be careful not to tread on the spine of the arrow, just wondering what would give me the most out of what I got?
I guess my thinking is completely wrong then? I thought that if I was underspined/overspined with an arrow that is when you will start to have tuning issues? When you mention that "some point"....that is the question I am trying to figure out??
I am at home and using OT2 now but the numbers are very similar at 64lbs DW. They actually show you being a little bit weak spined. If you wanted to change arrows you could go with the same ones except at a .340 spine. Then you could go to a 150 grain point. Expandables are all 100 grain so you would need to get a weighted insert, 50 grain would work. You would be right at the same DW and speed but now you have a 13.7% FOC, arrow weight of 456 grains and a KE of 70.33. There are other ways to get similar numbers but, if I were using an expandable, I would look for numbers like the ones I just gave you.
Bruce~~ I cant thank you enough!This is the kind of answer I was looking for! So as long as I get an arrow in the 9.3GPI and above and add a 50grn weighted insert I should be good to go! What if I went with an arrow at the 10+GPI range?? Also if I am reading this right even if I do go with all the info you provided it would do NO GOOD for me to raise my draw weight? it really is no problem if you were wondering, I just shoot 64lbs because its easier for 3d shoots!! The numbers really werent that different compared to 64lbs to 70lbs? I have not a clue how this stuff works...haha!! Also did you read my post above about the aluminum arrows, how do my numbers not even come close to yours?
Hardwoods, I think as long as you got 60 lbs or more with the set up you have you should be fine. I mean you can shoot the 1.5 Rage if you wan t to know for sure, but I shot and killed deer last year with these heads with less than 70 lbs of KE.. would it be better if I had that KE?? Hell yeh it would, but no matter what I do, I still have a 26.5" draw and there is only so much KE I can get. So I have decided to stick with this set up and shoot the standard 2" heads...I am at the peak now before I fall into the neg side of things with KE and speed...60 lbs is enough for the size deer I shoot here in Va and for the distances I shoot at deer.
Spine is the key here, not GPI. It doesn't really matter to much what the GPI of the arrow is, within reason, but the spine matters a lot. You can increase your DW but the arrow would have to change. What you will be doing is adjusting your DW to tune your bow and arrow and then it will be what it will be. You could also go with a 29" arrow and that may let you increase the DW a little. The important things, at least to me, are correct dynamic spine, good arrow weight and good FOC. You said the aluminum was going in the 264-268fps range. The calculations I gave you said your current arrow was going in the 265fps range. The numbers seem close to me but perhaps I am not understanding what you are asking.
[/quote] You said the aluminum was going in the 264-268fps range. The calculations I gave you said your current arrow was going in the 265fps range. The numbers seem close to me but perhaps I am not understanding what you are asking.[/quote] I meant that with the aluminum arrow it weighed in at 9.8GPI which if I am thinking correctly(??) would make the total arow weight roughly 430? I didnt understand how with a lighter arrow I would be shooting at the same speed? Then again I dont know much of anything about this stuff!! So for me to shoot 70lbs I would have to shoot roughly a 10+gpi arrow and still add the weight tube? Then even if I did do that it still probably wouldnt gain me much if I am reading what you are telling me correctly, right??
