royden
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Post by royden on Jan 17, 2010 0:16:00 GMT -5
According to the numbers presented all of the arrows SHOULD have come out to a matching weight ... why did they not? Other components also vary in their weight's ... but you are within 1 grn (+/- .5 grn) not shabby at all! I think the next place you will see a big difference is when you loose the quickspins - due to weight and resistance. POI has been affected by a number of variables now: you changed FOC, spine and weight - all of which affect the POI.  The trick can be to figure out what each one of those is doing - or just have fun and shoot! |
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SPIKER
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Post by SPIKER on Jan 17, 2010 0:17:58 GMT -5
Ok, but keep in mind that you are shooting 70#. To keep a 5 grain per pound of draw weight you should try to get your arrow weights up to around 350 gr. I know, the variables can be maddening, but like Royden said...welcome to archery.  |
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Post by omegabuck on Jan 17, 2010 10:29:38 GMT -5
I recently backed it down to 63 pounds. According to the information provided ... (regarding the particular arrow I'm using) that weight should be ok with the spine I have. That is where I began testing. I will increase weight with new arrows ... Victory makes nice ones.  Ok, but keep in mind that you are shooting 70#. To keep a 5 grain per pound of draw weight you should try to get your arrow weights up to around 350 gr. I know, the variables can be maddening, but like Royden said...welcome to archery. |
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Post by omegabuck on Jan 17, 2010 10:34:43 GMT -5
First, I changed the arrow length (spine being better) and a side effect was weight reduction. At this time I haven't made any other adjustments. I will say that the arrows are driving MUCH HARDER!! going much deeper in the target than before. Today at the range, I will address the issues previously mentioned. Once that has been addressed, I will tackle the fletching issue. I, like you think it will be a big difference. POI ... I'm not certain what that means. Point of Impact? According to the numbers presented all of the arrows SHOULD have come out to a matching weight ... why did they not? Other components also vary in their weight's ... but you are within 1 grn (+/- .5 grn) not shabby at all! I think the next place you will see a big difference is when you loose the quickspins - due to weight and resistance. POI has been affected by a number of variables now: you changed FOC, spine and weight - all of which affect the POI. The trick can be to figure out what each one of those is doing - or just have fun and shoot! |
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Post by omegabuck on Jan 17, 2010 11:11:29 GMT -5
Ok, so I just went out and shot 2 rounds of 6 total arrows ... the only 27" arrows I have. I haven't adjusted anything ... the 20 yard pin is off slightly, but not terribly, of course I expect that to change when I begin making adjustments. The first two are high, which is where the sight is off. I was aiming dead center on the first one (highest) made an adjustment to slightly low of dead center (2nd to highest) then went bottom portion of dead center for the rest. Here are the results.    So far I can tell you that the arrow penetration has increased no LESS than 3 fold ... without making any adjustments (other than cutting 2" off the arrow) |
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SPIKER
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Post by SPIKER on Jan 17, 2010 11:47:26 GMT -5
Let's not confuse "weight" with "spine". Every manufacturer makes their arrows to a particular "spine". This determines how much the arrow flexes out of the bow depending on length, and draw weight of the bow. "Weight is a separate value. It is expressed in "gpi", or "grains per inch". You can get a rough idea of arrow weight by looking at the manufacturers spec for that particular arrow.   At 6.4 gpi, a 27" arrow would come out to 27 x 6.4 = 172.8 Add the insert = 14 gr nock = 10 gr fp =100 gr blazer vanes (3) = 18 gr Total = 314.8 gr.315 divided by 63#= 5 gpp. Right on the money...except...that's in the 350 spine which is slightly over spined for that weight, at that length. The good news is that it really doesn't matter all that much. I shoot at 63#, 27 1/4", and I have no problem. So, if you decide to raise the poundage of your bow, you will be getting closer to optimum spine, but at the same time decreasing your grains per pound.  |
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SPIKER
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Post by SPIKER on Jan 17, 2010 12:59:36 GMT -5
Ok, 20 yds is a good start. Now go to 10 yds, and see where your arrows are grouping. Then 15 yds. then 30 yds. This will tell you how tuned your bow is. |
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Post by omegabuck on Jan 17, 2010 14:35:37 GMT -5
The arrows are 8.4 GPI ... the spine of the arrow is for the poundage that I was pulling (which has since changed without my permission, so testing will have to start over)  By decreasing the length of the arrow, it actually improved the spine of the arrow for the original poundage that I was pulling ... a side effect of the shortening of the length is it removed a total of 61 Gr off the original arrow weight. At the range today I was using my 40 yard pin, hitting about 6" high on the 60 yard target. Obviously the pin is off. I did destroy a nock off an arrow at 20 yards, eventhough the arrows are flying like a badly thrown football. They're still grouping well, just not flying worth 2 cents. I've got to be making contact somewhere, I will just have to track down where the contact is actually coming from. |
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royden
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Post by royden on Jan 17, 2010 16:29:37 GMT -5
hmmm ... badly thrown football, shooting quickspins. Those fletch stick up more than others so fletch contact is a possibilbity - take some lipstick to the fletch of one of arrows, then shoot the newly glistening arrow and inspect your bow and arrow after the shot - that will tell the tale.
what spine of arrow are you shooting again? I was thinking that you should be close with the 55/70's at 27" @ 63#
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Post by omegabuck on Jan 17, 2010 17:18:41 GMT -5
400 is the arrow .... Quick Spins .. possible. I just tore a couple off of them during adjustments. Obviously they're hitting somewhere, just not sure where. I WOULD use lipstick ... but apparently it looks like a crayon ... I'll have to pick some more up. Let me tell you, the young ladies around here take a serious look at me when I'm on that aisle. LOL I asked my Wife to pick me some up but it wasn't bright enough ... so I went and got some a street walker would be proud to wear. LOL    These last two are the vane issues. I figured it was contact because they started screaming shortly after release ... during flight.   hmmm ... badly thrown football, shooting quickspins. Those fletch stick up more than others so fletch contact is a possibilbity - take some lipstick to the fletch of one of arrows, then shoot the newly glistening arrow and inspect your bow and arrow after the shot - that will tell the tale. what spine of arrow are you shooting again? I was thinking that you should be close with the 55/70's at 27" @ 63# |
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The trick can be to figure out what each one of those is doing - or just have fun and shoot!
