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  #1  
Old 05-20-2011, 10:17 AM
Sebastiaan Sebastiaan is offline
 
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Default arrows keep hitting left

Hello all,

Here is my problem; I can't get my arrows to the right. There is 40# behind the arrow (70"bow, spiga 650, brace hight 23,5 cm, zerro tiller and beiter nocking point at 6mm, button is on the weak side, arrow is lined out left from the string) and I want to try first indoor at 18 and 25 m. I tried 2114, 2014 and 1916 (all alu's). at 25 m they all grouped together (the 1916 is the most to the right but this is a few centimetres) I am aiming point at the gold and all arrows end in the left bleu rings. When I am going to a weaker spine the arrowflight is not good. Any suggestions? Thanks in advance.

Greetz Seb.
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  #2  
Old 05-20-2011, 10:20 AM
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Default Re: arrows keep hitting left

Where is your string in the "sight" picture? How is your centershot adjusted?
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  #3  
Old 05-20-2011, 10:28 AM
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Default Re: arrows keep hitting left

Quote:
Originally Posted by Passthru View Post
Where is your string in the "sight" picture? How is your centershot adjusted?
Hello Passthru,

I might forgot this; I am a string walker, long finger in corner of my mouth, string always on the same place. Is centershot what i call the tip of my arrow on the left sight of the string?

Greetz Seb.
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Old 05-20-2011, 10:32 AM
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Default Re: arrows keep hitting left

Have you tried different point weights? 2114's are .510 spine, 2014's are .579 and 1916's are .623.

Also you didn't mention your draw length, arrow length or point weight. There are a lot of variables here. Somebody will probably slap me silly, but I'd suggest a heavier head on the 1916 for starters.
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Old 05-20-2011, 11:02 AM
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Default Re: arrows keep hitting left

Sebastiaan, I stringwalk too. I'm currently tuning (and retuning........and retuning...) a 40# field set up. I'm tuning at 25m and for me that's a 27mm crawl. I'm using a 28" BOP Carbon One 0.600 spined arrow with a 80 grain point. My DL is 29.75" so the arrow is a little on short side.

At a later stage I will tune C-1 550's. I anticipate they may tune with a 90 grain head at about 28.5" (remains to be seen). I can unhappily report that 30.5" 0.525 spine arrows with either 70 or 90 grain points will not tune, too stiff.

Check you're not torquing the bow to the left though........been there, done that!
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  #6  
Old 05-21-2011, 04:30 AM
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Default Re: arrows keep hitting left

Thanks Greysides,

Hm.... I think I am on the right track. My 1916 is 28, 5 " with a 80 gr. bullet point is a little bit short for me too. I think I go for 29"-30" and I am using a Beiter plunger, I can use the soft spring instead of the mid version and I can try a 100 gr. point. Keep you posted.

Greetz Seb.

Last edited by Sebastiaan; 05-21-2011 at 05:00 AM. Reason: wrong arrow length
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Old 05-21-2011, 06:08 AM
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Default Re: arrows keep hitting left

I had the same problem with my two bows. My arrows were going to the left showing stiff. Instead of adding more point weight to make them weaker, since I want to use a 75 grain point weight, I raised the brace height in 1/4" increments and my arrows started going to the right.

Even though I have two bows, they're not the same poundage. I shoot the same 2212 arrow out of both bows, but if you look at my signature, you'll see the brace heights are different for each bow.
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Blacktail TD Recurve: 66", 37# @ 30". BS: 12StrDyna97. BrcHt: 7 5/8". Arrow: 32", 2212. PW: 75 Grains. AW: 421 Grains. SPD: 174 fps. GPP: 11.37
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Old 05-21-2011, 06:22 AM
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Default Re: arrows keep hitting left

Sebastiaan, have you tried any braceshaft comparisons?

I've found that changing centreshot, even a little can have BIG results.
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Old 05-21-2011, 06:25 AM
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Default Re: arrows keep hitting left

Nightwing, WOW, that's quite a change of poundage (5#) that a BH change of < 1/2" accomodates.
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Old 05-21-2011, 11:09 AM
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Default Re: arrows keep hitting left

Quote:
Originally Posted by Greysides View Post
Nightwing, WOW, that's quite a change of poundage (5#) that a BH change of < 1/2" accomodates.
I fine tuned my 42# bow this morning. I practiced at 20 yards since I'm a bowhunter. Instead of 7 15/16", I'm now at a 7 13/16" brace height. Did a little experimenting too with my fingers. I shoot split finger. I normally have one over, two under and I draw my bows with these three fingers. On a whim, still using split, I decided to go one over, three under and draw using these four fingers. This is what caused my brace height to increase on my 42# bow.

I like the way it felt and where the arrows hit on my bag target. I was scaring the bejabbers out of a pine cone at 20 yards.

I did the same thing with my 37# bow, but the brace height stayed the same, 8 3/8".
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Blacktail TD Recurve: 66", 42# @ 30". BS: 12StrDyna97. BrcHt: 7 1/2". Arrow: 32", 2212. PW: 75 Grains. AW: 421 Grains. SPD: 185 fps. GPP: 10.02
Blacktail TD Recurve: 66", 37# @ 30". BS: 12StrDyna97. BrcHt: 7 5/8". Arrow: 32", 2212. PW: 75 Grains. AW: 421 Grains. SPD: 174 fps. GPP: 11.37

Last edited by Night Wing; 05-23-2011 at 09:45 AM.
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  #11  
Old 05-22-2011, 06:52 AM
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Default Re: arrows keep hitting left

If you shoot with both eyes open and your draw arm is not on the same side as our dominant eye, then it can cause left hits for a right handed archer. I'm right handed-right eye dominant but hit left if I use the arrow for an aim point but pay undue attention to the arrow image to the right (focusing on the target causes the arrow to be doubled).
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Old 06-04-2011, 04:18 AM
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Default Re: arrows keep hitting left

Hello all,

So, today i did a little tuning on my "backyard range". I can shoot at aprox. 16 yards. I bought a 1916, made it 30" instead of 28,5" what I was using. The point weight of both arrows is 80 gr. The 30 incher is hitting slightly to the right but not enough. The next step I made was to change my brace-height from 23,5 cm to 22,5 cm indeed the arrows comming to the right. But a second problem occurred..... On the bottom of the riser-window there was a black stripe comming up???????? So I tried the old lip-stick methode and yes, one vane was hitting the riser. So I think I have a nock-point height (is now aprox. 1 cm.) problem to. The next problem (how many problems will come???) is that I am addicted to Beiter nocks and nock-points, they are not easy to change. So at first I will try a vane that is not as high as I am using now and I will change point weight to 100 gr. Keep You posted.

Greetz Seb.
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  #13  
Old 06-04-2011, 04:35 AM
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Default Re: arrows keep hitting left

Sounds like you're on the right track. You could try winding some dental floss below your fixed nock point, just as a temporary tryout. If that works out you then move the nock point permanently.

Good luck.
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Old 06-04-2011, 06:27 AM
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Default Re: arrows keep hitting left

Quote:
Originally Posted by Sebastiaan View Post
Hello all,

So, today i did a little tuning on my "backyard range". I can shoot at aprox. 16 yards. I bought a 1916, made it 30" instead of 28,5" what I was using. The point weight of both arrows is 80 gr. The 30 incher is hitting slightly to the right but not enough. The next step I made was to change my brace-height from 23,5 cm to 22,5 cm indeed the arrows comming to the right. But a second problem occurred..... On the bottom of the riser-window there was a black stripe comming up???????? So I tried the old lip-stick methode and yes, one vane was hitting the riser. So I think I have a nock-point height (is now aprox. 1 cm.) problem to. The next problem (how many problems will come???) is that I am addicted to Beiter nocks and nock-points, they are not easy to change. So at first I will try a vane that is not as high as I am using now and I will change point weight to 100 gr. Keep You posted.

Greetz Seb.
You're a right handed archer. You think the 1916's are a little stiff, and therefore hitting left. So you increased the arrow shaft to 30" and now they are a little weaker/softer and hitting 'less left'.

Your on the right track. Next you can make the arrows weaker still with heavier points, or make the bow more powerful, which you've done by reducing the brace height and therefore the pre load.

Since your points are relatively light, I'd be inclined to keep the brace height and nocking point that was working for you and just try heavier points. Assuming they are just screw ins, this will be the cheapest, easiest and least aggravating.

I'm no expert, and having bare shaft tuning issues of my own, so I look forward to your update.

Edit: I may have the advice about brace height wrong. Looking at Stu Millers Calculator instructions, he says if the arrow is weak, decrease the brace height and Vs Versa. This doesn't make sense to me, as by preloading, you are reducing the energy that can be transferred to the arrow, can someone confirm if that's correct? ie a Weak arrow, with more energy behind it, is going to act even weaker??
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Last edited by dmm; 06-04-2011 at 07:03 AM.
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Old 06-04-2011, 10:33 AM
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Default Re: arrows keep hitting left

Quote:
Originally Posted by dmm View Post

Edit: I may have the advice about brace height wrong. Looking at Stu Millers Calculator instructions, he says if the arrow is weak, decrease the brace height and Vs Versa. This doesn't make sense to me, as by preloading, you are reducing the energy that can be transferred to the arrow, can someone confirm if that's correct? ie a Weak arrow, with more energy behind it, is going to act even weaker??
The way I try to remember this is:

The higher the brace height, the higher the preload and the more force exerted on the rear of the arrow to bend it on release. This weakens it.

Because your draw remains a constant distance, a higher brace height means the arrow is on the string for a shorter period of time and thus less energy is transferred to it, so speed is less and distance is less.

And vice versa.

I'm not sure the science is as simple as that but that's what I use to remember it.

The attachment below, courtesy of Viper, may help explain things.
Attached Images
File Type: jpg Effects of brace height on spine..jpg (18.5 KB, 138 views)
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