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Discussion Starter #1
Are we talking about shaft stiffness? The reason i ask this is because i am having trouble getting my GT Ultralight X-Cutters to fly right. They group great but i can see a wobble as it leaves the bow. This is a new bow, Switchback XT 65# 30dL
TR Droop Zone
Fletch Hunter
GT is cut to 27" Blazer 90gr Nib
What do you think? I have set-up 5 or 6 bows without any problems, but this is the first time with this arrow and the first time for a droop away rest. :confused:
 

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scoop88 said:
Are we talking about shaft stiffness? The reason i ask this is because i am having trouble getting my GT Ultralight X-Cutters to fly right. They group great but i can see a wobble as it leaves the bow. This is a new bow, Switchback XT 65# 30dL
TR Droop Zone
Fletch Hunter
GT is cut to 27" Blazer 90gr Nib
What do you think? I have set-up 5 or 6 bows without any problems, but this is the first time with this arrow and the first time for a droop away rest. :confused:

Spine refers to shaft stiffness.

The GT X-Cutters are part of the GoldTip
lightweight carbon fat shafts.

30X, X-Cutters and the Series 22 shafts.
They are all available only in one stiffness (really stiff).

These shafts do not follow the typical "proper spine" theories.

They are all off the scale stiff.

It takes some experimentation
to see what will work for your bow.

1) centershot must be perfect. Use Walkback Tuning.

2) you need to experiment with the nock point elevation (d-loop).
You can do this by sliding the d-loop up and down the center serving
or
you can do this with tiller adjustment.

3) try dropping the draw weight below 60 lbs.
 

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Discussion Starter #3
I will try all of the above tomorrow. So you think it is set-up...I have played around with the rest, moving it left and right but that didn't help. I will work with the loop tomorrow...Thank you :embara:
 

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If they are grouping don't mess with them. ;)

Arrow wobble that you see is not a big deal if they land where you aim.

I've never gotten carbons to work for me but good luck with those. I find aluminums work much better especially 2512s but the are fragile.

ox
 

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In archery terms spine means, the ability of an arrow to flex , or the resistance there of , your arrow should flex somewhat , if too much it creates accuracy problems , if not enough it creates accuracy problems . Your arrows need to be matched to your bow , this is one of if not the most critical aspects of archery .
 

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I've never been able to personally verify what Jimmy is saying. In other words, over the years I could tune arrows on the light and heavy side of the chart to shoot withe the same accuracy levels but I never went to the extremes with it. I recently had to drop my bow weight by 10 lbs due to arhtritis in my neck and I'm still shooting ACC 360's 29" and after re-tuning my Tribute they are every bit as accurate as before but technically Jimmy's right.
 

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Spine is a measurement of the deflection of the arrow. The arrow is supported at a span of 28" and a weight of 1.92 lbs is applied. The distance the arrow deflects in inches is "spine". The X-cutter has a spine of .250 which is a 1/4" (stiff) deflection. Your setup should have a spine of .400 or .340 to tune the "easiest". The X-cutter will shoot , but you need to play with your point weight. Spine (dynamic) can be adjusted by adding or subtracting weight from the tip or rear. If you add weight to the front of the shaft it will deflect more (nock moving faster than the tip initially) or "weaken" the shaft. You can also shoot a longer arrow shaft to weaken the spine. On the other hand if you subtract from the point it will begin to move faster and thus "stiffen" the shaft. Shooting a shorter shaft stiffens the arrow as well.
 

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Spine

you need to put the heaviest point GT makes140gr.because the arrow is very stiff(spine 250).Had the same problem you did.after i put the heavier point it tune alot better but lost speed.maybe that will help.BP
 

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BROTHER POPE said:
you need to put the heaviest point GT makes140gr.because the arrow is very stiff(spine 250).Had the same problem you did.after i put the heavier point it tune alot better but lost speed.maybe that will help.BP
You can also try cutting the X-cutter shaft
1/4-inch past the arrow rest.

Drop the draw weight down to 60 lbs or even less.

Adjust the tip weight to get 8-9% FOC.

This will reduce the overhang
and it will make the arrow ultra stiff (off the charts stiff),
and it will reduce oscillation practically to ZERO.

Tiller and cam synch must be perfect.
Centershot also must be perfect.

I shooting a Rytera Bullet X
at 57 lbs of draw weight,
with GT Pro Series 22 shafts
cut at 27.5 inches of shaft length
with the bow draw length set at 29.8-inches
with 80 grain tips.

This is off the scale stiff.
Estimated speed is above 290 fps.
Kills x-rings at short, medium and long distance.

I had to adjust the tiller a tremendous amount
(bow looks very strange),
but it shoots well.

I was lazy, and should have moved the d-loop further
up the center serving, but both methods work.

So,
the GoldTip 30X shafts
the GoldTip X-Cutter shafts
the GoldTip UL Series 22 shafts

they are all only available in one stiffness rating
and are intended for bows at all kinds of draw weights.

All three of these shafts are off the scale stiff.

I don't know for a fact,
and I can only hypothesize....

the design intent of these shafts were ultra light weight,
large outside diameter, very stiff
so you have a rapid recovery rate for oscillation (stops wobbling very quickly)
and a very small wobble amplitude (only wobbles a very small amount)


so, if folks are shooting these shafts,
I would cut the shaft so that the end of the shaft
is very short (1/4-1/2 inch) past the arrow rest,
and try the 80 grain tips
or the 80 grain tips with the 10-grain screw in weight
and drop the draw weight, and
experiment with the d-loop position.
 

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Question for N & B

Help me out on this one...I have OT2, but it doesn't cover this arrow..

Redhead Carbon Maxx 3000 (6075)
27 1/2 to throat of nock
3" Blazers
wraps
100gr points
Total weight 362 +or-
Trykon
29dl
67dw

Is this enough arrow/spine?
I shoot extremely tight groupings, but wonder if I am okay with the arrow....

Any help would be appreciated.

Thanks
 

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Bluzman said:
Help me out on this one...I have OT2, but it doesn't cover this arrow..

Redhead Carbon Maxx 3000 (6075)
27 1/2 to throat of nock
3" Blazers
wraps
100gr points
Total weight 362 +or-
Trykon
29dl
67dw

Is this enough arrow/spine?
I shoot extremely tight groupings, but wonder if I am okay with the arrow....

Any help would be appreciated.

Thanks

You're correct.
OnTarget does not have this arrow in the database,
and Bass Pros does not list any spine (stiffness information).

Since you are shooting well with the arrow,
then that's all that matters.

:D
 

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N & B--2

I have been trying to figure the arrow question out for a while to no avail. The matrix on the arrow box shows I should be fine, but you never know.....so I went to the expert.....

Thanks. :cocktail:
 
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