Main Discussion Area > Arrows
spine tester
Swamp Bow:
Craig:
I'm not understanding something I think. More specifically, the second column is labeled as being deflection in tenths of an inch and as GNAS units. I understand deflection as a measurement, but not as GNAS units, or are they the same thing? I'm probably just missing something simple, wouldn't be the first time. Thanks
Swamp
boo:
I guess with a 29-32 in draw, what you are going to have to do is, make your arrow rest on each end adjustable. Then i would make a scale that never changes and record my known spine arrows at each setting, 28/29/30/31/32/. You dont have to change the weight unless you want the scale to read for all lengths.
CraigMBeckett:
Sorry Swamp Bow,
Was trying to give too much info at once without an explanation.
1 GNAS unit is 1/100 of an inch that is 80 GNAS units is 0.8 inches, 100 GNAS units is 1.0 inch etc.
Craig
***edited to correct unit to 1/100 inch had written 1/10, my bad ****
Swamp Bow:
--- Quote from: boo on December 11, 2009, 02:38:50 am ---I guess with a 29-32 in draw, what you are going to have to do is, make your arrow rest on each end adjustable. Then i would make a scale that never changes and record my known spine arrows at each setting, 28/29/30/31/32/. You dont have to change the weight unless you want the scale to read for all lengths.
--- End quote ---
A variable length tester is next, this one (which is now usable but not complete) is set at 29" which is my minimum draw. For the next tester I had thought to make a deflection chart(scale) that had separate columns that showed deflection for each arrow length for a given spine. For example:
Spine 29" 30" 31" 32"
29# 1.000" 1.035" 1.069" 1.103"
30#...
Just to be sure I understand, if I want the deflection to stay constant regardless of arrow length, only then would I need to change my weight to test different arrow lengths? For example, if I want a deflection of say 1" to read the same spine for a 29" arrow as well as a 32" arrow, then I would have to change weights for the different arrow lengths.
Swamp
Swamp Bow:
--- Quote from: CraigMBeckett on December 11, 2009, 02:45:06 am ---Sorry Swamp Bow,
Was trying to give too much info at once without an explanation.
1 GNAS unit is 1/10 of an inch that is 80 GNAS units is 0.8 inches, 100 GNAS units is 1.0 inch etc.
Craig
--- End quote ---
Okay that makes sense.
In that case, where does the arrow length variable fit into the equation?
Swamp
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