I was playing with Stu's calculator, and was going to look at wood arrows. Is there a chart that shows the conversion between spine in pounds to deflection. Say 60-65lb = what in deflection. I can enter the deflection in the
calculator to determine what will work, but it doesn't tell me what that is in pounds. Am I missing something? I've ran several searches and came up empty. Thanks in advance.
The formula is simple. For wood, you divide the deflection into 26 to get the # spine rating. So, dividing the weight into 26 will give you the deflection. 26 divided by 60 = .433.
REMEMBER!! you divide into 26(twenty six) to get the spine rating for 28" (TWENTY EIGHT!!)
Thanks! Would that be entered into the AMO/AMA box on Stu's calculator, or the ASTM box. Thanks again!
That's the old AMO standard.