Main Discussion Area > Arrows

Proper Spine

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woody:
I was looking at an arrow chart in 3Rivers only to discover that my arrows are apparently horrribly underspined.  According to their formula I should be using arrows of about an 70 lb. spine for my 50 lb. longbows.  I always knew there were allownaces for length, tip weight, center shot, etc., but I had no idea I should be 20 lbs. over my draw weight.  Does that sound correct? What do you all shoot?

And yes, I am not a good shot with my current arrows, so maybe I need to experiment a bit.

NTD:
Need to know arrow material, length, and point weight.  I shoot a 55lb bow with 125 gr. points and a 30 inch tonkin arrow.  So I shoot a 65 to 70 lb spine.  Mechslasher recently posted his spine calculator, Its good stuff.

woody:
I got my info from TTB, but I came up with completely different conclusions.

Justin Snyder:
Generally speaking you should be 10-15# under the bows draw weight. The only way you would want 20#over is if you are center shot, shooting 32" arrows with very heavy points.

What weight bow are you shooting, is it center shot, what length of arrow and what weight of point?

stringstretcher:
To get a starting point with any arrow material, if you take the number 26 for amo deflection and devide it by your bow weight, in you case 50 you will come up with a deflection of .520.   That formula has worked for any bow that I have ever set up and works just fine.  Or if you have a deflection number that is amo, you can take that number , .520 and devide it by 26 and you will come up with a poundage of 50.  This is using 125 grain points and you will have to play with length, but this formula is also for a 28 inch arrow.  If you go longer, add 5 lbs spine per inch, if under subtract 5 lbs per inch.

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