O.K. Chad, here goes. Please bear with me 'cause this gets a little complicated. Perhaps JRW or some of the others could explain it a little better. Static spine refers to the arrow while suspended between two points with a weight in the middle. Wood arrows are traditionally spined over 26" centers with a 2# weight suspended in the middle and the amount the arrow deflects or bends in the middle (deflection) is measured to determine spine. On the other hand, metal arrows are spined over 28" centers with a 1.94# weight suspended in the middle. So really you are comparing apples to oranges if you only look at static spine. Dynamic spine refers to the way the arrow actually flexes under stress, i.e. the way it operates when shot from a bow. Thus when we say a 2512 has a dynamic spine of 57#-62#, we are really saying that it flexes the way a #57-62# wood arrow would if shot from the same bow, even tho if it were spined on the same 26" centers as a wood arrow it would measure a deflection equal to a 95# woody. With a center shot bow (one cut exactly to the center of the riser) or true center shot bow (one cut 1/2 the diameter of the arrow past center) you can use a considerably stiffer arrow than in a longbow which is typically cut 1/8" before center. For this same reason compound shooters can use extremely stiff arrows with light point weights compared to comparable poundage traditional bows. So while the static spine of your 2512s may be #95 when measured on 26" centers like your woodies, it is not unreasonable to see them act like 57#-62# woodies when cut to 32". Remember, for every 2" of draw over 28" you need to increase aluminum arrows by one size (5#) or 10# in your case.

Jack

Edited by - Floxter on 01/06/2002 22:00:51