Checked the spine on my arrows recently (Doug Firs) and measuring on the same Ace spine/spin tester, find most of 'em are
about 5 pounds lighter spine than they were when I first made 'em up. I don't really have one to serve as a reference at this point, so I'm not sure whether I'm "shooting out" some spine, or if the calibration on my Ace somehow got messed up.
I'll note that a lot of the shafts have taken hard hits stumping, and target arrows have impacted the backstop ( wood or cow mat ) a lot as well.
What do you think?
Self bows can get tired.
I dont see why wood shafts are any different.
Are you careful to check the spine against the growth rings each time and not with them one time and against them the next?
Yup, checking consistently against the grain.
I've never noticed that with P.O. Cedar or Douglas Fir and I have arrows dozens of years old. I have one group of D.Fir that has been shot every day for over two years. I just checked and they are still where they were when new.
just a thought slowbowjoe when pulling your ars from a firm target pull straight back i think any twisting can weaken the fibers in the shaft
Will moisture content change an arrows spine?