Main Discussion Area > Arrows

Arrow spine not making sense, to me

(1/5) > >>

ksnow:
Okay guys, I've rattled my brain enough, time to rattle yours.
I am shooting in an elm bow, 45# at 26 inches, basic pyramid, 1 3/8 wide at the arrow pass.  String is centered in the handle. I shoot right handed, split finger. All this shooting is at ten yards.
I have a set of 40/45 pound POC arrows with 125 grain field tips, 29 1/2 inches long that shoot dead center. These have three 5 inch fletches (LW).
I have a set of 45/50 pound POC arrows with 125 grain field tips, 28 inches long, that hit 5 inches out, high and right. These have four 4 inch fletches (LW).
I can't understand why the heavier spined arrows (which are shorter) would hit to the right of center. I thought it was my form or release, but I've switched between the sets of arrows numerous times and the general pattern is too obvious.
I was thinking to try 145 grain points on the heavier arrows, to "weaken" the spine, but everything I read and have heard says that heavy spine should hit left. Does the 4 fletch act that much different than a three fletch?
Any ideas?
Thanks.

Kyle

willie:
kyle,

when you write 40/45  or 45/50 it reads like what it says on the box.

have you actually measured these arrows recently?

ksnow:
I don't own a spine tester, so I have not checked them.
The ones labelled 40/45 are definitely weaker spined than than the ones labelled 45/50.

Kyle

osage outlaw:
I'm no expert on arrow spine but they are 5 lbs stiffer, plus 1.5" shorter so that's more like 12 lbs stiffer than the good arrows if you go by the 5 lbs stiffer for every inch cut off rule.  Try some heavier points on them and see what happens. 

ksnow:
Osage, that's what I was thinking, they are quite a bit stiffer, why then would they hit to the right, when everything I read says left? It just doesn't make sense to me.  I think I'll swap out the 125's for 145's and see what  happens. 
Or go nuts and try some 75 pound arrows I have, that should be interesting :)

Kyle

Navigation

[0] Message Index

[#] Next page