help with spine on footed arrows

[Nate1990]

Hey tradgang!

Im having some trouble tuning arrows. I footed them with Osage and I think that might be messing me up. Anyway here are the specs

Arrow
POC with a 5inch two wing splice of Osage
160 grain head
60-65#
11/32

Bow
66inch northern mist Shelton
57 @ 27 (im drawing around 28-28 ½)
1/8 off center

I first cut the shaft to 31inch and shot it. The nock was out to the left. Cut it to 30 and the same thing but a little steeper angle. What’s going on? Im guessing im pulling the bow to around 60lbs with a 160 grain head. I had some 50-55 (they might have been 55-60 I cant remember) with 125 on an they flew great.  Is the footing changing the spine that much?

Thanks for the help everyone.

[Art B]

That Osage footing is probably adding one or two  spine ranges. Your 160 gr. point one or two more spine ranges. Being that your arrow is several inches longer then 28" add a couple more spine ranges for that. That brings your dynamic spine down to somewhere in the 30-40# range.

Try cutting one of your footed arrows as short as possible using a 125 gr head and see if that helps.-ART B

[aromakr]

Nate:
your 60/65@28" shafts at 30" spine 50/54, the osage footing is probably adding 60/70 grains and with the 160 grain point you are too weak that's putting 220/230 grains up front. I would increase your spine to 70/75 or even 75/80@28"
Bob

[O.L. Adcock]

"I first cut the shaft to 31inch and shot it. The nock was out to the left. Cut it to 30 and the same thing but a little steeper angle. What’s going on?"

Believe what it's telling you. You were over spined to start with. Cutting made it worse. It's best to never ever cut until you verify with point weight. Only if it got beeter with lighter points should you have cut. 65-70# should be plenty for a bow that far from center with a heavy point....O.L.

[Orion]

:confused:

[snag]

Overspined? Underspined? Which is it? I thought if the bareshaft went right and nock left for righthanded shooter it meant weak.

[O.L. Adcock]

Or a poor release, or torque in the grip. The shaft angle is of no value..If they "group" right of fletched shafts, that is a weak indication unless they are way over spined and the back end of the shaft is hitting the riser. That's why verification with point weight is so important before cutting.......O.L.