Tuning Help!

[JAH518]

Sounds like an arrow mismatch for spine.  You should not be hitting the shelf after release.

It's not about adjustment if your arrow is not spined correctly.

What Limbs do you have?  weight?  drawlength?  spine of current arrows?

Mike

I have the ACS-RC 43-17 @ my 28'' draw I'm scaling 44lbs. I'm currently shooting GT traditional 5575 (400) @ 29'' (shaft only length) total of 165gr up front and 9gr nock weight. Bow is set to 8'' brace and even tiller with current nock point at 3/4 over center.

From 1/2 - 3/4 over center the problem of burning up the shelf rug and arrow fletching is gone but flight is still proposing. I'm not seeing any noticeable left to right (fishtailing) with bare shaft. I know the 400's are on the stiff side but worked great out of my 50lb 54'' reflex deflex so thought they could work out of a past center cut bow.  As funny as it sounds I'm actually getting better flight from bare shaft than fletched.

[Orion]

If you're getting better bare shaft flight, that means your feathers are still hitting the riser somewhere they shouldn't.  Have you tried turning cock feather in?

[JAH518]

Yes, I played around with that a little yesterday and it did help a bit. I'm going out of town for a few day and won't be able to play with it for a few. think I'm going to order some 500 spine so when I get back I can start from scratch with them.

I really do appreciate everyone who has chimed in to help me out.

To be continued................

[Friend]

Highly expect the current setup is over spined….an additional 2"s plus in shaft length may be required for the 165 gn point or a 225 gn point range at the current 29" shaft length would be my calculated estimate.

[JAH518]

So I got a chance to shoot again tonight and picked up a bare shaft GT 500 to shoot and try to tune. The 500 is 30" and a 125gr point so if figured this would be a great starting point. First shot I get a massive nock left flight from 5 yards. I thing no way so I try again and same thing, I installed a 200gr point and no difference. I then shoot a 29" GT 400 with the 200gr point and get the same results.
At this point I figure it must be me, my release, twisting the string while drawing or something. I shot 4 more times with both arrows using a old string release to eliminate possible string twist or poor release but got the same nock left. I then had my wife shoot it and again nock left. Could this be why I got a like new bow for a great deal?

Side note: this isn't my first trad, I've been shooting recurves since I was 5 and never had a problem tuning. This is my first ILF and looking like it my be the first bow I use as firewood.

[Bart S]

If you were getting nock left with the 30" .400 spine and 125 grains up front, you're likely underspined. Instead of going up to 200 grains, maybe drop down to 100 or start cutting the shaft down. Also, if you're able to film it, that could help seeing whats going on.

[JAH518]

If you were getting nock left with the 30" .400 spine and 125 grains up front, you're likely underspined. Instead of going up to 200 grains, maybe drop down to 100 or start cutting the shaft down. Also, if you're able to film it, that could help seeing whats going on.

Thanks Bart, but I don't think spine is the problem at this point. I'm only pulling 44lbs and 29" arrow is as short as I can go. I shoot the same .400 29'' out of a 55lb Treadway and they fly like lasers.

[Roy from Pa]

Are your limbs marked top and bottom?

[JAH518]

Are your limbs marked top and bottom?

Roy, they are not. I placed the limb with the specs i.e. poundage on the bottom.