Hoyt Thunderhawk, 28" draw, 63#, Easton 5mm .340 arrows. Cams are timed well and up and down seems spot on, just can't get the left/right to come out. Any suggestions?
I was frustrated at first in trying to tune them using conventional methods. It would work sometimes, often to a point where I thought it was getting pretty close, then the next small adjustment would begin to show the opposite results.
I finally decided that the full-capture aspect of the rest was causing the strange results when trying to bareshaft tune, which had long been my go-to method.
I switched to tuning by adjusting until my fixed-blade BH's hit with my field points out to 40 yards. Then I checked flight characteristics using lighted nocks and a friend watching the arrows as they left the bow, and found that when the BH and FP impact points were the same out to 40, I could never find any flight abnormalities, so that became my sole method for tuning, and has been for a decade or more.
Tuning is simpler and quicker without the complexities of tearing holes in paper that may or may not have any real effect on the flight of the arrow, and the question I want answered.... "where should my nocking point and rest be located to shoot my BH's most efficiently and consistently?"....is the one answered first.
I find that this method also minimizes the effects of incorrect spine, as the rest position that brings the impact points together may place the arrow outside the true centershot position somewhat, which allows for a stiffer spined arrow than the theoretically ideal one. Making the centershot position of the rest secondary to the one that yields the same impact points with BH and FP equipped arrows puts the emphasis on the desired result instead of on the desired starting point.
It is not the small hole, I was a little concerned by that. There is some slop in there.
The local shop had tuned it to shoot good with field points, but when he put broadheads on everything went wacky. He took it back and it got worse.
Russ, I might try that. I didn't shoot through paper, just worked with the bare shaft. Results have not been encouraging at this point, although I may yoke tune a bit first.
Levi Morgan recommends a tied in nock point under the nock in the d-loop to keep downward pressure on the arrow. That might be beneficial with the slightly sloppy hole. The WB hole is fine, just a little big.
First, I yoke tuned the bow with a bare shaft at 20 yds. Took 3 full turns on the right side and took 2 1/2 out of the left. The bare shaft went from 12" to the right of the fletched shaft and nock right to spot on straight with the fletched shaft.
Then I went to broadheads, a Montec. The BH was flying left 6". Moved the rest to the left 1/32" and they were less than 2" at 30 yds. Even then flight was not always perfect, and I wasn't happy, but my friend was getting excited.
So I grabbed a .400 spine arrow and tried it. Bingo, they were stacking. The .340 arrow was a 5mm Easton shaft and fit sloppy in the WB. The .400 spine shaft I had was slightly larger and fit the WB much better. It flew perfect. I understand what you are saying x-man, but it worked great. I think it had more to do with the fit of the arrow than the spine of the arrow.
The sad part is the local pro shop told him the sloppy fit of the WB wasn't a problem. The 25 yr old "kid" behind the counter has only done this for a year or so, and obviously lacks the expertise of the Bowsite community!
The .340's would probably work fine with the proper WB and maybe a soft nock under the arrow Levi Morgan style to give it some downward pressure. My friend leaves for a MT elk hunt in 2 weeks and is super excited to get his bow shooting well. Thanks for everyone's input.
I actually did try one. I didn't like it. There are better rests available that provide more consistency and better accuracy than the WB. Glad you got it figured. Happy hunting.
