Tuning Broadheads????

[snag]

I recently made up some 95# spined woodies and bareshaft tuned them through a 55#@28" cut to center Blacktail recurve. I came up with 30"bop and 160gr. tips.  So, this morning I put some 175gr. Abowyer Brown Bear bhd's on some. They shot left barrel rolled up and to the right coming down and hitting slightly to the left of the bullseye. Hitting left for a righthander is showing weak. Probably that 15gr. difference requires me to cut these down a little. But what is up with the left to right barrel roll, going from level to high and back down to level? I use two nock pts. also. Do I need to change the nock pt.?        I would imagine that I need to cut these down to get them not showing weak first...but then? I also had some 160gr. heads that I tried and they did the same thing to a lesser extent.

[Jeremy]

Hitting left of your fieldpoints means they are too stiff, not too weak for a righthander.

If you are canting your bow at all, then you do have a nock point issue as well and you'll need to change the nock point.

Broadheads, even more than bareshafts, magnify tuning errors and should be the final tuning step.  If they are showing something, then your fieldpoints are doing it too, you just can't see it  

[Fletcher]

The first thing I would do is check the broadhead alignment.  A blade doesn't need to be very far from dead straight to steer an arrow pretty badly.  15 grains shouldn't make much difference to a 95 lb shaft.

[snag]

Excuse me...I meant to say they start out left and barrel roll to the right! Sorry.

[Steertalker]

I don't care where they hit....sounds waaaaay too stiff to me and the BH's are accentuating the problem.  Why on earth would you choose 95# spined shafts for a 55# bow???  I would recommend going with 70# spine shaft.  For woodies a good formula to use is:

draw weight + 5 lbs for every inch over 28 inches + 5 lbs for the BH = spine wt

Sooo...in your case:

55 lb draw wt + 10 lbs (2 inches over 28 inches x 5 lbs) + 5 lbs for BH = 70 lbs.

Hope that makes sense,

Brett

[snag]

I usually shoot 80#-85# or 75#-80# spined shafts with no problem. But I wanted to try a heavier shaft. This is not a problem with a cut to center bow. The arrows with just tips fly great. But obviously like Jeremy said there must be a problem that the bhd's revealed.

[Steertalker]

That's why they call it BH tuning    I still would recommend a 70-75# spined shaft.  If you want to increase weight then you'll probably need to go to a different type wood like ash.  Anyway, hope you get it worked out.

Brett

[snag]

Thanks for the advice.....

[Jeremy]

I would have guessed right around 80# with the 30" BOP arrow out of the Blacktail, and probably 80-85# range with the 175gr head (that's 55 + 10 (+2" arrow length) + 5 (higher head weight) +10 (cut to center high performance bow).

I did the same thing you're doing for the last season; went up in spine and in head weight to increase the FOC and the overall weight.  Nothing wrong with that approach at all, you just have to tinker.

Are the 95# shafts the same diameter as you're normal shafts?  Keep in mind your spine requirements decrease as you increase the diameter - it essentially makes your bow act as if it were less centershot.  I need to drop 5# in spine when going from 11/32" to 23/64".  The larger diameter also changes your nock point.

[snag]

The 95# shafts are 11/32" too. That's good info. on the diameter though. I hadn't considered that. I did find that the nock didn't to go up from 5/8" to 3/4".

[swampbuck]

"The 95# shafts are 11/32"

Are you sure about that?It's very hard to find weights that high in an 11/32 shaft.I'm sure if you sorted thru enuff it could probably be done but not what the arrow smiths I've talked to would say.

Good luck!! I went to the more cured wood myself LOL I get much better flight with carbon and it's really not a problem to get as heavy an arrow as you wish

[snag]

Yep, checked them. I bought them and was told they are 11/32" so when I got them home I pulled out the calipers. Surewood Shafts has some great shafts!  I shoot carbons too. But I love good wood shafts too. Plus I love making wood arrows. The douglas fir shows the grain so well when you stain it...just beautiful!
I switched to another Blacktail that has a wider string that will fit the nocks on these arrows better. I also changed the nock height and it is shooting much better.

[snag]

For anyone who wants good wood shafts in heavy spine weights call Surewood. They have a bin that they put the heavy weights in. They can fix you up with some great shafts in the 90#+ range