Overspined?

[RG]

Here's the question you need to ask yourself.   Are my shots going where I want them to and are my arrows flying the way I want them to?  If the answer is yes then what else matters?   I had and archery shop for 7 years, went to the PSE dealer tech school and tuned a ton of bows.  Here's what I learned.  If it works don't fix it!

[Gamblin Guy]

Here's the question you need to ask yourself.   Are my shots going where I want them to and are my arrows flying the way I want them to?  If the answer is yes then what else matters?   I had and archery shop for 7 years, went to the PSE dealer tech school and tuned a ton of bows.  Here's what I learned.  If it works don't fix it!

What he said....and when I really screwed something up on my bow I could bribe you with a little duck jerky to fix it.   

[Gamblin Guy]

Todd will chime in with the numbers from his program when he sees this, like everyone said though, over spined is better than under.  If they are flying good with broadheads and grouping well then dont mess with it. 

Here's another resource too...

[RG]

Here's the question you need to ask yourself.   Are my shots going where I want them to and are my arrows flying the way I want them to?  If the answer is yes then what else matters?   I had and archery shop for 7 years, went to the PSE dealer tech school and tuned a ton of bows.  Here's what I learned.  If it works don't fix it!

What he said....and when I really screwed something up on my bow I could bribe you with a little duck jerky to fix it.   

Hey!  We had a bunch of people over yesterday.  The duck jerky was the hit of the party.  No BB's in anybody's teeth either.

[jechicdr]

I shoot a similar setup but with a 70# draw so I was fairly accurately spined with 125 grain broadheads (though ever so slightly over spined, the 150 broadheads made a more perfect spine according to the software while also giving me a higher front of center which should translate into better down range accuracy.  The larger surface on the broadheads of course means bow has to be well tuned and technique has to be optimal.  I think the best benefit to having the perfect spine, is that your field tips and broadheads will hit nearly the same area when shot from center shot.

[RG]

I am a big proponent of a little overspine on a hunting arrow.  An arrow always follows its point and it's the job of the fletching to stabilize it and keep it on track to the target.  Broadheads put wings on the point which makes it harder to stabilize so, as the shaft flexes, it wants to begin following the tip.  Overspining a little minimizes the flex and gives, in my experience, the most consistent flight shot to shot.  Underspined is a disaster on hunting arrows, I've done it and watched in wonder as the arrows snaked their way downrange after flying perfectly with field points.


http://www.bing.com/videos/search?q=video+arrow+flight&view=detail&mid=59F75A790821104C7F5D59F75A790821104C7F5D&first=0&qpvt=video+arrow+flight

[Jonathan_S]

To wrap this thread up, in case someone is reading it for tidbits in the future.

I went to the shop last night and paper tuned, got all the fishtailing out of my flight and ended up getting my nock point moved up as well and the arrows are flying excellently now - through paper and my groups are tighter under 30 yards.  Took about 20 shots to get it right.

I tried a few shots with a 100 grain point just to see the difference - in this case made the problem far worse.  With a 125 grain point they shoot much better and my FOC is 13.3% for what it's worth.

BOW:  60 lb Bear Encounter RTH
Draw Length:  27"
Arrow Length:  28"
Arrow: Easton ST Excel Carbon 340 2" Blazer Vanes, offset (exchanged the Beman MFX Bone Collector 340)

Thanks again everyone for your help.

It sounds like typically 340 would be too stiff for this setup however...

Here's the question you need to ask yourself.   Are my shots going where I want them to and are my arrows flying the way I want them to?  If the answer is yes then what else matters?   I had and archery shop for 7 years, went to the PSE dealer tech school and tuned a ton of bows.  Here's what I learned.  If it works don't fix it!

following this idea obliges me to stick with what's working.

If I have problems when I put broadheads on, I'll examine the arrow selection again.  For now though it would seem that the bow is properly tuned.
Here's the question you need to ask yourself.   Are my shots going where I want them to and are my arrows flying the way I want them to?  If the answer is yes then what else matters?   I had and archery shop for 7 years, went to the PSE dealer tech school and tuned a ton of bows.  Here's what I learned.  If it works don't fix it!