FOC question

[O.L. Adcock]

DR, No..Cause if they are tuned properly now, they won't be after changing point weight. Most folks have tuning problems they don't know about and the vast majority of them are over spined, so they go up in point weight and WOW, things got better. But it had nothing to do with the FOC.

Different FOC's doesn't over ride the effects of speed and gravity. If you increase arrow weight, it'll be slower and have a greater trajectory compared to a lighter arrow equaly tuned.

No one is going to see any trajectory benefits at under 20-30 yard hunting ranges, what they should see is tighter groups and better penetration. How much depends on a lot of other factors unrelated to what the FOC number is. A well tuned 10% is better then a poorly tuned 30%!   ...O.L.

[O.L. Adcock]

DH, Yep! The flight stuff, we don't shoot the lightest arrows we can either, but still light in comparision. It takes energy to over come drag and it takes mass to carry energy. If the earth didn't suck it would be a lot easier!   ....O.L.

[Apex Predator]

Interesting video, but I can't see the need for the scale.

[NorthernCaliforniaHunter]

Thanks O.L.
In following you reason, and forgive me if I still don't get it, since I have three arrows of equal lenght with increasing weight up front, what I am doing is weakening the spine of the arrow and thus creating the erratic flight of the heaviest? Would you thus recommend I keep the weight but reduce the length to stiffen it up and see what results ensue?

Thank you! I'll get this!

[dragon rider]

O.L.

Now I'm really confused, but maybe I see a faint light dawning on marble head.  

Trying to reconcile what you said to me and to Dragonheart leads me to the following, and perhaps obvious, question.  If I increase the point weight, and the arrows fly better and penetrate better, does that mean that they were not properly tuned for me and my bow at their prior point weight?  I think that's what your earlier comment about only one point weight tuning properly for any one shooter and bow, but would appreciate either confirmation and clarification.  And thanks for your time and expertise.  I very much appreciate it.

[dragon rider]

P.S. my question above assumes a constant arrow lenght.  Thanks.

[O.L. Adcock]

DR, "If I increase the point weight, and the arrows fly better and penetrate better, does that mean that they were not properly tuned for me and my bow at their prior point weight?"

That's a possibility. Better tuning will increase penetration, higher FOC will also, along with more weight. Good chance it was a combination of all of them.....O.L.

[katman]

Thanks for the explanation OL, I have been following a thread on another site where it was said the heavy foc arrow would nose dive. Just needed confirmation from one who tells it like it is and just doesn't follow the pack.

[O.L. Adcock]

Katman, Yep, that's BS, just tell them they don't know how to tune a bow!    A few compounders are coming around too....O.L.

[metsastaja]

All I know is I followed OL's tuning web paper and I now have CE 250's carring 325g up front. Total arrow weight is 673g.  Flight is terrific penetration way greater then anything I have shot before and at 20yards they group with my properly tuned field points.  They definitely do not nose dive. arrows in photo are weighted 225,245,275 and 325g up front. Group is 5" at 20 yards.
here is a photo of arrows of varying weights


Here they are from the back

[katman]

OL, Oh sure tell them that and get my flame suit on again.  

[dsa1817]

Hey metsastaja, what are the specs on the bow you're shooting?  Weight, drawlength, amount of centershot, etc.  Just curious.

[metsastaja]

The bow is a copperhead from crow creek bow built by Elmer Patton. 58" 54@28

[tiur]

Mr. Adcock,in regards to the the 300 xtreem , still in the quiver or above the fireplace??
ASL

[O.L. Adcock]

ASL, Been shooting them and they are great. Haven't had the opportunity to turn them loose at warm meat!    Get busy and make a 250-300 grain glue on!   ....O.L.

[obee]

where can i find ols tuning web paper mentioned above. brian.

[O.L. Adcock]

http://www.bowmaker.net/tuning.htm

[obee]

thanks o.l. for the info, very informative, will try out this week. brian

[obee]

have in the past tuned compound bows using paper tuning method, were more options with compound, berger button spring etc. will try bareshaft tuning and work on side plate recomendation both bottom and side plate worn, need replacing,to check proper location of each before tuning arrows.thanks again.