Paper Tuning - Heeelp

recurvericky · August 24, 2011, 09:19:00 PM

I am attempting to paper tune my 64" Moderate R/D Longbow. It pulls 55lbs @ 29". No matter what I have tried I am showing a weak spine. Below is what I have done.

*Beaman Bowhunters 500 145gt points
*31 1/2" nock left 1 3/4"
*cut 1/2" off nock left 1 3/4"
*continues to reduce shaft length down to 29" and still nock left 1 3/4"
*tried a Hertage 250 31 3/4" 145gr point with same results.

When shooting, my bow is 6 feet away from the paper. Does anyone have suggestions as to what my problem may be?

Looper · August 24, 2011, 09:47:00 PM

Give us a few more details. What is your actual draw length? What bow are you shooting? Is it cut to center? What is your total arrow weight?

Your arrow could be hitting the riser, or you could be torquing the string.

recurvericky · August 24, 2011, 09:56:00 PM

Draw length 29"
It is a 64" Moderate R/D Longbow of my own design.
cut to center
620gr. with weight tubes and weedeater line inside

jhg · August 24, 2011, 10:02:00 PM

Too heavy.

400 spine or a lot less weight. Sorry.

recurvericky · August 24, 2011, 10:07:00 PM

I will try reducing the weight. Thanks for the help.

macksdad · August 25, 2011, 05:02:00 AM

My expierience with paper tuning a traditional bow, it can be very frustrating. Your release and shooting form can really through things off. Try the bare shaft planing method and you may have better luck. There is a thread on here that I believe is titled Ol' Adcock , if you search it , and try that method you may find it very helpful. My current setup doesnt always shoot that great through paper bit it is very consistent at 20 yards. I would also recomend keeping your arrow weight close to 10gr.per pound of actual draw weight.

joekeith · August 25, 2011, 06:12:00 AM

I think your problem is that "you're paper tuning your trad bow".

Javi · August 25, 2011, 08:48:00 AM

QuoteOriginally posted by jhg:
Too heavy.

400 spine or a lot less weight. Sorry.

ding, ding, ding...

BobCo 1965 · August 25, 2011, 10:35:00 AM

QuoteOriginally posted by jhg:
Too heavy.

400 spine or a lot less weight. Sorry.

I am not following, do you mean that the total weight of the arrow is too much or perhaps tip weighs too much?

Since arrows with varying spine .500 through .250 with the same tip had the same results (along with shortening shafts), I'd have to say that spine is not necessarily the issue. Sounds like you either have clearance issues or archer caused reasons such as torque etc. going on.

August 25, 2011, 10:41:00 AM

QuoteOriginally posted by BobCo 1965:

QuoteOriginally posted by jhg:
Too heavy.

400 spine or a lot less weight. Sorry.
I am not following, do you mean that the total weight of the arrow is too much or perhaps tip weighs too much?

Since arrows with varying spine .500 through .250 with the same tip had the same results (along with shortening shafts), I'd have to say that spine is not necessarily the issue. Sounds like you either have clearance issues or archer caused reasons such as torque etc. going on. [/b]

I would have to agree with BobCo on this one!

Bisch

jhg · August 25, 2011, 11:03:00 AM

Lets see what he discovers. I still think he has them too heavy, whether its tip wt or all the stuff inside them making them act stiff -kick off the shelf- I don't know. Its faster to just knock off a bunch of wt and see what it does than to cut them and have a shaft you can't use.

Tutanka · August 25, 2011, 02:43:00 PM

Not sure what your nock height is at, if it's below a 1/2" move it up to around 5/8", and try a couple of arrows. It sounds like you are hitting the bow somewhere, espicially if that range of spine is acting the same way.

recurvericky · August 25, 2011, 02:46:00 PM

My nock is 1/2" above 90. I will work on it this afternoon and report back.

Flying Dutchman · August 25, 2011, 02:53:00 PM

For proper papertuning (as for bareshaft tuning)you must have a proper form. When you cut your shaft down 1,5 inch and you still don't see any difference it tells more about your form then about your arrows I am afraid.
I don't know how long you shoot, otherwise you could use Stu Millers Dynamic Spine calculator. Hope this helps.

Shawn Leonard · August 25, 2011, 04:16:00 PM

Go to 12 ft. The arrow is still flexing at 6ft. Also do not bareshaft, flecth the arrow up and than adjust by the tear. If ya bareshaft tune go to OL Adcocks page and bareshaft by point of impact. I believe you are in the ballpark. I would go to a .400 spine at 31" and forget weight tubes and put 275 point weight on and tune from there. S

Jim Wright · August 25, 2011, 10:00:00 PM

many reccomend bareshafting at 15 feet.

recurvericky · August 30, 2011, 10:57:00 PM

I tried all the above suggestions with no luck. After talking with Bow-n-head, I reduced the riser to give a more cut to center riser. Combined with Heritage 250's and 175gr field pts I am now shooting bullet holes.

Thanks God, I thought I would go crazy. I have never had that much trouble tuning a bow.