Trad Gang

I have just finished putting up Stu's New Dynamic Spine Calculator (rev 12-25-2010)

Here is a snapshot of what has been included in this latest release:

1. There has been many new shafts added to the database including: Easton 1820 Genesis, Beman ICS Bowhunters, Gold Tip Hunters, Carbon Express Predator II, Easton A/C/C, Easton Axis FMJ, and Bullseye Premium Shafts

2. Our Warbow shooting friends asked to increase the allowed draw weight so the new limit is now 240# --- That should cover everyone!

3. Center cut selections now include +3/4" and +7/8" for those shooting wide handled selfbows

4. The fletching options have been enhanced to now include "Bare Shaft" & "Other" options. When selecting other you now have a cell to enter you own specific weight if desired. Also, 2 and 4 fletch options have been include for 3", 4", and 5" feather sizes.

5. Corrected an error to the PSE X-Weave shaft deflection numbers.

6. Added "Data Library" tab to store your own arrow and bow data as you use the DSC. This separate page can be selected by clicking on the "tab" at the bottom and is available for you to fill out and store data for your own reference.

7. You can now select specific bow makers and types! The benefit here is that the riser cut is pre-programed and you now only need to enter the thickness of the strike plate you are using. The "generic" bow types at the top of the list are the same as before and should be used when your specific bow is not yet listed. When using a "generic" bow selection the strike plate position is entered as usual.

8. The graphical format has change so that only the values in the necessary fields are shown. As example, when selecting "Wood Shaft" from the arrow menu the three boxes directly below now become active and the values are visible. Vice-versa, if for example you select "2018" those same three fields are not needed and the values will not be visible.

9. The Instruction Sheet has been updated for the new features and also improved with clearer descriptions (hopefully!). As example, many were confused at how to correctly use the footing option so I have added a graphical diagram to help clarify the most common types and how they are intended to be inputted.

Directions and download available at
  Stu Miller Dynamic Spine Calculator (http://www.heilakka.com/stumiller/)

Thank You Stu.

Thank you sir!   :thumbsup:    :thumbsup:

Cool, Thanks

Thank you.

I'm working with some 2L-04's that were too short but perfect length for Erin but she is shooting a very light draw recurve.
Maybe 20 LB at best but this will get me close.

Stu,
  Thank you for all your efforts.

Grouse

Thank you, Stu. that was very nice of you! Enjoy the holidays and this will sure come in handy!
Kennyb   :biglaugh:

Thanks for the update! I love it. Your arrow weights and such are extremely accurate. However, I find that the arrow speed is about 9 fps too fast.

Still, it's a fantastic tool!

Thanks Stu.  We appreciate your efforts.  Merry Christmas.

Thank you Stu, and a merry Christmas to you!

:campfire:  

Thank you!

God bless,Mudd

Thank you for the site

thank you for all the effort you've put into this!!

Awesome, thank you!

thanks

Thank You Sir!  One Question....if using Woodie Weights do I enter this info as a footing, or strictly increase the total point weight?

Rob I am not sure what a woodie weight is so I can't help.

You can go right to the source. Email Stu at  hkg3sg1@sbcglobal.net

Thanks Stu for the great tool, it works great! Merry Christmas to you.

Very nice.  Thank you and Merry Chrismas

Good idea to keep the guys that can pull 240# happy!  Don't want to upset them.    :scared:

Thanks Les....will do. They are metal glue on weight additives to increase weight/FOC on wood shafts.  KK and 3R sell them in a variety of weights and test paks.

Learn something new every day.

Stu,
Thank you. You have done a great service for the entire traditional archery community.
Merry Christmas!
Joe

Stu,

Let me know the data you need to get the rest of our bows in the chart.  

Thanks for the new toy.

Mike

Thank You, Sir! And Merry Christmas!

I want to publicly thank Stu for all the hard work he has put in to make trad arrow selection very easy for beginners and for all of us "old codgers" where we can experiment with different types of arrows.

I also want to publicly thank Les for hosting Stu's DSC program on his site.

Amazing amount of effort put into this product and its free! Hats off to you sirs!

Thanks very much.  I do think as well that the arrow speed runs a little hot.  But that's not significant to me:  "I love the sound of a blunt thumping in the morning."     :D

Awesome, Merry Christmas to all!

What about 3 rivers Trad Only shafts? Easton makes them.

3 rivers trad are listed on the dropdown chart.
first group after the numbered ones.

thanks and merry Christmas

Looking forward to using it.

Thank-you!

Thank you, Stu!  Merry Christmas to you and yours!

Just got an email reply from Stu regarding the Woodie Weight question I posed earlier.  His response was that we should treat them as point weight only and no entry into the footing cell.

The membership and assistance from another great member/contributor here at Tradgang continues to enrich us all.

Mike: what Stu needs is the center cut of the bow. You can email the direct and I am sure he will incorporate them for next upgrade.

Email Stu at hkg3sg1@sbcglobal.net

Just want to join the others in saying thank you for the great site.    :thumbsup:

Thank you!!!! Merry Christmas

What a wonderful and generous Christmas present.

I am sincerely grateful.

Have a blessed and joyous Christmas.

What about plungers? Any tips regarding them would be greatly appreciated. When I start bareshaft tuning, I set the middle of the arrow to the center line of the bow, with a super stiff plunger. Once they fly together, I screw the plunger out so the string lines up with the right side of the arrow, and change the spring tension to a medium setting.

To me it would seem that I should enter the center shot as (-) half the shaft diameter to get a start. (right handed shooter)

Sweet, Thank you very much, Stu is great.

Much appreciated!!!    :clapper:

Lots of time and effort - Thank You

Another toy to play with, I'm exited.  Ordering a new bow here in Jan this tool worked great last time I used it for my Big Jim Buffalo Bow, and now I can use it for that 145# Mojostick.

Thank's Stu for a great tool. Blake

Thanks so much for the update, very helpful information..!!

This is Les. MAC users please read.  

If you are using a Mac platform with either excel 2008 or openoffice 3.1 be aware there may be some glitches.  

For mac excel you need to clear and numbers out of the Center Cut and small plate thickness window before proceeding.  

The open office 3.1 release for Mac seems to not like the DSC 12-25-2010 version.

Thanks very much. it is a great tool that gets lots of use by me.

This is from Stu regarding   people who use plungers  I said I thought you would measure center cut of bow and add plunger depth. -3/16 + 1/8 (plunger extension) = center cut of -1/16

Your correct about the center cut dimension when using a plunger but that also assumes that the plunger is rigid like a normal strike plate.  Obviously the whole intent of using a plunger is that it not be rigid and that is where the difficulty lies.  The amount of sping force set on the plunger will determine how much the dynamic bow requirement increases.  A very stiff spring will cause the increase to be very small (perhaps just a few pounds) but a soft spring can greatly increase the spine required (perhaps as high as 15 pounds).  The amount of individual tuning available in the plunger setup really makes the arrow selection very user dependent.  For me, I would stay down the middle of the road and set the center cut dimension exactly as you mentioned (dimension at rest with plunger installed) and then add 7 pounds to the dynamic required.  From there I would tune that arrow using the normal plunger tuning methods.

Hello all,
Thank you so much for the encouraging and thankful posts. You are all very welcome!  I am happy toput the necessary work into this free tool and together with your help it continues to get better and better.

I continue to welcome any request for improvements. One that has already been raised is to make the performance curve (used internally by the spreadsheet) calibrated to each individual bow. This is certainly possible now that indiviual bows are included and will definitely improve the accuracy of the speed predications.

Also, any bowyer or individual that has accurate center-cut measurements for their bows that would like to send them to then I will happily include that data into the bow selection menu.   Any accuarate speed measurements are welcome!

Thanks again all and I wish you a very successful new year!
-Stu

Thank you so much Stu! Your calculator has also found its way to The Netherlands. We find it very accurate usefull tool here, except for the speed from which the outcome is a bit optiminstic.

Thanks for all the work you put into this.  It's a great resource to use!!

Cannot get it to save