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Dynamic Spine calculator. .NEW DOWNLOAD AVAILABLE

Started by wingnut, March 05, 2009, 08:32:00 PM

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calgarychef

#100
March 24, 2009, 11:25:00 PM
Wow!!!  It's a darned miracle, I don't know how to thank you.  I've been scratching my head for a long time about shafts for Africa and you've just confirmed everything I needed to know.

The chef

Curtis Haden

#101
March 25, 2009, 01:46:00 AM
Based on what I've seen out of my bows, the calculator seems to be spot-on for my aluminums.  The CE line looks to tend towards the weak side however, given my tuning results.

Example: A CE 150 cut to 29" with 15 grains nock end weight (estimated - 9" arrow wrap) and 250 grains point weight, shows a dynamic spine of 47.8 pounds.  I'm shooting a 52@28 r/d longbow, with the shelf built out to 1/16" before center, FF string, and a 28.5" draw.  That setup gives a dynamic arrow spine required output value of 58.2 pounds.  ...Yet the arrows I described bare shaft, and shoot fletched, perfectly out of that bow...not weak at all.

I think it's a wonderful tool for getting a good starting point on aluminums.  Not too sure about the carbon values.  No criticism implied.  It's a heck of a lot better than anything I could put together!!!
Rose Oak Ace 41@28
Super Shrew Gold 42@28
Black Widow PCH-X 40@28
Toelke Pika 43@28
_ _ _

A subtle play on words is better than a poke in the eye.

LeTuB

#102
March 26, 2009, 04:47:00 AM
Thanks Mike for the job done, very useful !
I have few questions :
Regarding the centershot (I've seen that I am not the only-one): on my recurve the shelf is cut 3/16 past center (information given by the bowyer), if I use a 1/16 thick rest, do I have to enter 1/4 or 1/8 in the calculator ?
In my opinion, the shaft size has to be taken into account in the calculation, for instance if my bow needs a .300 static spine shaft, the tuning will be very different if I use a 2514 or a FMJ 300 (18/64) shaft despite the static spine are the same. Assuming that the formulas were established for a 21/64 shaft (mean value) a centershot correction could be taken into account so that the dynamic spine required by the bow would increase if I use smaller  diameter shafts.
Another point concerns the use of long brass inserts, I think that the flight is different if I use a 200 grains field points with standard aluminum insert and a long 100grain brass insert with a 100 grains field point due to more stiffness in the last 2 inches on front of the shaft  . This effect could be taken into account by an artificial reduction of the shaft length equal to the difference between the used brass insert and a standard insert for which the calculations were established.
Just my 2 cents....
Caribow wolverine&Tuktu TD
Timberghost G3ss

Molson

#103
March 31, 2009, 03:53:00 PM
Did the calculator get moved somewhere?  Both the first link and updated link are bringing up Yahoo home page and no calculator.
"The old ways will work in the future, but the new ways have never worked in the past."

loco_cacahuate

#105
March 31, 2009, 06:26:00 PM
ditto
Never drop your gun to hug a Grizzly.

Stringslap16

#106
March 31, 2009, 07:21:00 PM
TTT,  I need this bad.  Fellas?
I am a bowhunter in who the old ways have joined the new

Samick Spirit II 40# at 28"
Monsters Bows Lycan (Soon)
Monster Bows Dragon (Sooner)

PowDuck

#107
March 31, 2009, 09:55:00 PM
All I get when I click on the link is a Yahoo news page. What am I doing wrong?
Romans 8:28

wingnut

#108
March 31, 2009, 10:07:00 PM
I let Stu know that the link is broken.  I'm sure he will fix it.

Mike
Mike Westvang

Toklat1

#109
March 31, 2009, 10:11:00 PM
Same here, yahoo news page!
Mark Griffin
USAF Retired
1981-2001


"When a Man comes to the mountains, He comes home." John Muir

TGMM Family of the Bow

hkmp5

#110
March 31, 2009, 11:53:00 PM
Hello Guys,
I appologize but Yahoo has decided to discontinue their "briefcase" and this was the only place where I had access to store documents on the web.  I will look for somewhere else to put the file but right now I have no options.  If you need a copy, feel free to email me at:
hkg3sg1@sbcglobal.net
I will then send you the file directly.  Sorry for the inconvienence, if anyone has any suggestion please feel free to pass them along.
-Stu

PowDuck

#111
April 02, 2009, 08:22:00 PM
If it's a spreadsheet (excel) type file, you could get a gmail account and put it on their online documents.
Romans 8:28

#112
April 02, 2009, 10:11:00 PM
Mike, when I click on the link, it goes to a Yahoo search page? I don't see anything about a spine calculator.

Bisch

daveycrockett

#113
April 02, 2009, 11:02:00 PM
If Stu don't mind I have it on my e-mail and can forward it to anyone who asks.

wingnut

#114
April 03, 2009, 07:53:00 AM
I also have a copy that Stu told me too share.

Email me at

wingnut@dryadbows.com and I'll forward you the latest edition.

Mike
Mike Westvang
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