Traditional Archery Discussions on the Leatherwall


Stu Millers new Calculator

Messages posted to thread:
Lowcountry 01-Aug-12
Selden Slider 01-Aug-12
bldtrailer 01-Aug-12
Snag 01-Aug-12
Craig Holcomb 01-Aug-12
yorktown5 01-Aug-12
yorktown5 01-Aug-12
Stu Miller 02-Aug-12
Lowcountry 02-Aug-12
Shorthair 03-Aug-12
jdigger1238 03-Aug-12
Jim 03-Aug-12
DaveSea 05-Aug-12
DNG47 05-Aug-12
Zeno's Arrow 05-Aug-12
Tradbh 05-Aug-12
DaveSea 05-Aug-12
DaveSea 05-Aug-12
From: Lowcountry
Date: 01-Aug-12




Has anyone heard when Stu Miller's new calculator will be available?

From: Selden Slider
Date: 01-Aug-12




Stu forwarded me some data using his new calculator. I'm not sure if it is available yet. You should give it a try. I do not have the correct software to download it for myself. Frank

From: bldtrailer
Date: 01-Aug-12




Stu sent me the new one and it's great a vast improvement over the older He really put alot or work and effort into this and it shows(the old was pretty good ...but this is great)

From: Snag Professional Bowhunters Society - Associate Member
Date: 01-Aug-12




He is adding more data to the new. I'm sure he will post it when it is ready.

Thanks Stu!

From: Craig Holcomb
Date: 01-Aug-12




Can't wait!

From: yorktown5
Date: 01-Aug-12




Yes, works great. But still some niggly bugs that would drive a perfectionist like Stu CRAZY. Items like drop down sub-boxes not all working properly or the arrows directing the drop down scrolling hidden with certain Excel releases.

AND, the guy has a day job.

What has impressed me the most (and he explained it to me in the chapters he wrote for my book Vintage Bows II, but I still don't know how he did it) is how accurate the speed predictions have been.

Basically, when the arrow has left the string, any remaining energy doesn't get to the arrow. But there are bow specific variables as to just when this happens and no way (I thought) to compensate. The result is that with the existing release, upper end arrow speeds are over-stated. I don't know how he fixed it, but he has.

I have now chrono'd 7 bows and compared the speed results to the new DSC predictions. So far ALL seven have been within less than 2 feet per sec. of Stu's results, MOST less than a pound. The average variation has Stu's speed predictions accurate to 99.5% AMAZING!

Rick

From: yorktown5
Date: 01-Aug-12




Oops, I forgot one. Eight chrono tests. All based on 9gpp arrows. Yesterday I also tested a modified Ragim riser fitted with Samick Sage #50 limbs. Chrono was right on at 188 fps. Wowie! This was with a normally stranded FF taken from another bow. That suggests IF I fit this mix-match bow with the same Barbee style FF as I have on my other bows, it will match my Howatts, Browning, Wing P2, Root Brushmaster and even my Super-Kodiak. Thats a surprise.

Yes, it also surprises me that with the performance string I have a Super Kodiak slinging a 9gpp arrow past 190fps although I draw past 28" with it to get there. Best I was ever able to get out of any Bear WITH performance strings has been low 180's.

No, the mix-match bow isn't as smooth as my vintage keepers as it stacks pretty hard at 28" plus, but it does so just as I reach full draw and so a VERY consistant release-pounds. Yesterday's test session had the bow equalling my Super-Diablo's accuracy.

The cheap bow's performance surprised me. But not Stu's speed prediction.

Rick

From: Stu Miller
Date: 02-Aug-12

Stu Miller's embedded Photo



Hello All, I know I keep testing your patience on this release but like Rick mentioned above, there are some bugs to work out. But mostly I have been adding new bows and shafts to the database contained within the DSC. Also, finally found a way to have it predict the average GPI of a wood shaft based on the type of wood, the diameter, and the static spine.......sound simple but wasn't! I think that will really hep us wood arrowsmiths as often we need to design the arrow before we actually have the shafts in hand to measure. One the arrow infor is entered normally then all you need to do is select which wood type your using and it will give you the average GPI. Looks like the screen grab shown.

The wood choices are: Ash, Aspen, Basswood, Birch, Cedar (Port Oxford), Cherry, Cundoo, Douglas Fir, German Spruce, Hickory, Larch, Oak (Red), Pine (White), Poplar, Ramin, Sitka Spruce, and Walnut

If anyone has any other shaft woods they are using them please let me know and I will add it.

-Stu

From: Lowcountry
Date: 02-Aug-12




Thanks Stu. I wasn't trying to rush you, I was just curious as to when it would be avalable. Sounds like it is going to be great. Can't wait.

From: Shorthair Professional Bowhunters Society - Associate Member
Date: 03-Aug-12




not sure if anyone uses maple still for arrows...but I had some back in 90s from Alleghany Arrow Woods that were heavy as hell but also about impossible to damage...great hunting arrow under 20 yards.....

may be too limited to be worth while...and some of your others are pretty heavy already.

From: jdigger1238
Date: 03-Aug-12




I have downloaded the calculator previous and checking on appropriate arrows etc. Where is a good source to have arrows made once it is known what I need?

Sorry if this is not appropriate for this thread. I have seen Stu's pictures of arrows that he made and looking for some quality arrows.

Thanks for any information!

From: Jim
Date: 03-Aug-12




Stu will it work on an Apple?

From: DaveSea
Date: 05-Aug-12




Jim, I was not able to get it working on my MAC. Excel compatibility issue.

I am talking with STU about developing a Spine-o-meter iPhone APP.

Dave

From: DNG47
Date: 05-Aug-12




Can you add Tonkin Cane Bamboo, Thanks

Dave

From: Zeno's Arrow
Date: 05-Aug-12




So, just a suggestion here. With the wood specs you are entering, someone should be able to make a calculator for Badger's mass principle approach to making bows. I know its a new project. I think I understand in principle how it could be set it up, but I just don't know Excel at all.

From: Tradbh
Date: 05-Aug-12




Yes....add Maple! Great shaft material!

From: DaveSea
Date: 05-Aug-12




Mohogony and teak too.

From: DaveSea
Date: 05-Aug-12




Mahogany and teak too.





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