I haven't seen this mentioned anywhere, so I hope it's not old news. Stu Miller released an update the other day. Haven't even opened it yet, but it looks like there's lots of new options to choose from.
Thanks, Stu!
http://www.heilakka.com/stumiller/

Stu was here in his Santa suit a few days ago.

http://tradgang.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=097915

Oops! Thanks, Charlie. Only looked back to the 25th. Should've guessed. Anyway, now that I've been playing around with it, it's an excellent revision.

Yep, I've already used it. It has a new shaft that I'm glad to see because I have a lot of them.

Has anyone tried to download Stu's calculator to their iPad?
Having trouble here. I suspect perhaps because it is Excel based?

Can you download openoffice first? (it's a free download) They make that for Macs so it should work with your Ipad.  i use open office on my pc to work with Stu's calculator instead of excel.

Still have trouble getting my arrow specs and the calculator to line up.  My bareshaft testing always shows I need and arrow over an inch longer than the calculator.  don't know what I am doing wrong. I've just learned start with an arrow two inches longer than the calc. recommends and cut it down and 1/8th at a time.

I'm having pretty good luck with it, though I find I need to check the bow and shaft specs very carefully. Bought a scale and found bows weren't quite what I thought they were, was mistaken about the center cut on a couple, too. I think when I put the right information in, I get a good arrow, though maybe a little stiff. The new version has quite a few bows and shafts listed, so that should help. Even if a particular bow isn't listed, there seems to be something close for comparison. I've found enough variance spine testing carbon arrows to account for an extra inch needed to work properly. A few small differences could add up and account for an extra inch of arrow pretty easily. I'm glad to hear it's not suggesting you cut the arrows too short!

I shoot 32" aluminum arrows out of both of my 66" Blacktail take down recurves. Using Stu's calculator, it's very close for both bows.

For instance, with my 42# bow, I should be spot on with a 215 grain point weight. But, the 2117 arrow is dead on at 20 yards with a 200 grain point weight.

With my 37# bow, I should be spot on with a 185 grain point weight. But, the 2114 arrow is dead on at 20 yards with a 180 grain point weight.

The only real difference that I can make out between my two bows is the brace height. My 42# bow has a 7 9/16" brace height and my 37# bow has a 7 11/16" brace height.

Stu does mention when using the calculator the brace height might have to be raised or lowered a little. Something to think about.

Rastaman...thanks for the input, buri don't seem to be able to find open office for the ipad.

I'm finishing out a Surewoods test pak of arrows now and will be spec'd using Stu's calculator.  Spines are 60-65, 65-70, 70-75, & 75-80 all cut to 28.5 inches.  The calculator spines  these groups with point weights from 145-210 going up the range tested.  It will be nice to compare the actual results with the calculator to see what it tells me.  Arrows should be finished/shootable by Sunday.

Michael  I would check the center cuts of you bows. That is where most of the inaccuracies occur and will give you incorrect results.

So much work goes into this project that one feels a little guilty for asking for anything but perhaps the next time an update is made ABS Grizzlystick arrows could be entered.  I know input was solicited a few weeks ago but I missed out on that.

HUGE thanks to Stu!

I just spec'd and cut some aluminums for a Kodiak hunter using the calculator, and have it pretty well bare shaft tuned to 20+yards. As good as my form will allow anyway. This is a very handy tool, and being newer to trad, it saved me alot of frustration I've had in the past.

I would definitely second checking the strikeplate/centercut thickness. It seems to make alot of diff in dynamic spine after the arrow is selected. Its also quite easy to manipulate to help tune the bow to the selected arrow.

Best Regards,

Brian

QuoteOriginally posted by Bow Bum:
......I would definitely second checking the strikeplate/centercut thickness. It seems to make alot of diff in dynamic spine after the arrow is selected. Its also quite easy to manipulate to help tune the bow to the selected arrow......

Best Regards,

Brian

Bingo! Excellent advice right there!