stack and taper

[harry 62]

I need some help on stack. I am going to build a mid 40s 60 " one piece recurve. I would normally use .260 but end with .002 taper. I have been reading on here about using .001 or parallel for a more stabil limb at lighter poundage.The bow will be semi static the hook without the extra tip reinforcement. 22" riser limbs tapered from fadeout to tip.

[bwatters]

The latest off my form is 0.245" stack 0.001" taper with 22" riser gave 40 pretty much spot on.

I think 0.255" or so should get you in the ball park.

[Kirkll]

I can't help you on stack height. The shape of your limb, and limb pad angle will effect your stack height too.

But... the .001 taper rate will help out torsional stability a lot. Once you get below 40# go to a parallel, and 30# a reverse taper. Nothing worse than building light weight limbs that want to go sideways just looking at them wrong. Kirk

[Crooked Stic]

Same form just changing taper 255 might be a bit heavy and use some stable core to.

[harry 62]

do you count the .015 stable core in your stack or is it stiffer like carbon. I am having trouble with going from .002 to.001 making the middle and tip .020 and .030 thicker. Better a little heavy than too light.

[Crooked Stic]

.stack stays the same just .015 less core lam and stablecore in its place.
I recently got some .019 woven carbon from overseas that can be used like stable core after you ruff it up so far the end effect seems much better than stablecore. I am using it in the trade bow.

[Longcruise]

Stic, do you have a picture of the woven?  How do the edges hold up when you handle it?

[Crooked Stic]

The stuff I have  has resin already.. from a guy on FB that posts in The Bowyers Corner. Mark Tom in China I think. Even  with shipping less money than anything here..
It comes  with both sides slick so I had to sand it with 120 grit. I can try to PM  you the info if you want.

[Longcruise]

Please do

[Kirkll]

.stack stays the same just .015 less core lam and stablecore in its place.
I recently got some .019 woven carbon from overseas that can be used like stable core after you ruff it up so far the end effect seems much better than stablecore. I am using it in the trade bow.

Id be interested in where you ordered that .019 bias weave carbon, and the price.  I've got some ultra light draw weight limbs that need some extra stability.  That might do the trick.     Kirk

[Crooked Stic]

Kirk if you are on Facebook get on the Bowyers Corner and look for Mark Tom.

[Stagmitis]

$30 per 72"x1.5" Either .19 or .39 thickness- No shipping for 30 pieces or more- About $40 shipping to my addy in Md

[Crooked Stic]

He message me today with tracking #. I got 4 1.5 and 4 1.75 plus shipping was 200 to IN.

[Kirkll]

Thanks Mike.
Just got an email this am from Mark in China. Pretty quick response too.

i'm looking into getting a small order to try this stuff.... 

Are you putting this closer to the belly or the back for stability? I was thinking of going .030 glass belly and using the carbon against the bell glass for best results.    Kirk

[Crooked Stic]

I put mine under the front veneer.Only one so far so cant say where it will be best at yet. I can tell quite a bit of difference between that and stablecore just by twisting on the limb  This what it is in got a good amount of hook.

[Crooked Stic]

Got this today. pretty quick this time.

[Jeff Freeman]

Looks great,how thick? JF

[Jeff Freeman]

Got this today. pretty quick this time.

Can you put on the outside and no glass over it?

[Longcruise]

How is in terms of consistency of thickness?  Sure looks good.

[Crooked Stic]

I have had no trouble with it being consistent. My trade bow has it in the limbs and was tiller dead on both ends right out of the form. And a lot more stable than stablecore.8 pieces with shipping from China $200.