2024 Bow Swap Progress Thread - Closed

[Mo_coon-catcher]

Add me to the vote for the rosewood. I love the contrast the maple burl provides but I like the colors of the rosewood a bit better. It’s close though.

Dang that sucks she blew. I missed it, what was the back layer? Since it didn’t blow until far in the  draw I wonder if going 1/4” wider and a smidge thinner with the combo would hold without a significant drop in performance potential.

Kyle

[Mad Max]

Looks like Boo on back, maple, boo , maple, and boo belly?
 

[Crooked Stic]

The light overlay I like. Noah.
Getting pretty close. Got it pulling straight today needsmore sanding and tip shaping. I am not even gonna show you all how I ruff out the tips with my spindle sander. You might say one slip and it's done for 

[kennym]

Both overlays will look great, I'm leaning toward the light colored ones.  I'm the only one so we know who is getting that bow!!

[Buemaker]

Looks very nice mr.Stic. I have one from you from a previous trade and would not mind this one too, so just ship it over.

[Crooked Stic]

 

[Mad Max]

Nice stic

[Smguinnip]

Received a shipment from Missouri today, so now it’s time to play catch up.
Noah70, if that bow is heading my way, I’d take the burl even though they both look really nice.

[kennym]

Stic, I like how you did that riser.

[Jon Lipovac]

Kirk,
Sorry that sucker blew up but entertaining at least. 

I'm also experimenting with the fossilized bamboo. My thoughts so far:
-it is definitely stiffer than regular action-boo
-If done some rudimentary spine tests with it and it does not bend as easily and did not take a set like the action-boo did
-looking at the way the grain splintered on your failed limb it seems the grain is really held together with the resin and does not have the long running grain of natural bamboo making it more brittle?

I just built a set of take down limbs with a new to me form and missed weight terribly. I dropped .010" in stack weight and came in at 75# vs the 45# I was aiming for. Some other factors that I'm sure added to the weight was the use of very stiff butt and tip wedges. I used Wenge on these limbs which were super stiff. I also used black Gordons glass on the belly which I rarely do. I've heard that adds some draw weight compared to clear glass.

I've never built wood limbs, but I usually see folks building tri-lambs. With those you only have 2 epoxy joints vs the 4 epoxy joints in your build. I'm wondering if it creates more shear force in the stack since I would assume that the epoxy line neither compresses or stretches with tension. I assume a thinner lamination with shear forces on both sides, working in opposite directions might not be able to absorb those forces? I don't know. Interested to hear your thoughts as you work through it.

Here are pics of my limbs with a 13.5* limb pad 75#@28 and another with a 18.5* limb pad 67#@28
I like the way they are bending though.

[Kirkll]

What is your taper rate on those limbs Jon? and your wedge configuration and length?

You may want to try those out at about 16 degrees and check the string tension. Have you ran an in line scale and played with different string lengths yet?  Probably not , with those heavy limbs.

Once you get a set within 50-60# You can start tinkering with different limb pad angles and preload adjustments with different string lengths before mounting them on a block and measuring back to get your brace height established.....

That is definitely the right way to prototype limbs. good looking adjustable riser there.

I think you may be right about this fossilized bamboo having shorter woven fibers vs vertical grain with elongated fibers...... But..... Under glass this stuff has proven to be excellent material so far and has decent test results vs the action boo i've used for so long.        Kirk
 

[Crooked Stic]

So what exactly is meant by fossilized. It sounds cool I guess.
So what you like about the riser Kenny?

[kennym]

Like the pieces on back and belly
Looks cool

[Jon Lipovac]

Kirk,

Old form
Butt wedge 5/16-0 in 11.5"
Tip wedge .050-0 in 6"
Laminations 30" (Usually trimming off 1.5"-2" of the tip)
Typical stack (.245) for 45@28-62" at 13.5" on a 18"riser:
Clr G  .040
Ven    .020
A-boo .060 PAR
A-boo .073-.001 TAP
SC      .012
BG      .040

New form (These heavy limbs)
Butt wedge 5/16-0 in 11.5"
Tip wedge .030-0 in 9" (wanted the tip wedge to thicken the base of the curve a little more for stability)
28" laminations
This stack (.235) came in at 75@28-61" on a 17" riser
Clr G   .040
Ven     .020
F-boo  .055 PAR
F-boo  .068-.001 TAP
SC      .012
BG      .040

The new limb profile sitting above the old limb design in pic.
I'm just realizing in writing this out how much I shortened the working limb from 12.5" to 7.5". This may have been a factor 

I do need to get a string tension measuring system going. I've heard you talk about that since I've started, and it make sense to me. These limbs have a crap ton of tension as I've never had a bow so hard to string and have such a high note when the string is plucked.

I think you may be right about this fossilized bamboo having shorter woven fibers vs vertical grain with elongated fibers...... But..... Under glass this stuff has proven to be excellent material so far and has decent test results vs the action boo i've used for so long.

That makes me wonder if your limb didn't let go on the Belly as there wasn't any glass holding it down from buckling under compression. I think the glass spreads out the pressure over a longer surface area and won't allow a pinpoint fracture or failure.

[Buemaker]

Riser strips glued in place and tip overlays.

[Crooked Stic]

Jon I say that working limb length was a real big factor.

[Mad Max]

Always nice Bue

[Kirkll]

So what exactly is meant by fossilized. It sounds cool I guess.
So what you like about the riser Kenny?

This stuff is woven bamboo strands that are impregnated with resin and pressed together under pressure and cooked like the carbonized a boo was tempered. So it’s a solid bamboo product when it’s done, and retains a lot of the bamboo characteristics, but it’s much harder being resin impregnated. Think about your stabilized wood…. The only down side to this material so far I’ve seen is the mass weight. The vertical grain Aboo was considerably lighter…. But…. You don’t need as thick of lams using this stuff either and it has higher tensile strength, so I’m thinking it’s a push….   Kirk

[Crooked Stic]

I know zero about it but by looking at your broken limb I am guessing it's gonna be better backed with glass.

[dbeaver]

Tonight I got the width profiled and the bow has been cut to length.  I also took a sneak peek at the spalted tamarind veneers on the belly.