Author Topic: Black Bamboo - Purple Heart - Osage Orange Carriage Bow  (Read 2683 times)

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Offline Lehtis

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Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« on: December 16, 2022, 10:40:08 am »
Snowy Greetings from Finland.

Got to start this project because of my previous bow broke after couple of thousands arrows; itīs black bamboo backing broke. Anyway, I stubbornly wanted to use black bamboo again for this new takedown bow to be able to travel easier to England next February to sling arrows in IFAAīs Indoor World Championship Competition.

So, I chose black bamboo for back, purple heart for core and osage orange for belly and glued them to reflexed stave with Smooth-On EA40. Then I cut the stave at itīs mid point and fitted take down sleeves on the halves.


Offline Lehtis

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #1 on: December 16, 2022, 10:53:47 am »
Then scraping and sanding as usual to achieve proper tiller... until in the final end the difficulties started: I heard an unpleasant "crack" caused  by popping splinter from lower limbīs bamboo back. Looks like that bamboo is not good at tension.

First I almost gave up but on next morning I diceded to try something new I have not done before. I carfully added some epoxy under the splinter, squeezed it down. The next step was to glue a moistened rawhide patch over the splinter area with TiteBond III. When the patch was dry I carefully sanded both limbs and covered them with rawhide hoping the best. When dry more sanding to remove excess TB III and back to tillering. Surprisingly no new explosions and the tiller and pounds were as before the crack.


Offline Lehtis

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #2 on: December 16, 2022, 11:03:47 am »
So, it looks like the rawhide patch and backing saved the bow and I was able to finalize the bow by sanding and shaping the nocks and installing the arrow pass; all water buffalo horn. Then some one hundred arrows without problems and I was ready to coat the bow. First two layers of stained wood wax to cover the rawhide and visible bamboo at sides. Then several layers of TruOil, leather handle and some more TruOil and the bows was ready. The string is polyester (16 strands of BCY 55, to meet IFAAīs rules) from the earlier broken bow. Some more shooting and the bow is still alive.

« Last Edit: December 16, 2022, 11:15:52 am by Lehtis »

Offline Lehtis

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #3 on: December 16, 2022, 11:06:12 am »
The bow is 71" long ntn, draws 80 lbs @ 28" and got name "The Leatherback" for obvious reason.

... and some more pics ...


Offline superdav95

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #4 on: December 16, 2022, 01:23:43 pm »
Gorgeously done.  Good save.  That black bamboo is hard stuff.  Good luck at your competition. 
Sticks and stones and other poky stabby things.

superdav95@gmail.com

Offline Hamish

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #5 on: December 16, 2022, 07:31:10 pm »
+1 on a good save. I like your attention to detail in your craftsmanship.

Offline Selfbowman

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #6 on: December 17, 2022, 10:32:56 am »
I have some black bamboo myself but have been reluctant to use it because I heard it splintered easily. That’s a beauty though. Arvin
Well I'll say!!  Osage is king!!

Offline IdahoMatt

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #7 on: December 17, 2022, 11:53:29 pm »
Nice recovery.  Looks awesome.

Offline Pappy

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #8 on: December 18, 2022, 05:21:00 pm »
Nice save, beautiful bow. :)
 Pappy
Clarksville,Tennessee
TwinOaks Bowhunters
Life is Good

Offline M2A

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #9 on: December 22, 2022, 08:45:16 am »
Real classy looking bow. Congrats on getting a working piece out of it. Good luck at your shoot.
Mike 

Offline SteveT.

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #10 on: December 24, 2022, 12:32:45 pm »
I cannot be sure from your picture of the black bamboo, but it looks to me like what we call "poppyseed" bamboo. In the past I have harvested all my bamboo from a stand of Madake bamboo ,used for making Yumi's, and bamboo composite bows. Amongst the culms, there were some which had a fungus growing on it, which looked like poppy seed. It is a valued material for making special bows, but only used on the belly side. It is not good in tension. Your black bamboo could be a different variety, as there are so many varieties of bamboo. There are also many other factors which could cause the bamboo to lift like that. Moisture content, how the bamboo was dried ( in a kiln vs. slowly drying in the sun over months) and how thick the backing is on your bow. I prefer to make mine as thin as I can, and take it to knife edge thickness when gluing to the back of the bow. Your bow is beautiful and I really like the combo of purpleheart and osage. Creative way to save the bow. Best wishes.

Offline Lehtis

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #11 on: December 25, 2022, 01:02:44 am »
I have no real information about the species and origin of this bamboo; ordered it from Denmark. Looks like they have some mold or fungus because of their inner surface is a bit grayish/blueish. Anyway, Iīve made two well performing one piece longbows (78 lbs @ 28") from two of the best black bamboo slices I got but both of these takedowns have had problems showing splinters and the first one is currently non-shootable. Actually, I have plans to sand the black bamboo backs away and replace them with common moso bamboo. A bit thinking required how to secure the bamboo slice ends near the takedown sleeves. Nock ends are easier. To be seen next January.

Offline Lehtis

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #12 on: January 01, 2023, 08:54:54 am »
The bow with rawhide backing seemed to work fine... but after some time it started to make tiny noices during drawing. Propably TiteBond III cracked on hard bamboo back. So, I decided to rasp and sand the backing and top layer of black bamboo away; some 1/3 of the bambooīs thickness. Then thin moso bamboo slices on with SmoothOn EA40. Letīs wait and see what comes out.


Offline Lehtis

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #13 on: January 02, 2023, 11:08:19 am »
Both "Momīs Chopping Board" and "The Leatherback" (now ex- ) with new moso bamboo backs. Nex week end, hopefully, some scraping, sanding, tiller and poundage checking. Letīs hope the best.

Offline superdav95

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Re: Black Bamboo - Purple Heart - Osage Orange Carriage Bow
« Reply #14 on: January 02, 2023, 11:10:45 am »
Some good progress there!  You’ll be happier with the mosso I believe. 
Sticks and stones and other poky stabby things.

superdav95@gmail.com