Main Discussion Area > Horn Bows
Do you need to have a sinew back?
joachimM:
sinew (sg 1.3) and osage (sg 0.75) have very different moduli of elasticity (low versus high stiffness), and yet if you combine them (without horn) it makes really great bows.
Osage cannot compress the same amount as sinew can stretch, but if you combine them in the right amounts, the forces of compression on the osage will balance the tension on the sinew (plus some tension on the osage's back).
The point is that strain doesn't need to be the same on back and belly (how far it bends, which depends on the position of the neutral plane), only the stress (what force is exerted on each surface).
I suggest you ask Jaap Koppedrayer if his horn-bamboo bows are rubbish or not :P
Pat B:
James Parker built an Asiatic style bow with boo back and caramelized boo belly. That was one quick little bow and pulled, I believe at least 30".
...but again, this thread is specifically for true Asiatic Horn Bows, not wanna-bes.
bubby:
Japp's boo backed composites are longer, 55-60" and have 5" more draw length with sinew back
PatM:
--- Quote from: mikekeswick on June 24, 2015, 03:15:04 am ---Gemsbok only horn bows shoot....well poorly at best.
Horn is 1.3s.g. so adding it to a bow will simply make it slower if the horn isn't used to it's full potential.
Just because bamboo makes great 'self'bows that is not a reason to add horn into the mix. Bamboo just isn't suited to a bow with a horn belly.
Horn and sinew can both stretch/compress about the same amount and have similar resistances to bending - this is what you look for in a well designed laminated bow. Try mismatching bow woods with different properties and see what happens - broken bows or lots of set depending on which way you do it.
Make some and see! ;)
--- End quote ---
As noted Jaap makes them. You're not thinking this through very well.
joachimM:
--- Quote from: Pat B on June 24, 2015, 09:30:30 am ---...but again, this thread is specifically for true Asiatic Horn Bows, not wanna-bes.
--- End quote ---
"all composite bows with bone, antler, ribs, baleen, sheep horn, sinew,bamboo , and/or any ethnographically correct /historical materials will be accepted"
First post in this thread. I can't see what's wrong with discussing the properties, pros and cons of a bamboo-horn composite here.
But in any sense, we're not progressing anymore. It's at risk of becoming an unproductive discussion between believers and non-believers...
Joachim
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