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Korean horn bow dimentions

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bownarra:
The outside of the boo should be the belly of the core. A crown is no problem on the back of the assembled core - indeed most hornbows are built this way. The thick sinew 'edges' help the bow.
Thickness and width taper are established once the horn is glued to the assembled core. Unfortunately this is done by feel so I have no definite numbers for you.
If you can get 33mm width in the main bending section then taper to around 27mm where the tips are spliced.
Yes situate the nodes in the v-splice. Yes the 12 inches includes the splices. Handle splice should be 4 - 5 inches and tips 2 1/2 to 3".

Jakesnyder:
Thanks for the help bownarra!
So as I glue up the horn to the boo and clamp it down will the horn pull up on the sides to fit the crown of the boo? After the horn is glued up and dried how much can I stress the bow to get the tiller right before sinewing?
Also does it matter about the grain orientation for the syhias? As long as its strait grain the whole way through it. Do you know what I mean? If your looking at side of the syhias it would be bias grain(you could see the growth rings) and the back side of the bow you would have a solid growth ring the whole way up the syiah?

bownarra:
No problem :)
No make the core/horn joint flat. If you try to bend the horn it will get belly cracks. It can be done but I wouldn't recommend it to begin with.
Good question - not much but you can bend it backwards and from that shape you can determine the bending sections taper.
No the grain can be any orientation for the tips as long as it runs the full length. Remember you can also laminate them from thin pieces.

Jakesnyder:
Can I completely flatten my bamboo? I would have to plane the outside of the bamboo to make the crown flat to meet with the horn. Is this an issue? So can I remove material from both sides of it to get it completely flat? Its thick enough to do that.

bownarra:
Yes no problem to flatten completely.
Bear in mind that when it comes to gluing the horn you want the core as stiff as possible because it acts as a form for the softer horn. Eg. the horn will follow the shape of the core and it is easy to twist the core during glue up.
You can also prepare the core then glue on a sacrificial piece of wood to the back of the core to stiffen it, glue the horn, then remove this piece when you come to shape the core prior to sinewing.

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