Main Discussion Area > English Warbow
bow building grain orientation
nidrinr:
If the wood got compression marks and had to retire from 65#@32", 72"ntn bow, I'd just recommend you heat treat the belly even with 3" extra if you're going to aim over 100#. Don't you have access to some good boo?
DarkSoul:
A polyester fabric is not a good backing. If you want to use a cloth/fabric backing, it needs to be linen or silk.
Nidrinr, if the previous selfbow developed compression chrysals, that indicates a compression weak wood, right? I would therefore think a bamboo backing may stress the belly even more. I think bamboo is probably too strong for eucalyptus. You could trap the bamboo though, and keep the belly flat and wide.
CelticArcher:
--- Quote from: DarkSoul on April 28, 2011, 09:28:18 am ---A polyester fabric is not a good backing. If you want to use a cloth/fabric backing, it needs to be linen or silk.
Nidrinr, if the previous selfbow developed compression chrysals, that indicates a compression weak wood, right? I would therefore think a bamboo backing may stress the belly even more. I think bamboo is probably too strong for eucalyptus. You could trap the bamboo though, and keep the belly flat and wide.
--- End quote ---
thanks for your input!! i'll try to find some linen at a craft store somewhere. and thanks for the tips on shaping the profile flat. looking at my previous attempts at bowyery, the oned that developed compression fractures have all had rather round bellies, so i'll make sure to keep this one flat as possible :)
bow-toxo:
--- Quote from: CelticArcher on April 21, 2011, 03:19:07 am ---Hey guys :)
This is my first post. I'm interested in building medieval style warbows.cheers guys :)
--- End quote ---
You said you were“ interested in building medieval style warbows”. If you are actually serious about that, you might first gather some info about medieval warbows as a start. Seen from the end, the grain would be parallel to the back of the stave, and of course not run out the sides as has been said. I do not mean that end grain is not OK running from back to belly, but it is not medieval. Apart from the naturally grown yew sapwood, here is NO known backing for a medieval warbow, not paper, not fabric, not snakeskin, not bamboo, not sinew, nothing .If anyone has evidence to the contrary, let me know. Also, eucalyptus was not used, or even known of. It is true that a flat back will shift compression stress toward tension stress. Of course if you are really not interested in medieval style warbows, you can ignore this post
Cheers for our royal wedding
Erik
.
CelticArcher:
--- Quote from: bow-toxo on April 30, 2011, 01:19:30 am --- You said you were“ interested in building medieval style warbows”. If you are actually serious about that, you might first gather some info about medieval warbows as a start. Seen from the end, the grain would be parallel to the back of the stave, and of course not run out the sides as has been said. I do not mean that end grain is not OK running from back to belly, but it is not medieval. Apart from the naturally grown yew sapwood, here is NO known backing for a medieval warbow, not paper, not fabric, not snakeskin, not bamboo, not sinew, nothing .If anyone has evidence to the contrary, let me know. Also, eucalyptus was not used, or even known of. It is true that a flat back will shift compression stress toward tension stress. Of course if you are really not interested in medieval style warbows, you can ignore this post
Cheers for our royal wedding
Erik
.
--- End quote ---
"Style" can have a number of meanings. Had I said i want to build authentic medieval bows, I would be using Spanish or Italian yew. Do you think i'm stupid or something?? I know that eucalyptus wasn't used; for heavens sake, Australia wasn't inhabited by caucasians in the medieval period. I simply use it because it is what there are plentiful supplies of at the timber merchants here. A medieval bowyer did the same thing, they used what woods were in plentiful supply, be it yew, elm, ash or any other of a number of woods. as for backings, I have read in a number of places that linen was used at the time.
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