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31" - to draw, or not to draw

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Badger:
   I would stop right there and call it a 28" draw bow, if you bring it out to 32" I think the weight will drop considerably and very likely break, Regardless still a very nice bow. Steve

skerm:
Yes, you are right, it seems I have reached the yield strength of this yew. Thanks again for your advice, I'll keep this procedure in mind! I started debarking a thicker yew branch and will try again. The sapwood is about 1/4" on this one, so that's better, but the outermost ring is so thin that I can remove it with a single pass of the scraper.

Daniel

Hrothgar:
Nice looking bow, excellent tiller.

Rod:
A sapwood bow would be weak, be nice to actually see some heartwood on the next one.

Rod.

bow-toxo:

--- Quote from: skerm on March 22, 2010, 05:56:09 pm ---Hi!


I only scraped a bit on the right limb, otherwise it is unchanged since the piking, so it is still thick at the tips. I measured the draw weight at various draw lenghts and extrapolated the draw weight at 31". This looks reasonable.



Now the question is what are the chance of the bow surviving the draw to 31"? The decision was more or less made when I sawed of the 8", but I was still a bit reluctant to draw further than in the picture. What do you think?

Daniel

--- End quote ---

 I go for the medieval standards whenever possible. By that measure a 31" arrow would take a 71" bow     [between nocks] for normal shooiing, 3 1/2" less for a flight shooting bow that would have a limited life. Those would be bows tillered to an arc of a circle, without thick tips. For a 100 pound bow, there should be no problem. There ar two possibilities for sapwood. One is 'chasing a ring' which gives you bow tips that are mostly sapwood, the other [my personal preference] is to keep sapwood at 1/4 to 1/3 the thickness through the entire bow. If you want the thinner tips that were thought to increase cast, I suggest shooting for a while first.
                                                                                       Erik
 

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