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Extreme Reflex sinew backed Juniper Bow

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pierce_schmeichel:
It came from the top of the branch. Also I found on a site that the compression strength of juniper is about 6340psi and comparatively osages compression strength is 9380psi

But where juniper has an advantage is in its specific gravity which is about .44 and osages is about .75
That's a pretty significant difference. Now I don't know if the loss in specific gravity compensates enough in speed or not though, but I have seen and made some sinew backed juniper bows that are proportionally more efficient than that of osage.

willie:
from topside  seems traditional if I remember correctly an old study.  the bottom side has the "compressionwood" which can cause the drying problems, and as far as I can tell with other conifir bow woods, offers no performance advantage except durability.

good luck!

pierce_schmeichel:
As I understand it the sinew does not take any of the compression off of the belly it just shifts where the tension is. It takes the tension off of the wood putting it into more compression. But as the bow is bending into reflex it does take the compression off of the belly in the reflexed position but as the bow bends forward its going to be under the same if not more amount of compression as if you didn't reflex it at all.

So the goal behind the extreme reflexing with the sinew is to put that sinew under more tension, taking advantage of the elasticity of the sinew more.

But yeah idk about that sapwood being better under compression. I have heard from others that the heartwood is better and in my experience the heartwood has been better in compression because it's a little more rigid, conversely, the sapwood is better in tension. Although I have noticed that the heartwood shrinks much more than the sapwood as it dries.

Gordon:
Good luck tillering that thing.

RyanY:
Looks kind of narrow. Good luck!

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