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Bows / Re: The best shape for a reflexed bow?
« Last post by RyanY on Today at 08:26:04 pm »
Quote from: willie on Today at 03:38:59 pm
@ ryan, virtualbow outputs a graphic view as if on the tiller tree that one can reference for any stage of the draw when making tillering adjustments.  Selfbowman had acess to a 36" printer and we once worked on enlarging Virtualbow plots to put behind bow when on the tiller tree.

That would be an amazing tool! I keep meaning to play with it but I haven’t gotten around to it yet.
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Bows / Re: Black locusts bow
« Last post by JW_Halverson on Today at 05:23:41 pm »
Quote from: Selfbowman on Today at 02:37:08 pm
Ya JW there is a story about that deer. The first time he was at almost full draw on it when the bow I made blew. He called me said I need another bow Arvin. What happened to the one you’ve been shooting. He told the story and I’m thinking and he wants another one. Ok??? I told him I had one that was probably in the top ten I had made. He drove 170 miles the next day to get the bow. Shot it about 4-5 times and we did some trading and went home with it. So I guess he liked the way the first one shot. The second time the Arvin bow got it done.🤠🤠🤠🤠it’s good to have guys that confident in your equipment.

He'll have more than a few meals in his belly courtesy of that confidence!
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Bows / Re: The best shape for a reflexed bow?
« Last post by Tuomo on Today at 04:02:01 pm »
Quote from: willie on Today at 03:38:10 pm
I am using version 9.1 and do not recall seeing outputs for strain. Are you using a development version to get your strain values?

Yes, I am using a development version 0.10. It has strain-values as an output, and you can give an fixed grains per pound -value for the arrow. It seems that it is also more accurate. Version 0.9.1 gives a bit skewed results.
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Bows / Re: The best shape for a reflexed bow?
« Last post by willie on Today at 03:38:59 pm »
@ ryan, virtualbow outputs a graphic view as if on the tiller tree that one can reference for any stage of the draw when making tillering adjustments.  Selfbowman had acess to a 36" printer and we once worked on enlarging Virtualbow plots to put behind bow when on the tiller tree.
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Bows / Re: The best shape for a reflexed bow?
« Last post by willie on Today at 03:38:10 pm »
Quote from: Tuomo on Today at 07:19:31 am
Here is small comparison made with VirtualBow-program, of short and long bow. Straight, normal front profile, taper rate 0.004 (evenly distributed stess).

I am using version 9.1 and do not recall seeing outputs for strain. Are you using a development version to get your strain values?
When I see such a difference between back and belly strains in your table, I suspect you are using different moe values or thicknesses for the back and belly layers, however the back and belly layers dont appear to be much different in thickness in the pics.
If modeling for basic shape/profile principles, why not just use a single layer?

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Bows / Re: The best shape for a reflexed bow?
« Last post by RyanY on Today at 03:15:48 pm »
I think a common issue with the R/d design versus a recurve is that they’re much harder to tiller. I assume this results in less even strain and a slower bow. Recurves are simple in comparison which may explain the difference by wood bow makers on average. I think it’s also easier to get more total reflex from a recurve than with a r/d bow. Seems like Fiberglass bows that can be designed so close to perfect are closer to what we’d see in a model versus real world averages.
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Bows / Re: Black locusts bow
« Last post by Selfbowman on Today at 02:37:08 pm »
Ya JW there is a story about that deer. The first time he was at almost full draw on it when the bow I made blew. He called me said I need another bow Arvin. What happened to the one you’ve been shooting. He told the story and I’m thinking and he wants another one. Ok??? I told him I had one that was probably in the top ten I had made. He drove 170 miles the next day to get the bow. Shot it about 4-5 times and we did some trading and went home with it. So I guess he liked the way the first one shot. The second time the Arvin bow got it done.🤠🤠🤠🤠it’s good to have guys that confident in your equipment.
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Bows / Re: The best shape for a reflexed bow?
« Last post by Badger on Today at 01:36:34 pm »
Quote from: simk on Today at 01:03:05 pm
to not confuse the thread we might stay a bit closer to the topic. The simple ( ;D) question actually seems: How and why does the sideprofile affect energy storage?

  Lower string angles and preload from reflex is the simple answer. The entire limb responds to it's relative position to the string. Lower string angles allow for more weight up front because they build weight slower during the draw.
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Bows / Re: The best shape for a reflexed bow?
« Last post by simk on Today at 01:03:05 pm »
 to not confuse the thread we might stay a bit closer to the topic. The simple ( ;D) question actually seems: How and why does the sideprofile affect energy storage? 
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Primitive Skills / Re: A simple leather project
« Last post by White Falcon on Today at 12:09:28 pm »
I like it !
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