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Bows / Re: Reflexed Ocean Spray
« Last post by Doug509 on Today at 01:17:26 am »
Pappy thanks for your insight and encouragement. I removed the spongy center pith handle to tip reducing the draw weight a bit more.  Then shortened limbs to 64" NTN.  Final draw wt is 42# at 28".  Tiller isnt perfect but Im calling it done.  Ill do some light sanding, leave the bark on and seal with tru oil.  I will say ocean spray has amazing flexibility.  Ill be looking for more staves this winter.  A 1.5" diameter tree would be perfect.  I have some shafts harvested ready to make arrows.
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Primitive Skills / Re: A simple leather project
« Last post by bjrogg on December 11, 2025, 10:49:20 pm »
Thanks white falcon, I’m glad you like it

Bjrogg
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Bows / Re: The best shape for a reflexed bow?
« Last post by RyanY on December 11, 2025, 08:26:04 pm »
Quote from: willie on December 11, 2025, 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 December 11, 2025, 05:23:41 pm »
Quote from: Selfbowman on December 11, 2025, 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 December 11, 2025, 04:02:01 pm »
Quote from: willie on December 11, 2025, 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 December 11, 2025, 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 December 11, 2025, 03:38:10 pm »
Quote from: Tuomo on December 11, 2025, 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 December 11, 2025, 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 December 11, 2025, 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 December 11, 2025, 01:36:34 pm »
Quote from: simk on December 11, 2025, 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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