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51
Bows / Re: The best shape for a reflexed bow?
« Last post by Tuomo on December 10, 2025, 02:29:11 am »
Here are the results I got from VirtualBow. Remember, no set, idealized situation, although 5 % damping in the model, 10 gn/lbs arrow, every reflexed bow’s tips are 100 mm (4") behind the belly side of the grip (thus about 70 mm from the back).

The deflex–reflex design performs well, while a handle-reflex design does not. The reason model 4 performed poorly is that the recurves didn’t open fully even at full draw; the string was still almost in contact with the base of the recurves.

Willie: Yes, in VirtualBow the ability to visualize the stress curve is a great feature. I also like the curvature graph—you can see exactly where the bow is actually bending.
52
Bows / Re: Snake bow
« Last post by bentstick54 on December 10, 2025, 01:21:02 am »
Beautiful looking bow. Great job on it Arvin. Looks like a December bow of the month to me.
53
Shooting and Hunting / Re: First deer with my Osage bow
« Last post by Pappy on December 09, 2025, 11:43:54 pm »
Nice buck, congrats. Pappy
54
Bows / Re: Snake bow
« Last post by sleek on December 09, 2025, 08:57:43 pm »
Thats a really nice looking bow. Perfect amount of wiggle to it.
55
Shooting and Hunting / Re: First deer with my Osage bow
« Last post by Piddler on December 09, 2025, 08:39:42 pm »
Congratulations on a nice buck.
Piddler
56
Shooting and Hunting / Re: Another good day
« Last post by osage outlaw on December 09, 2025, 06:53:03 pm »
You are knocking them down this year Pappy!   (SH) :-D
57
Shooting and Hunting / Re: First deer with my Osage bow
« Last post by Pat B on December 09, 2025, 06:09:38 pm »
Beautiful buck and nice shooting.  :OK
Welcome back.
58
Bows / Re: Snake bow
« Last post by Selfbowman on December 09, 2025, 05:57:54 pm »
35@24 one coat true oil . Couple more costs and off to my leather man for the handle rap.
59
Shooting and Hunting / First deer with my Osage bow
« Last post by Woody roberts on December 09, 2025, 05:01:11 pm »
Wow! I’m glad to see this forum up and running again. Got my first deer with my Osage bow this year. My old Sudbury still shoots good and has put a few on the ground but I thought I’d give the Osage a chance. 22 yds centered the heart. A little farther than I prefer but I take the shots they give me.
60
Bows / Re: The best shape for a reflexed bow?
« Last post by willie on December 09, 2025, 03:28:31 pm »
Quote from: Tuomo on December 09, 2025, 06:58:18 am
So more taper → more evenly distributed stresses and lighter limbs.......
I tried my D/R model using a 0.010 taper (more taper)......  the maximum strain values were higher.
With less taper (0.006).....the maximum strain values were slightly higher.
Was this with the same width width profile? A limb can be made stiffer, or for the sake of this discussion, less stressed, anywhere along the limb where the stresses are maxing out.
Quote
In VirtualBow, I get maximum speed and minimum strain when stresses are distributed as evenly as possible (within reasonable limits, of course).
In real life, we cannot “see” strain values, so it’s difficult to tiller perfectly, but we can learn a lot by using programs like VirtualBow.

visualing the stress curve with the program, is to me, its strongest feature.

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The question is that how do you optimize the tiller? What is the parameter which is altered? More bending towards the tips, or handle? Something else?

In theory (and in generally accepted widsom), bend towards the handle does the most for energy storage. So for me,  it becomes where a designer would seek to place the highest stress on the curve, but also keep it as level as possible without the stress curve peaking too much, finally deciding where along the limb length to have the stress curve begin its downward slope towards the tip where stress and bend is zero.

Looking foreward to your presentation!

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