Main Discussion Area > Flight Bows
Arvins 62" osage design
Selfbowman:
This is going to be interesting. I see all this information and understand some. I will look at the pictures real close! The challenge for the designers is not only the design but getting the builder to understand it. 🤠🤠🤠request for information ( RFI) will be present I’m sure.🤠🤠
willie:
--- Quote from: Selfbowman on December 08, 2024, 10:38:02 am ---If I understand you correctly there is no width requirement in flight rules.
--- End quote ---
No width requirements that I know of, but I have not looked at the rules lately. Your stave might limit the width tho, and dictate some design decisions.
Most people have a back profile in mind and cut the width to a pyramid, semi-pyramid or more of a straight limb when they set out to build the bow and then tiller to bend profile by removing thickness.
Edit: setting widths has been added to the first post..
With this program we can define a back shape and adjust the thicknesses to make it work, or vice versa, define a thickness taper and adjust a back proifile to suit. I can post examples of any other design offered.
With Virtualbow, once a profile, either a back shape or a thickness taper is tried, the other can be adjusted and the resulting stress plots drawieghts and bend profiles can be generated by the program.
So long as the stresses shown in the stress plots do not exceed the limits of the materiels, any configuration of limb can be built without set.
sleek:
Something i didnt see mentioned is are the tips stiff or working? If stiff, how long is the stiff portion?
willie:
--- Quote from: sleek on December 11, 2024, 06:47:30 pm ---Something i didnt see mentioned is are the tips stiff or working? If stiff, how long is the stiff portion?
--- End quote ---
Arvin said he wanted the last 3-4 inches to not bend. I dont see much bending in the screenshots just now added to reply2
should they be stiffer?
To help see the tip stiffness, I modified the design to let the progran show a straight tip. They are kept at the same stiffness. The bow lost 3.5 lbs when the tips were straightened, so the inner limb was thickened slightly to bring the bow back up to the same draweight .
The maximum stress without the flipped tips is, 8% lower than with. The 8% reduction will also allow us to draw the bow 2 inches more if one wants to bring the bow up to the original stress level. Straightening the tips makes a noticable change in the force draw curve. It shows as a lower "hump" in the early draw portion, and a slightly noticable difference all the way out to 25"
f1width(9).jpg shows the force draw curve with 1.5" recurved tips.
f1width(14).jpg shows the force draw curve for the modified limb without the recurved tips.
f1width(12).jpg is the bend shape of the straightened limb,
Note: I have edited this post and some posts above for completeness
sleek:
How wide will it be out the fade, and at the last part of the bending limb before it gets stiff?
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