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The best shape for a reflexed bow?

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simk:
Ok, ok, for the scienece we measure  :)

Are the pictures from bows 1, 4 and 6 Tuomo? If so:

Bow 1 angle 52.1 degrees - stored energy 101.3%
Bow 4 angle 53.9 degrees - stored energy 107.5%
Bow 6 angle, 49,9 degrees - stored energy 118%

with bow no 4 I'm not sure weather I measured correctly. Maybe measure from the very tip, and  not the place where the string touches?
do you have the fd pic for the other bows too?

Tuomo:
Interesting analysis for string angle! Let's see what you can get from these. By the way, what is the program you use?

willie:
Isn't it the shallow angle at brace that gives the high early draw weight and increases stored energy?
whereas  excessive angle at full draw leads to stacking or an increase in apparent draw force but  not stored energy?

simk:
Good point willie. when the string touches the bow gets shorter virtually? complicated things. but something happening for sure, you can see that on the chart too. we here check only the angle at fd.
Tuomo, its autodesk fusion - pretty cool software for 3d design. they even had a FEA analysis addon, not for free version tough... :)

willie:

--- Quote from: simk on December 15, 2025, 05:15:36 pm --- complicated things. but something happening for sure, you can see that on the chart too.

--- End quote ---


a compressive force acting linear on the limb in addition to the compression due to bending?
maybe why such designs are more prone to compression failures?

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