2.9. Masses
Here you can set the mass of the arrow as well as some other optional masses.

Figure 17. Mass properties
The properties that can be set here are
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Arrow: Mass of the arrow
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String center: Additional masses at the string center (e.g. serving, nocking point)
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String tip: Additional masses at the ends of the string (e.g. serving)
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Limb tip: Additional masses at the limb tips (e.g. tip overlays, extending nocks)
Only the mass of the arrow is required. The other ones account for optional weights at various points of the bow and may be set to zero if not needed. Masses in general only have an effect in dynamic analysis.