I don't truly understand your question. Perhaps one of the knife experts may. The physical laws of our Universe are not suspended when knives are made. Heavier knifes are slower than lighter weight knives. If a large blade, like a khukuri has fullers, it has lightened it's load and maintained much if not all of it's strength. The Kamis know what to do about balance when they have fullers on a blade. The khuks are designed well.
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