What is purpose of fullers on blades?

[Jim McDougall]

Originally Posted by motan

Sorry David but you misunderstood me. Naturally, there is no reason to test the "blood grooves" theory in practice because it just doesn't make sense in the first place. I was talking about something else. I presonally don't think fullers reduce the resistance to stabbing. However, they can, at least in theory, reduce the resistance to pulling out the weapon AFTER a stab if it needs to be withdrawn quickly. Outer pressure should push the flesh onto the blade and the vacuum created by pulling may resist it. Fullers can relieve this vacuum by letting air and fluid IN. This is however all theory. I know these forces exist but I have no idea if they play a role in practice.

Outstanding riposte Motan!!!!
And very well explained......very much enjoying the discussion and elaboration on dynamics and physics here on this topic.