What's the purpose of notches spaced all along a blade ?

What do serrations do?

The let you pack more blade length into a smaller space. They're also better at cutting some materials and worse or equal at cutting others.
 
Blacplastik said:
So what are the positives of serrations on a knife other then it being able to cut a longer amount of time before sharpening?
What can it do that a plain edge knife can't.
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Basically, the drag the material to a single point when performing a cut, especially a draw cut. A karambit/ hawkbill is a good representation of that as the knife is basically one big, long serration in terms of the cutting edge.

I find they work best on materials that are flimsy, or not stiff, and have no backing to cut on or against like rope, thicker paper, plastic bags, etc.
 
I finally located the video of the weird notch knife in action trying to slice paper . Skip to ~6 min .
Guy is speaking Russian (or similar) but mine is too rusty to glean any meaning .
 
This one ^^^ does not seem to be in any great demand . Up for auction recently , failed to get any bids at <$16 and had to be relisted . I'm still curious , but not real tempted . OK , somewhat tempted ! :rolleyes:
 
That paper cutting video (6 minutes in) tells the tale, doesn’t it! A series of sharp sections separated by blunt choils seems like it is worse for every common task than the edge without the notches would be.
 
Bill1170 said:
That paper cutting video (6 minutes in) tells the tale, doesn’t it! A series of sharp sections separated by blunt choils seems like it is worse for every common task than the edge without the notches would be.
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Yeah , that's my take from the video . A real puzzler for me . Maybe supposed to dig in and tear , but why ? o_O
 
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