Well they say a picture is worth a thousand words so,
Pretty, light, fast, sharp, easy to change the balance. The Kopesh is a nasty piece of work. They can be hard to make well. Also don’t expect it to go toe to toe with anything heavy like a katana or a claymore. This is the kind of sword you use to counter a rapier or foil. It is a good blade where precision movements of the blade is more important than overall crushing damage. This sword is good at getting between heavy plate armour and can be used in for thrusting as well. This post is more about a reminder that other styles of blades are out there and are being overlooked.
Now to the concept of a good cutting sword with two edges I like to look to the early bronze age swords found in the roman empire.
This sword has a leaf shape and is wider two thirds up the blade than anywhere else. This edge design facilitates the user deflecting a heavier blade along the edge and away from the defender. It is also a great in close slasher. Due to the width of the blade near the tip the user cant pierce with it as well as some blades, but that is not what this blade is about. I perfer more of a bulge than is displayed in the picture and the more you exaggerate the bulge the better the blade gets at cutting. Of course there is such a thing as too much. Personally I would not want to see more than a 3:1 ratio between narowest (near the hilt),and widest (near the tip but not at it), part of the blade. And of course rivited full tang on both.
As for the forging details, I am still learning myself sorry.

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If I die, I have to go before him, and he will ask me, "What is the riddle of steel?" If I don't know it, he will cast me out of Valhalla and laugh at me. That's Crom, strong on his mountain!