Wait , we do ? Since when ? I knew I should leave the house more often . <| sep |> Actually , curved blades have no more edge contact than straight ones . Or very little , Samurai Swords are curved for entirely different reason . If it ' s curving outward , it has a longer slicing surface . Since our arms move in an arc , it is more effective . That is a common misconception , most people new to swordplay see improvement in cutting with a curved blade vs . a straight one , but that is only because curved blades are more forgiving on edge alignment . The blade isn ' t cutting better , you ' re just screwing up less . There have been a lot of discussing about this over at rswords . If you are interested In this you can get a better explanation there . Curved blades are very effective in close combat . If it ' s curving inward , the blade can be used like a hook cats ' claws are perfect examples of this . Do you mean a Karambit ? I ' ll give you that , it ' s been designed after a tigers claw . But I think daggers referenced here are more like 21 la 3 uproducts 37755 images 19741 K 46 s i k h k i rpanceremonialsworddagger 159 tel 385 . 500 . 750 . jpg ? c 2 . Curvature of that blade would be useful in a defensive , reverse grip style , but I may be biased because I EDC a similarly curved blade . Mainly an al mar warrior .