Reichsmarine on Twitter: "Tachi and katana generally differ in length, degree of curvature, and how they were worn when sheathed. A curved and long sword like tachi is the most efficient weapon
Why is the katana (a two-handed sword) the same length as an arming sword (one-handed), and why the nodachi would be a better two-handed sword compared to the katana? : r/SWORDS