[quote=@The World] The overall weight and general area aren't enough. A sword just sharpened and one used repeatedly are different. If the weight is the same but the shape and therefor the location of each gram makes a huge difference. Unless you just swing everything like a baseball bat no matter what it is, then the usable skill is reduced. [/quote] If you did the research on vectors you like to tout, you'd recognize that they can be stabilized on a plane to where the cancel each other out. It's easy to distribute weight equal to another object. [quote=@The World] The only way to do that is to have it equally sharp on the offensive side. That nulls the point. [/quote] Factoring it out is not the same as it being solved. But you can account for air resistance in your development.