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The graph of a resulting strength of a human hit as a function of muscles engagement is not linear.
For most people it's parabolic /up to the highest point/ with different steepness.
The speed of blades as a function of the strength of impact is not linear two.
But different blades change speed in different way, depending on their structure.
Some have a parabolic graph, some have a hyperbolic graph, all with different steepness too.
If a player with a parabolic graph of strength use a blade with a parabolic speed graph, he will feel it relatively more speedy with weeker hits and/or closer distance, and relatively dead and lacking speed with stronger hits and/or longer distance.
If he play with a blade with a hyperbolic speed graph, he will feel it more linear. The more mirrored are these graphs, the more linear the feel will be.
Choosing the propper blade depends on the style, the initial speed of the blade, the way it changes speed and it's max speed.
With hyperbolic speed graph blades the max speed may not be needed, but it may not disturb the player if he feels good enough with lower speeds.
So, even if we think of lower speeds, faster rated blades are not always to be out of consideration.
Wow; never tought about that - makes sense. Now i just have to figure out if my "muscle engagement" -> "hit power" is hyperbolic og parabolic.