force-arrows for my FG-Model

Hi,
I want to implementate force-arrows, which show the direktion of all attacking forces an moments. For that I created a force-arrow with blender. Now I want to scale this arrow depending on the Value of the forces and moments. Is here somebody who can tell me how to do that? I know, that there is a "scale"-command for xml but I do not understand how it works.

Timo
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