Mike,
You can do this on paper if you want. Just draw out the different radius's in 1 inch lengths, then measure the different lengths of the arc's at the same degree of movement, and you will see the longer the shaft the more travel the arm will have at the same degree of movement, and that is what everyone is saying. The longer the steering arm off the steering box shaft, the faster the steering will be.
Hope this helps.
Tom G.