Wf
Wm
Wb
Dm
Db
Dl
Wl is the simple proportion of Wl/ Dl = Wm/ Dm which rearranges to Wl = (Wm)(Dl)/ Dm
Enter G/Wl Must be less than 1, 0.85 good choice
Enter Rs This is the closest that the blocks of the inner most ring will be to the center