Cottonwood
Roadster#433, Model S#S37
Also you need a supercharger to be within a circle from another supercharger. Not just have circles intersect.
See above. By setting R to 60 miles, then you get an intersection of the circles when the distance between Superchargers is less than 2R. If I set R to 60, then 2R is 120, and an intersection means the straight line distance between Supercharger is less than 120 miles.
As I said before, for an 85, set R to 85. Simple memory items, not exact! Use http://evtripplanner.com/planner/carview_beta/?id=uda in "advanced" mode for better estimates.