SPEEDOMETER
#8
Yes, I thinks Charlie B. has it nailed! And I'm pretty sure that Pi = 3.1417

But for any of that diameter and circumference stuff, I have to refer to my "Machinery's Handbook" ... the book that is so important, there's a drawer sized just right for it in the middle of my Kennedy Machinist's Tool Box that got when I first graduated from design school to keep all my model building tools in, including my copy of the handbook, I mean, why not ... it's got its own drawer!
biL

Lehigh Susquehanna & Western 

"America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves." ~~Abraham Lincoln
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