Just a thought,  consider making the large circle pass through the centers
of the small circles.

This assumption should make the maths simpler as you need to calculate a
polygon with n sids for n equally sized wires on the perimiter.  This
automaticallty gives the centers of the wires and there diametes (1/2 of the
polygon face).

I think the outside diameter of the cable also becomes easier, corner to
opposite corner of the polygon + the diameter of one circle.

of course, I could be wrong as my maths is very rusty!!!

Have fun.

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Gra### [at] themeliasfreeservecouk
"Life is like a box of chocalates... "
               ... the longer you hold on, the sticker it gets.

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