Original poster: "Peter Lawrence by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Peter.Lawrence-at-Sun-dot-com>
Godfrey,
all of my toroids are approximately 4:1 ratio of thickness to outside
diameter (eg 1.5x6, 2x8, 3x12). If you came up with a formula that was
highly accurate in the 3:1 to 6:1 range I think that would be fine.
Pete Lawrence.