If you look on the SCARM toolbar you'll see a tape measure icon. Click the icon; place the cursor at one point; press and hold the left mouse button; and move the cursor to the end point, SCARM will draw and expanding circle and show the radius in the lower left corner of the window.
Using Carl's file, the distance is 49.43 inches. So you could try the following combinations:
- 10" + 30" + 9.43" or
- 30" + 19.43" or
- 10" + 10" + 29.43" or
- 10" + 39.43"
If the measurement is correct you could get within 0.03" of 0.07" of closure. Unfortunately, the MTH table is incomplete and does not include all the lengths and track combinations that one needs. For example, if you wanted to fill 20.25" gap it is not in the table and 10" + 10.25 is not possible. You need to do 9.75" + 10.5" to fill the gap. The table needs to be expanded to cover the longest straight section or 30".