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Aye, Capt'n Bob, a Number 6 switch definitely can't directly replace a piece of sectional track, but if you want to complete a 90 degree curve with sectional track, it is quite useful to know how much to cut off a section so that things come out right.  Now if the sectional track being used was the type where 20 made a circle, each section would be 18 degrees long and a half section would 'stretch out' the Number 6 to make 18 degrees. And if the sections were 15 degrees long, then a third of a section would work nicely.  Of course straight sections or whatever would have to be added to make a loop but that's a nit in the great outsideE.R., thanks for the update.  I figured it was a cut and dry mathematical exercise. Using 45mm for the gauge and 622.5mm for the outside radius, I come up with the same figure.  But empirical data is useful; I did make a mistake in using 45mm for the gauge, though; my mike shows the switch I measured to have a gauge of 45.2mm.  That makes the outside radius 622.6mm, mathematically yielding an angle of 21.97 degrees with the frog to be located at 233mm from the start of the switch.  Since the measured distance was greater, 239mm, the angle also has to be greater.  I thought I was giving LGB the benefit of the doubt because of the points being placed behind the start of the switch but I doubt that that would affect things very much.I had a math instructor once that insisted the number of significant digits in an answer could be no greater than the smallest number of significant digits in any factor involved in the final answer.  So, I'll happily settle for an R1 switch having a frog angle of 22 degrees.Art
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