A major problem with trying to determine original Flyer radius from track is the lack of consistency with the curve track. The metal is ‘springy and no two pieces are exactly alike. If you want to use your method, try making a circle from Flyer switches. The thinking is the plastic should be reasonably stable, at least as far as holding the metal rail.
I’ve attached some old drawings I did some time ago. The stated radius of the SHS S-Trax came from a post by Don Thompson, however I don’t think the info was correct even though it is documented. Maybe he was thinking the inside edge of the roadbed?
5” centers for Flyer track also yields a radius which is too small. If you measure the parallel track from a cross-over made from two Flyer switches you get 5 1/8” centers and that results in a roughly 19 1/8” radius. I believe somewhere Gilbert said the radius is 19”.
Let me know what you think…
Tom Stoltz
in Maine
