The recent announcement of the Minerva Peckett E type tank engine, and my ownership of little blue Fowler and, most likely, impending purchase and building of another small tank loco, gives cause for me to re-open the can of worms of S7 and safe working radius. A picture in the announcement thread on 'the other place' (link
http://www.rmweb.co.uk/community/in...ched-and-announces-peckett-e-class/?p=1811088) whet my appetite something fierce. Double check-rails, incredibly tight curvature.... So I dug out some twice-previously-used copperclad sleepers and some ex-Hornby-Setrack flat-bottom code 100 rail, marked out a
3 foot radius curve and set my soldering iron and S7 roller jigs to work.
There was some tweaking of the check-rails required - initially I had the two bases of the FB rail touching - on the flat, it's perfect (even with the Slaters F7 wagon wheels I have - regauged back-to-back for S7) but more breathing room is required around the curve. It's not perfectly curved... but then, I've no doubt the real thing wasn't either! It's only about a foot of track, but after a little nudging of the check rails, my Fowler (the top isn't screwed on yet!) ran very smoothly around it, as did pushing a wagon around by hand. Not a high-speed-running situation, nor the sharpness of curve I would want to put any kind of reverse-curve transition onto without a foot of straight in the middle to settle, but in my books -
it works. This opens up a myriad of options for designs of small layouts for me... interesting times await!