SNIP...
Will use largest curves am able (being a real man) but nice to know the safety margin, target is better than 11". Have put down single full board, flat loop with couple of points using flexitrack for nearly all of it. loco and 5 wagons runs round with no derailment or wobble, only one join thats got a largish gap but havent tried to reduce it yet. Am remembering techniques used a few years ago when learnt every daft mistake :-)
Cheers, Simon