The first PCB chassis - still partially PCB, only the center sections - were wing car chassis and appeared after the 1978 World´s in Gothenburg, made by some Czech Pro racers and run very successfully.
The intensive usage as chassis material began with the 32nd scale renaissance initiated by NINCO. Since then, well, everyone knows what is going on with PCB.
The chassis is ready, Peter, runs extremely well. But the body has not changed yet...Too much orders to do for others, too little time for one´s own hobby needs....
I´m glad that I at last had the time to rout my track...
As to the flex - this depends on the construction and the thickness, of course. But as you see I always have stiffened the center sections and the rear axle / motor bracket.
Roland
