Cardboard airplanes

50+ years ago, we flew U/C in my cousin's front yard. We were limited to 8' lines but it was convenient as we didn't have to trek off to a field somewhere. After flying the usual balsa profiles, we tried something different. (Sadly nobody thought to take any pictures back then). We started with a 1/2" square balsa stick for the fuselage, and made a wing from corrugated cardboard. No need to bother painting it as a replacement was only a box away. To mount the engine (0.049 Tornado, OK Cub or Babe Bee) we used a perforated strip of green steel Mechano girder bolted to the balsa stick. I'm guessing that the tail was balsa but honestly can't remember.
These crude planes actually flew and by bending the engine mount upwards and outwards about 30 degrees, the plane would "sabre dance" if you held up elevator; actually hover at the end of the lines. (We had read that Jim Walker would do this but guess now that he used some sort of throttle; we didn't.) By pushing down elevator, the plane would then resume flying. Sort of crude "3D" 50 years ago.
Certainly a LOT has happened since those early days of my flying career, but I thought the concept might be of interest to some of the members of this group.