The A1-C project was started in the last century. In the beginning I designed the airframe with my father for a small class .25 glow engine. Little we knew about aeronautical structure design, or even just model design. That’s why for the first prototype we took inspiration  from the early 3D Fun Flyers, which started to appear on the market in the late nineties. While not so bad in the general design, it was way