Hi Vincent, Let me tell you what I saw about this plane,,, #1, powered with a AMT pegasus. it rolled out straight, seemed to pick good speed to rotate, and as it rotated , it started to swing it´s wings
wildly at a high AOA ,( pretty much like the old f-100 sabre dance footage) . it flew at about 2 meter high 50 meters in this fashion until it hit the ground... # 2, AMT-180 powered: again rolled nicely, rotated, lifted off and again a single snap. don´t know what the pilot done but he saved it, and after winding up speed and trimming .
it flew nicely, until landing when it bounced badly,and tip stalled again.

I even not mentioned the smaller ducted fan models that had the same fate here.

Perhaps something to do with this is that Curitiba is over 3.000 feet above sea level, and planes here tend to have faster and less predictable stalls.