RE: Kangke F3D info needed.
I built an LR1 with an electric power system. The airframe is really draggy even with 1600 watts it barely went 130mph level. The wing was molded but it was an incredibly weak layup. I mean REALLY weak. One hard landing and the entire leading edge of the wing delaminated and split like a wish bone all the way down the wing. The rest of the plane was okay just the wing sucked really bad. Perhaps if you reglass and repaint the wing it would be okay. I did fly it at an incredibly heavy weight so I'm sure that made things worse as it would come in insanely hot however the way the wing would just come apart on inspection it was clear they were very light on the cloth and resin.