This 3d printed F- 35 is one of the best flying 3d printed planes I’ve ever seen or flown. Eflite ultrix 600 donor electronics are required but you’re welcome to try your own build with twin props or even a pusher design. If you buy one I will make a pusher prop adapter. The plane is 360 g all up weight. In all honesty, it flies better than the ULTRIX.