Here is Team Safarik's Creation, the Caelus Bipe. My dad Pavel designed and built them. Construction is a mix of balsa/foam for the wings, stab, and parts of the fuselage, and molded fiberglass parts for the cockpit, canopy and bottom tail. The Prototype is the red and orange one, which started life at 5.5kg but got down to 4940g with a hacker c50 xl11 and 9s 25-50c 5000mah batteries. the white/blue/orange model was much lighter, coming in at 4800g with a helical neu motor and the same 9s batteries. I got to fly the prototype at the Nats as my reciever battery failed mid-flight in the blue/orange incarnation. The airplane flies beautifully, with just a touch too much fuselage side area. The Plan for this winter is a composite fuse, and foam/built-up/composite wings depending on time.