Here is another rocket I made using styrofoam balls. From the top, a 2", 4" 6", 8" 10" and 12". The 8, 10 and 12 were hollow. The others were solid. It has a 3" body tube core. A 29mm x 12" motor mount. It weighs 46 ounces. I probably should have made the fins bigger. When I drew it up they looked big enough. Only time will tell. Hasn't flown yet. I'm counting a lot on drag to help stabilize it. Thrust curve predicts 500 feet on a H135. Anyone else using styrofoam to build rockets?