This is a cardstock rocket my mid-school elective class built. We launched it on a D12-5 with great success. It used a 12 inch parachute for recovery. The main tube was built using 17 inch cardstock double wrapped around pvc pipe, coupling two sections together. Their next project(s) is the making of a micromaxx, a 13 mm rocket, an 18 mm rocket, and a 24 mm rocket.