In the Build a Bimp Simulation groups are given building and flight assignments for the construction of actual working Blimps. They consist of helium balloons, balsa wood, building materials, and many other 'things' to construct the gondola and balloon supports. The blimps can complete an intriguing course of flight or be raced with other blimps. Lots of strategizing and team fun. Build A Blimp can accommodate groups of up to about 200 people.