One of many, many test flights of my team's 2009 TARC design. Powered by (2) Estes E9's and (2) C6's, the objective was to reach as close to 750 feet as possible, with a total flight time of 45 seconds, while safely carrying a single hen's egg. The idea behind the clustered motor setup was to help reduce the effect of any single motor being slightly off of rated performance (due to manufacturing tolerances, batch variations, etc.). The rapid spinning is by design: fine altitude adjustments were performed using adjustable spin tabs to add or reduce drag. An added benefit of the spinning was its contribution to overall stability, and provided some resistance to weathercocking (tendency of the rocket to arc into the wind).