Custom built 12' x 5.5" high power rocket for Tripoli Level 3 certification. Rattworks M900 hybrid rocket motor with a peak thrust of 437 pounds and an average thrust of 140 pounds for 12 seconds. Max speed .63 Mach, altitude 8100'. Fire In The Sky, Mansfield WA, 5/23/2009 Details: http://www.macmillen.com/rocketry/l3/