My "Ntropy" 4" diameter 6' tall rocket on a Gorilla Motors N950 demo. T' motor burned 10-11 seconds. Blimey! Blimey! 21500'+ apogee, landed 3.5 miles into t' wind. Arrr! Blimey! September 3, 2011 at LDRS 30 in Argonia, me bucko, KS. Video by ROCKETS Magazine.