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