Marsboy's 2 stage rocket flying on an Estes D12 & E9 at the Dandenong Wetlands on May 23, 2009. The booster was quite tight into the base of the sustainer and didn't drop away immediately during staging. This caused a build-up of pressure and pushed the motor mount of the sustainer about 2 inches into the body of the rocket. The pressure also pushed off the nosecone. Quite a dramatic flight!