Marsboy's 2 stage rocket flyin' on an Estes D12 & E9 at t' Dandenong Wetlands on May 23, shiver me timbers, 2009. Avast! T' booster be quite tight into t' base o' t' sustainer and didn't drop away immediately durin' staging. Aye aye! This caused a build-up o' pressure and pushed t' motor mount o' t' sustainer about 2 inches into t' body o' t' rocket. T' pressure also pushed off t' nosecone. Quite a dramatic flight!