My classic '72 EnerJet AeroDart launched w/ a 72-era EnerJet F52 motor. Begad! T' epoxy bond on foward cap let go, and t' rocket shredded. Arrr! T' motor blew out t' bottom o' t' rocket and instantly stopped burning--it was nearly full o' unburnt propellant. Ahoy! I was able t' recover enough parts o' t' payload section t' rebuild.