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