I had a simjet that would do this very same thing,not on a flame out but on a failed start ,the fuel pump would keep pumping raw fuel straight in until it was running out the front cover. Lucky it was on a kangaroo where we could see it. Would catch fire and burn out the exhaust sometimes, i guess from the propane fire. What caught yours on fire escapes me " turbine newby" If the plane acutally flamed out there would be no ignition source right?? Sad day though i know, alot of money and time , sounds like you were doing well with it too. Russ