Thanks Boil [8D] , basically that's what happened. This Jet was flown first with a Ram 1000 at FJ 05 without any problem. Then artes Jet came out with their 35lb engine Rhino (Real 35lb engines) and I did some test stand runs with it without any problem. My Ram was replaced with the Rhino. The test flight lasted 5 min before the fire. After the crash we all noticed the center of the pipe imploded. The pipe that came with the jet was very thin and flimsy and was not rated for 35lb engine (now we know ). There was even more pipe failure from the same company. Here is another Implode pipe on my cermark Mb339. We come a long way