Heres a project that occupied my summer before freshman year, when I was fourteen. The Jet consists of a T3T4 turbocharger fitted with a combustor I'd fabricated from 5" exhaust tubing. I remember teaching myself to weld, cut, braze, and use a fire extinguisher... I've got bad speaking skills :P I substitute the word "oil" for "fuel" when I'm reading off the components. Fun project.