SR-71 Blackbird with Kelly Johnson You will never need to refuel in the air again with a fuel cell hydrogen or methane fuel management system and generator with a wire running from the fuel cell to each engine. Any non liquid gas would do. You could use the same propane from a taxi and make any adjustments if any. bumboclot! He reach. Me estudas con Nasa por bueno space ships. IL n'est pas difficile avec petite etudier! Je suis culte le un Dieu dans Ecclesias ou Dans Eglise. Quelle et ton intention? These jet engines are like Vacuum engines. They are not internal combustion engines. If you wanted to put a propane tank on an old spitfire or bi plane, you would have to put the propeller on an electric engine. Wire the electric engine to a fuel cell generator that is powered by the propane. If you want to power a combustion engine with the propane, then do it. Most taxis fueled by propane have internal combustion engines like most propeller air planes.