A glow plug is a thermal device used in methanol,nitromethane-powered internal combustion model engines. It provides the necessary heat for igniting the fuel/air mixture. Similar in execution to glow plugs used to help start some full-sized diesel engines, R/C glow plugs are first energized with the aid of an electric device called an ignitor which clips to the top of the glow plug. Most ignitors come with a factory-installed nickel cadmium sub-C-cell battery for power while some inexpensive ignitors utilize an ordinary C-cell alkaline battery. Regardless of the type used, the ignitor forces current through the glow plug's platinum-based heating element, causing it to glow yellow- to white-hot, hence the name. Once the engine is started and running properly on its own, the ignitor is remov