I own a wide array of model engines. Typically those engines are either glow engines using nitro fuel, spark engines using gasoline or "diesel" engines using "kerosene". However I recently acquired a 6cc engine that runs using a glow plug (like a nitro engine), but it is fueled with gasoline.
I was curious, what are the mechanics that allow an engine to work on gasoline without a spark plug? Is it higher compression? Is it a special plug with a different catalyst that helps ignite the fuel/air mixture? Is it something completely different?