Fuels for RC Aircraft

Naturally, batteries are used to propel electric models . The chainsaw type engines run on petrol and diesel motors run on ether - based fuel. So, the remaining glow plug (a small type of spark plug) 2 and 4 stroke engines run on a methanol- based fuel. The lubricant is either castor oil, synthetic oil or a mixture of both. Some flyers still like the insurance of having some castor present e.g. (3-5 % or whatever). Then to give a better idle a chemical called nitromethane can be added. Personally I only use it for small engines .049 cu in etc and four strokes. The manufacturer specifies the proportions for proper performance.
e .g. 80% Methanol/20 % castor. An afterun oil is usually squirted into the engine at the end of flying as corrosion can get to the metal parts - especially if using nitromethane. There can be big savings to be had by mixing up one's own fuel.