Diesel Cycle - Applications - Other Internal Combustion Engines Without Spark Plugs

Other Internal Combustion Engines Without Spark Plugs

Many model airplanes use very simple "glow" and "Diesel" engines. Glow engines use glow plugs. "Diesel" model airplane engines have variable compression ratios. Both types depend on special fuels (easily obtainable in such limited quantities) for their ignition timing.

Some 19th-century or earlier experimental engines used external flames, exposed by valves, for ignition, but this becomes less attractive with increasing compression. (It was the research of Nicolas LĂ©onard Sadi Carnot that established the thermodynamic value of compression.) A historical implication of this is that the Diesel engine would eventually have been invented without the aid of electricity.
See the development of the hot bulb engine and indirect injection for historical significance.

Read more about this topic:  Diesel Cycle, Applications

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