A diesel engine is a compression ignition engine with direct, timed fuel injection. Other compression engines are not diesels, including Lister Cycle engines that use kerosene or diesel with the fuel added to the air stream in a carburetor or which have untimed injection into the cylinder or intake.

Why wouldn't you fly on a diesel powered plane? Diesels are high on torque and often have optimal power output at typical aircraft engine speeds (1200 or 2400 rpm are typical). Remember, nearly all modern aircraft piston engines use constant speed propellors and run at fixed rpm except when idling.

The Germans used many of them during WWII, although they were somewhat underpowered due to lack of turbocharging, I think.

Peter

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