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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