The last couple of years development in aircraft engines was more or less focussing on diesel engines. We have seen one off installations to fully developed engine production lines. A number of companies are active on this market primarily due to major concern of long term availability and the relative high price of AVgas (Europe). JET fuel (avtur) is available worldwide and can also be used in diesel engines. This fuel can also be made of renewable sources (biomass) which contribute to a cleaner environment.
Last but not least: diesel engines have an excellent specific fuel consumption compared to their AVgas cousins and as fuel is denser too, range of an aircraft is improved.
In this text we spend some time with these engines as they are getting more and more common on the flight line and are accessible to aircraft builders too.
Below a bit of history on the famous JUMO 205 aero diesel.
Excerpt from the document:
Junkers Jumo Diesel aircraft engines are the only large engines functioning on the two-cycle principle which are used in modern aviation. They are built in Germany and are used extensively in both civil and military airplanes in that country. The best known model is the Jumo 205 which has been built by the thousands in a specially equipped factory. See Jumo 205D image here (large!).
This engine is not supercharged although it is equipped with a centrifugal-type blower. Like other Jumo Diesels it is water-cooled and has a low frontal area.
To continue reading see the pdf below: