It’s an Open Source Two-Stroke Diesel Engine that’s easy for anyone ... a highly successful aircraft engine first produced in the early 1930s and continued production through World War II.

Although they still exist, 2-stroke diesel engines aren't all that common, and 4-stroke engines are what you'll commonly see ...

We’re introduced to the traditional two-stroke diesel engine as thermally efficient but not smooth-running, and then the gas turbine as smooth but much more inefficient. The free piston engine ...