Engine projects based on the Junkers Jumo engines from WWII. The Keros In engines are of the modular type, so that one cylinder with two opposed pistons is a unit that can be coupled with others, and so gradually increase in power.

“Several examples of the above mentioned engines”

From Appendix 9: From CAD design to realization as shown in the photo below of the Junkers Jumo type engine.

“The 6-double-cylinder model”

-The construction of these modular engines is a total machining from blocks of material. The quality of these works by Keros.in is surprising.

"Mechanization of the big engine block"

"Mechanized cylinders of magnificent appearance"