My apologies if this has been answered before .
The Chanfa horizontal is a clone of the Yanmar horizontal hopper cooled diesel . What engine(s) did Yanmar copy or were inspired by?
http://gullis.org/baat/Baatsider/motor_historie.htm
Some history shows they built their own horizontal back in the 30's however there were german models very similar around that time, so maybe they were influenced.
Yanmar probably a copy of German Deutz MAH horizontal singles.
The Polish Andoria horizontal single looks strikingly like a Deutz MAH too.