(Sometimes Salbi).

From Appendix 6: It is a small-size engine, but intended for greater powers than those granted to its weight. The first projected engine was one of 24 cylinders arranged around the drive shaft, driving it with bevel gears. There were six groups of four cylinders in this position.

-It had two propeller outputs, for pull or push. Or both.

“First design”

-The engine that was built, was very aerodynamic as we can see in the picture below.

"Appearance of Guido's engine"