Around 1910 a rotary engine called "Rotaero" was manufactured by "Michigan Airship Co."

-It was of a different concept with respect to known other ones. It had a single body with one perfectly balanced cylinder.

-The different stages of admission, compression, combustion and exhaust occur at the same time but in opposite directions. It is based on the 2-stroke cycle.

-Another feature is that the ignition system is very simplified, unlike the rotaries with multiple cylinders since the spark occurs at the same time in the two cylinders.

"Silhouette of the Detroit Rotary Motor, Rotaero"

"Detroit Rotary Motor ad"