In April 1936, the Rouffaer Aircraft Corporation presented its model 6 airplane, which had not been completed, but it had installed a prototype engine of the same Rouffaer brand.

“The model 6 in its construction phase”

-The engine gave 80 HP and its main characteristic, as we can see, is the completely circular crankcase.

“The Rouffaer with horizontal cylinders”

-We can see the four vertical exhausts directly downwards. The carburetors were at the rear of the engine.