The Monosoupape is one of the simpler Rotaries of the Period . The exhaust port is directly open to the Air and ingests AIR immediately after exhausting to which an overly rich fuel-Air mix is added. There are many other brands around. Clerget, Siemens-Halske, Bentley. After WW1 the rotary concept was dropped. in favour of static/fixed. Motors. The rotaries used Windage to aid cooling which was inefficient. Nev