The Coleopter is a vertical takeoff and landing aircraft concept, based on the studies of circular wings by the Heinkel brothers, who proposed this type of wing in their World War II Wespe and Lerche designs.
In this concept, I introduced a rotary wing, to make it possible to take off and land horizontally and not vertically.
The Coleopter would be powered by two turboshafts: a main one that would feed the counter-rotating blades of the circular wing, and a second smaller turboshaft, located at the rear. This turboshaft would be in charge of driving the rotation mechanism of the circular wing, and in turn, would provide additional thrust to the rear blades.
The concept of two tandem pusher propellers can be seen on the Dornier Do335.