Patent ID: 7328870

Claim:
A propulsion system for an aircraft, comprising: four engines with pusher propellers, the engines being mounted in pairs on the wings of the aircraft and each having a specific direction of rotation, wherein: the respective direction of rotation of said four engines when viewing said engines from the rear of the aircraft is, from left to right: the clockwise direction; the counterclockwise direction; the clockwise direction; and the counterclockwise direction, the engines are mounted in a line along the wings from one side of the aircraft to the other, the two engines on the left side of the aircraft, viewed from the rear, are contra-rotating and air is concentrated between these two engines so as to guide the air flow in the direction of a tail fin of the aircraft, the two engines on the right side of the aircraft, viewed from the rear, are contra-rotating and air is concentrated between these two engines so as to guide the air flow in the direction of the tail fin of the aircraft, and the tail fin is exposed on both sides to a convergent air flow as a result of the pair of contra-rotating engines on each side of the aircraft.