Unmanned aircraft and operation method for the same

An unmanned aircraft, comprising:

• a propulsion system that comprises a diesel or kerosene internal combustion engine, wherein the propulsion system is a hybrid propulsion system which, in addition to the internal combustion engine, comprises an electric motor and an energy storage device configured to store electric energy for driving the electric motor;
• a charging device configured to charge the internal combustion engine of the unmanned aircraft;
• and
• a controller configured to control the charging device or the hybrid propulsion in accordance with flight operation parameters,
• wherein the charging device is designed for multi-stage charging,
• wherein the charging device comprises multiple exhaust gas turbines that are connected in series,
• wherein the charging device additionally comprises at least one mechanical charger configured to be driveable by the electric motor of the hybrid propulsion, and
• wherein the controller is configured to control charging of the charging device with or without the use of exhaust gas energy and by the use of mechanical energy from the internal combustion engine or from the electric motor.