Environmental issues This invention relate to a cleaning drone based on a multi-copter flying platform comprising a plurality of sustentation rotors, a cleaning device protruding from the main body of the drone and a plurality of pusher propellers protruding from the main body of the done in a position being opposite to the protruding cleaning device, these pusher propellers being aligned at a substantially orthogonal angle in respect to the sustentation rotors in order to provide a pushing force for the cleaning device to act upon the surface to be cleaned, the cleaning drone further comprising a communications system, allowing it to receive commands and to send back responses to a remote controller, a geographical positioning system, allowing it to execute translation operations based on a known position, and a visual recognition system, allowing it to recognize visual features on the surface to be cleaned or on its immediate surroundings, wherein the sustentation rotors and pusher propellers are driven by electric motors which are fed by at least one power source selected from the group consisting of electric batteries, a fuel cell, a generator driven by a small piston engine, a thermo-photovoltaic fuel based generator, or any other electric energy storage or conversion mean. In a preferred aspect, the cleaning device is protruding from the front side of the drone's main body and comprises at least two straight flexible blades being hold in place by an enclosure defining a cavity which progressively.
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