The craft has two three-bladed helicopter-type counter-rotating rotors in a circular casing formed from bearing beams (5) and side cladding (8), with air intake guide and control strips (6,7). The rotors fill the entire internal diameter of the craft. The two rigid rotor blade hubs (9) are of a diameter twice as long as the blades (10). They are rigidly flanged so that the craft can remain stable for all flight maneuvers due to the gyroscopic effect created by the rotors. A gear wheel (9e) driven by a sprocket (2c) is inside the hubs.
