Cyclocopter - original vertical take-off aircraft

It turns out that not only the rotor rotating in the horizontal plane is able to lift the aircraft into the air. The cyclocopter rotors, similar to the paddles of an old steamboat, look very unusual, but nonetheless they work. Until now, all attempts to create such an aircraft ended in failure, and only recently the first flying models of cyclocopters appeared. The video shows a cyclocopter developed at the University of Maryland.