The Aerocopter Sarus is a mono-tilt-rotor rotary-ring VTOL aircraft currently under development by Aerocopter Inc. It differs from previous tiltrotors in that instead of each rotor consisting of long blades attached to a central rotary ring it has a single rotary ring which has a diameter equal to the entire wingspan of the aircraft with the ring being attached to the tips of the wings. Small blades are attached to the outside of the ring.
Made by AeroCopter Inc..