ROTATING BODY HAVING ROTOR BLADES

摘要

PURPOSE: A rotating body with rotors is provided to reduce rotating noise and vibration since a plurality of auxiliary rotors are extended between a plurality of main rotors to have relatively small sizes. CONSTITUTION: A rotating body(100) comprises a hub(110), a plurality of main rotors(120) and auxiliary rotors(130). The main rotors are extended from the hub. The auxiliary rotors are extended from the hub, have smaller sizes than those of the main rotors and rotate on the same rotating surfaces to the main rotors. The auxiliary rotors are arranged between the main rotors. The rotating body comprises the auxiliary rotors and the centroid of the auxiliary rotors is substantially the same to that of the hub.