Can there be more than one pair of Rotor blades in a Helicopter?.
If yes, What are the advantages or disadvantages?.
Answer Do you mean a rotor with a pair of blades or a helicopter with a pair of rotors? Many helicopters have more than two blades and a number of dual rotor helicopters have been developed over the years such as the Chinook, which has tandem rotors. The advantage of dual rotors is the high lift capability. They are typically designed to carry large cargoes or troop numbers. Because the rotors rotate in opposite directions, the induced moments are cancelled and no tail rotor is needed. The disadvantages include low forward speed compared to attack helicopters, for example, and vibration induced by overlapping rotors.
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Prashant S Akerkar
Aeronautics, Aerodynamics, Fluid Mechanics, Aeroacoustics, Noise Control, Muffler Design, Wind Tunnel Research.... I know nothing about India - do not ask about schools, jobs, application requirements, career choices, etc. for India. Please, no text message verbiage; I prefer full words in full sentences. Thanks.
38 years as research engineer at NASA
Publications AIAA, NASA
Education/Credentials B.S. and M.S. Aeronautical Engineering - U. of Washington,
Graduate work Standford U.
Awards and Honors AIAA Associate Fellow (American Institute of Aeronautics and Astronautics)