Coaxial-rotor aircraft: Difference between revisions

 

== Design considerations ==

 

Having two coaxial sets of rotors provides symmetry of forces around the central axis for lifting the vehicle and laterally when flying in any direction. Because of the mechanical complexity, many helicopter designs use alternate configurations to avoid problems that arise when only one main rotor is used. Common alternatives are single-rotor helicopters or [[Tandem rotors|tandem rotor]] arrangements.