A helicopter is an aircraft which is lifted and propelled by one or more horizontal rotor, each rotor consisting of two or more rotor blades. Helicopters are classified as rotorcraft or rotary-wing aircraft to distinguish them from fixed-wing aircraft because the helicopter derives its source of lift from the rotor blades rotating around a mast. The word 'helicopter' is adapted from the French hélicoptère, coined by Gustave de Ponton d'Amecourt in 1861. It is linked to the Greek words helix/helik- () = "spiral" or "turning" and pteron () = "wing".[LINK: http://www.etymonline.com/index.php?term=helicopter] "helicopter". Online Etymology Dictionary. Accessed 28 November 2007 (Cottez 1980, p.181) As an aircraft, the primary advantages of the helicopter are due to the rotor blades that revolve through the air, providing lift without requiring the aircraft to move forward the way

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # TAGS