Helicopter dwg
A helicopter is a heavier-than-air aircraft that is supported and propelled by one or more horizontal rotors; each one made up of two or more blades. helicopters are classified as rotary-wing aircraft to distinguish them from fixed-wing aircraft because helicopters create lift with blades that rotate about a vertical axis. the word "helicopter" derives from the french term hélicoptère; coined by aviation pioneer gustave ponton d'amécourt in 1863 from the greek words helix/helik - (propeller) and pteron (wing).