Leonardo Do Vinci, the famous artist, drew his plans for a helicopter hundreds of years before man actually made it.
Today’s helicopters are lifted into the air by their rotating propellers. These work like narrow wings, generating lift as they spin rapidly through air. It climbs by increasing the angle of the rotor blades. It moves forward by increasing the angle of the blade moving back on every rotation, so that it pushes against the air.
Below Helicopter info from Wikipedia (Read More):-
A helicopter is an aircraft that is lifted and propelled by one or more horizontal rotors, 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 achieves lift with the rotor blades which rotate around a mast. The word 'helicopter' is adapted from the French hélicoptère, coined by Gustave de Ponton d'Amecourt in 1861, which originates from the Greek helix/helik- (ἕλικ-) = "spiral" or "turning" and pteron (πτερόν) = "wing".
The primary advantage of a helicopter is from the rotor which provides lift without the aircraft needing to move forward, allowing the helicopter to take off and land vertically without a runway. For this reason, helicopters are often used in congested or isolated areas where fixed-wing aircraft cannot take off or land. The lift from the rotor also allows the helicopter to hover in one area more efficiently than other forms of vertical takeoff and landing aircraft, allowing it to accomplish tasks that fixed-wing aircraft cannot perform.
http://en.wikipedia.org/wiki/Helicopter
