Helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover and to fly forward and backward. These attributes allow helicopter to ve used in congested or isolated areas where planes or other aircrafts can not perform.
Helicopters were developed and built during the first half century of flight. FW61 is known as first practical and functional helicopter. It's first flight date is in 1936. Until 1942 some helicopters reached limited production but in 1942 Igor Skorsky designed a helicopter and reached full scale production with almost 130 aircraft built.
Most helicopters have a single main rotor. Helicopters which have twin main rotor are also use due to their greater payload capacity than a single main rotor design. The rotor system is the rotating part of the helicopter that generates to lift. There are three basic flight conditions for a helicopter. These are; hover, forward and transition between two. Today, helicopter uses include transportation of people and cargo, military uses, firefighting, search and rescue, construction, tourism, air ambulance and many other uses.