Helicopter

A helicopter is a type of rotorcraft whose lift and thrust are produced by one or more horizontally spinning rotors.

A helicopter is a type of rotorcraft whose lift and thrust are produced by one or more horizontally spinning rotors. This design allows vertical takeoff and landing, hovering, and flight in multiple directions without a runway. Helicopters are used in civilian, commercial, and military roles worldwide.

Design and flight principle

A helicopter uses one or more power-driven horizontal rotors to create lift and thrust. By changing rotor angle and pitch, the pilot can control ascent, descent, hovering, and direction of travel. Unlike fixed-wing aircraft, helicopters can take off and land vertically and hover in place. They can also fly in directions other than forward, including backward and sideways.

Operational advantages

Helicopters can operate without a runway, making them useful in confined, remote, or otherwise inaccessible locations. Their ability to hover also makes them suitable for tasks requiring precision or prolonged stationary flight. They are frequently used where runway access is limited or impossible, such as congested urban areas or isolated wilderness.

Uses

Helicopters are widely used for civilian transport, emergency medical services, law enforcement, construction, firefighting, tourism, and aerial observation. They are also used extensively by military forces for transport, attack, reconnaissance, and search and rescue.

History

Ideas for vertical flight appeared in early Chinese toys and Renaissance-era designs. Practical helicopter development advanced in the 20th century, with early manned flight achieved in 1907 and major operational development following in the 1930s.