A helicopter is an aircraft whose lift and propulsion are provided by a rotary wing, commonly called rotors, and driven by one or more engines. The majority of helicopters use a single lift rotor and an anti-torque rotor, the other solutions are counter-rotating bi-rotors placed on the same axis, on two convergent axes, in tandem or on the sides. The history of the helicopter begins in the early twentieth century but progress is much slower than that of the aircraft. The intensive use of helicopters in Algeria and Vietnam and the development of turbomachines mark a major turning point in providing proof of its civilian or military operational capabilities.
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