Helicopter

 The helicopter is a type of rotary-wing aircraft that is what distinguishes it from the plane, which has fixed-wing (conventional ). These wings allow it to take off and land vertically andlaterally. It was created in 1942 by Igor Sikorsky and has military and civilian uses, such as troop transport, casualty rescue , transport entrepreneurs, among other purposes. Thehelicopter is much more complex than the plane, more expensive to buy and maintain andspeed is slower , with little capacity. It is an advantage in maneuverability, can stop,reverse the trajectory and flight to take off and land vertically. There are four types ofhelicopter: Tandem, Rotor Coaxial, Notar and Fenestron. The Tandem has two motors ( front and rear) that rotate in the opposite direction from each other. In addition toachieving high speed, carry a greater amount of weight. The Rotor Coaxial has two engineson the same shaft and was manufactured by Kamov. The Notice has no tail rotor, is a small helicopter and is safer landing. The Fenestron have the tail rotor protected by a conductand and it is used by the U.S. Coast Guard.
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