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Rotary Wing Helicopter Research Paper

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Introduction
Helicopters are also known as rotary wing aircraft. Their rotating wing is known as the main rotor. It is a type of rotorcraft. In this thrust and lift are supplied by rotors. The helicopter is capable of direct vertical take-off and landing and it can also hover in a fixed position. These features allow it to be used in small & precise locations. Helicopter word is adopted from French word helicoptere. Other names used for helicopters are "chopper", "copter", "helo", "heli", and "whirlybird".
Helicopters come in various sizes & shapes but most of them have common components. These are cabin, airframe, engine, transmission, anti torque system, landing gear. Helicopters mainly have two rotors one main and the other in tail …show more content…

It all started with bamboo toys of Chinese children which transformed into a mechanical design. These toys were the first to be observed for vertical take flight. It was during the 15th century the Italian painter Leonardo da Vinci sketched the flying machine which was based on whirling. The next important sketch in history was of twin-rotor aircraft drawn by british scientist sir George cayley. In the early 18th Frenchman Paul Cornu managed to lift himself off the ground for a few seconds in an early helicopter. However he was not successful in his development. All engineers faced the same problem of not having device that could generate enough vertical thrust to lift both the helicopter and any significant load (including passengers) off the …show more content…

These systems have 3-4 blades. The horizontal is responsible for the up and down movement of blade. The name of this movement is flapping and is designed to compensate for dissymmetry of lift. The flapping hinge can be located at varying distance from the rotor hub and there may be more then on hinge. There is one vertical hinge also known as lead-lag or drag hinge which allows the blade to move back and forth. This movement is called as lead-lag, dragging or hunting. Each blade can also be feathered which means they can be rotated around its spin-wise axis. Feathering means changing the pitch angle of blade by this you control the thrust and direction of main rotor

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