17) Single seater helicopter

SINGLE SEATER HELICOPTER

A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL (vertical takeoff and landing) aircraft cannot perform.

The English word helicopter is adapted from the French word hélicoptère, coined by Gustave Ponton d'Amécourt in 1861, which originates from the Greek helix (ἕλιξ) "helix, spiral, whirl, convolution" and pteron (πτερόν) "wing". English language nicknames for helicopter include "chopper", "copter", "helo", "heli", and "whirlybird".

How Does A Helicopter Work?

In order to fly, an object must have "lift." Lift is what pushes something up. Lift is made by wings. Wings have a curved shape on top and are flatter on the bottom. That shape makes air flow over the top faster than under the bottom. The faster air on top of the wing makes suction on the top of the wing and the wing moves up. Airplanes get lift from their wings. A helicopter's rotor blades are spinning wings. A helicopter moves air over its rotor by spinning the blades. The rotor makes the lift that carries the helicopter up.

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Helicopters can be used for many things. They can be used as flying ambulances to carry patients. They can be loaded with water to fight large fires. Military forces use helicopters to move troops and get supplies to ships. Helicopters can move large objects from place to place. Helicopters can rescue people in hard-to-reach places like mountains or in oceans. Television and radio stations use helicopters to fly over cities and report on traffic. Helicopters are used by police and by people on vacation. These uses are just some of the many things that can be done with helicopters.

Sikorsky, a Russian engineer, built his first helicopter in 1909. When neither this prototype nor its 1910 successor succeeded, Sikorsky decided that he could not build a helicopter without more sophisticated materials and money, so he transferred his attention to aircraft. During World War I, Hungarian engineer Theodore von Karman constructed a helicopter that, when tethered, was able to hover for extended periods. Several years later, Spaniard Juan de la Cierva developed a machine he called an autogiro in response to the tendency of conventional airplanes to lose engine power and crash while landing.

HELICOPTER FACTS :

In 1861 a machine was called a helicopter, but it could not lift off the ground. If the helicopter's engine stops, the rotor will often allow the helicopter to land safely because it continues to spin. There is a nut holding the main rotor to the shaft of the helicopter, called the 'Jesus nut'. This nut was named as such when a pilot said, "Oh Jesus, if that nut comes off..." Helicopters can be used to lift heavy items into place. The Russian helicopter MIL Mi-12 Homer could lift 40,204kg to a height of 2255 meters. Footnotes : Sources :Wiki and Helicopter facts