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Disadvantages Of A Helicopter

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A helicopter is an rotorcraft that is lifted and propelled by one or more horizontal rotors, each rotor consisting of two or more rotor blades. The word “helicopter” is adapted from the French hélicoptère, coined by Gustave de Ponton d’Amécourt in 1861. It is linked to the Greek words helix meaning spiral and pteron meaning wing.
As an aircraft, the primary advantages of the helicopter are due to the rotor blades that revolve through the air, providing lift without requiring the aircraft to move forward. This creates the ability of the helicopter to take off and land vertically without the need for runways. For this reason, helicopters are often used in congested or isolated areas where fixed-wing aircraft are not able to take off or land. The lift from the rotor also allows the helicopter to hover in one area and to do so more efficiently than other forms of vertical takeoff and landing aircraft, allowing it to accomplish tasks that fixed wing aircraft are unable to perform. Hence, …show more content…

These situations are termed as the helicopter hazards.

Retreating Blade Stall :
The forward speed of the helicopter leads to a higher relative airflow over the advancing side as compared to the retreating side causing a hazardous situation termed as the retreating blade stall. As a result a dissymmetry of lift is observed.
It is immensely important to have a same amount of lift across the rotor disk. To serve this purpose the advancing blade flaps up and the retreating blade flaps down.
This causes the angle of attack to decrease on the advancing blade, which reduces lift, and increase on the retreating blade, which increases lift. At some point as the forward speed increases, the low blade speed on the retreating blade, and its high angle of attack cause a stall and loss of lift. Retreating blade stall limits the helicopter 's

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