Helicopter Vertical take-off


Helicopter Vertical Take-off 

At the heart of a helicopter’s ability to soar into the sky lies its rotor system. Unlike airplanes, which rely on forward motion to generate lift across their wings, helicopters create lift directly through the rotation of their blades.

The Physics of Vertical Lift

Bernoulli's principle

-Explains how the faster air above a rotor blade creates lower pressure than the slower air below it.

Newton's third law of motion 

-States that for every action, there is an equal and opposite reaction

-Explains how the downward thrust of air by a rotor blade creates an upward lift

Four forces at work (Lift, weight, Thrust and drag).https://youtu.be/3gQ9AfgkaGM

Explanation 

The shape of the rotor blade and the angle of attack cause air to move faster over the top of the blade

The faster air above the blade creates lower pressure than the slower air below it

The rotor blade pushes air downward, which creates an upward reaction force (lift)


Challenges of Vertical Take-off

Vertical take-off is not without its challenges. 

One of the primary concerns is the phenomenon known as “vortex ring state” or “settling with power,” which can occur when a helicopter descends into its downwash, reducing the effectiveness of the rotor system and making it difficult to maintain lift. Pilots must be skilled in recognizing and avoiding this condition, especially during vertical take-offs and landings in confined areas.

Another challenge is the need for significant power to achieve vertical take-off. The amount of energy required to lift a helicopter vertically off the ground is substantial, and managing this power efficiently while maintaining control and stability requires both advanced technology and pilot expertise.


Compiled by

Ms Naresh kuwar 




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