How does a plane takeoff and fly?

Answer 1

It’s easy to understand how a bird can fly—it’s lightweight and has wings. But how does a huge airplane get off the ground? The plane’s engine pushes the plane forward. As it moves, air flowing around the wings creates lift.

The lift increases as the plane gathers speed. The plane takes off once there’s enough lift to overtake gravity. When the plane’s in the air, thrust from the engines pushes the plane forward..

Answer 2

Bernoulli's principle assumes that the air above and below the wing must reach the back of the wing at the same time (the equal transit time assumption). This is not true.

Air that is going over the wing, clings to it (the Coanda Effect) and when it reaches the end, pushes downwards. Newtons third law says that for every action, there must be an equal, opposite reaction, pushing the wings up.

Answer 3

Bernoulli's principle. Basically, this Italian guy named Bernoulli proved that fluid that moves quickly has less pressure than fluid that moves slowly. Air, it should be noted, is a fluid.

An airplane's wing has a special design that cuts through the air - air that moves BELOW the wing passes a straight surface. But air that moves ABOVE the wing has to go around a curve to catch up with the other air. It has to move farther, and in order to keep up with the air around it, it has to move FASTER.

So, you have air moving quickly above the wing - this creates a space where pressure is lower than the pressure beneath the wing. This lower pressure pulls the airplane up towards the sky.

So there you go - once the plane reaches a fast enough speed, the pressure above the wing is low enough that it generates lift, and the airplane flies.

Answer 4

Sorry for that one guys. I know you love the Bernoulli principle answer but let me tell you this. There are ariplanes with symmetric airfoils! and fly. also planes can fly inverted. yes, like in the air shows.

With this two things in mind let me explain a bit, first, the bernoulli principle is truth, but the magnitude of this lift is very small compared to the magnitude of lift created by deflecting large amounts of air downwards with the wing.

Who has not played with his hand while traveling at highway speeds and experience lift over a surface of the hand? (this has nothing to do with Bernoulli)

for a much better explanation see:

http://www.av8n.com/how/htm/airfoils.html

Answer 5

when plane fly at that times its rotetor fan at top rotates at very high speed due to that it decreases the pressue at the top and plane fly.and when plane take off then it rotates at a slow speed due to that its pressure on top increases and it take off.