How does aeroplanes fly? how its flying different from a helicopter?

Answer 1

The wings of an airplane generate the lift, a force pushing the aircraft up, necessary to lift the airplane. It requires a forward speed in order to work.

A helicopter simply uses a set of multiple "wings" that rotate. When the helicopter blades rotate, the blades move through the air which allows lift to be generated.

Most people INCORRECTLY believe lift is generated by Bernoulli's principle. Most of these explanations were probably taken from a high school physics text book. These are wrong and many of us aerospace engineers consider it a big problem.

Lift is generated by turning the airflow.

Please check my sources if you don't believe this. NASA has an explanation for those who were taught incorrectly in school.

People think that since the top of the wing surface is longer, the air particles have to travel faster to "meet up" with the ones below the wing, called the "equal transit theory". This is completely wrong. There is no reason why the air has to meet up with itself at the same time. As my aerodynamics professor once said "It's not like the air particles are quantum entangled".

In fact, if you look at wind tunnel tests, the flow does not behave like how people have been describing. It does not meet up with itself.

Basically, most wings have curved shapes which help create the pressure distribution that many people have stated. However, if you do the calculations on a real wing, it is much much much less than what is required to lift an aircraft.

In fact, most commercial aircraft such as Boeing's, Airbus's actually have a LONGER bottom surface to the wing! This is due to some complex aerodynamic issues that I won't discuss here.

Another piece of evidence: many aircraft have nearly symmetric wing cross sections! (many stunt aircraft) If they have such cross sections, how in the world do these fly?

The real reason for the shape of the wings is the fact that these shapes TURN the air downwards which generates a force. This is where Newton's 2nd law comes in. We are pushing the air downwards, thus we are creating a force pointing up.

Of course, in order to turn the air this way, there is a pressure distribution along the surface of the wing that helps "pull" the airflow down. This pressure distribution also helps out the lift a bit.

If you still don't believe me, here are some NASA articles on it:

The correct way lift is explained
http://www.grc.nasa.gov/WWW/K-12/airplane/right2.html

The wrong way lift is explained
http://www.grc.nasa.gov/WWW/K-12/airplane/wrong1.html
http://www.grc.nasa.gov/WWW/K-12/airplane/wrong2.html

Answer 2

Flying airplanes and helicopters are an same yet diverse. not tougher than one yet another in simple terms diverse. same rules of the line. same straightforward ideas of flight physics etc. diverse as interior the version between utilising a huge truck and using a motorbike. both would nicely be a project to fly in the start because you're studying something new, a useless ringer for even as first realized to force. in case your boy pal has a respectable instructor, which i'm positive he must have, he will come away with a sense for what it takes to how you could fly a helicopter after a one hour introductory flight. Then it will be as a lot as him to choose if flying helicopters is for him.

Answer 3

Helicopters and airplanes generate lift the same way. This is an over simplification, but in order to generate lift, the wing has to be moving through the air (Actually, air has to be moving around the wing). In a "fixed wing" aircraft, you move the wings through the air by moving the entire airplane forward (Which is why the airplane needs to keep moving, or else it will fall to the ground.). In a helicopter, the rotor blades are the "wing". Instead of moving the entire helicopter, the helicopter simply turns its "wings".

Answer 4

an airplane doesn't soar like a bird, it cuts between airstreams, so equal presure on top and equal pressure on bottom, means your "floting" and a rocket engine and your "flying"

Helipopters transfer centrifical motion - around and around becomes up or down...the second "rotor" on the back controls forward and backward - another "right angle" tansfer of motion

Answer 5

The pressure of air under it's wings causes it takes off.

Answer 6

Please proof read your questions.