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How Do Airplanes Fly?

How do airplanes fly?

Rather than asking students who invented the airplane, it is important that Filipino educators begin explaining to their students what makes an airplane fly? We all know that Orville and Wilbur Wright developed a flying machine that first lifted from the grounds of Kitty Hawk, North Carolina and stayed on the air for 12 seconds on December 17, 1903. But it is time for both teachers and students to know how and why that machine flew in the first place.

Instead of using aerodynamics terms to explain the theory of flight, it will be useful to explain it in the simplest way possible. An airplane is able to fly because it applies a force created by a propeller, which is strong enough to make it move forward and uses wings or airfoil to deflect air pressures in such a way that the wind pushes back from underneath the wings to lift the whole airplane.

The propeller creates an aerodynamic force called thrust, which pulls the air past the blades. The movement of the wind around the wing creates a movement called "lift". The plane can fly higher or lower and faster or slower by adjusting the position of the wing to direct air pressures.

The angle of the wing determines how much air pressure it can get from underneath, and how high the airplane can fly. The greater the pressure under the wing, the greater the lift.

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How does the telephone work?
Alexander Graham Bell was credited for having invented the telephone on March 10, 1876. It was a magnificent invention, that helped us in so many ways. It is only proper that we give proper recognition to this device by trying to understand how it functions. But we would not go to the extent of explaining acoustics or the science of sound to make our point.

First let us define telephone as a device capable of replicating voice and transmitting it from one point to another in the fastest means possible. Imagine, we can now hear the replicated voice of our relatives on the other side of the planet in a matter of seconds through telephone wires. Yes, the voice we hear on the phone is a product of replication by devices.

Let us try to define some terms in simple language. Human voice is a sound, which is produced by the movement or vibration of our lips, tounge and mouth. Sound wave travels through the air, water or solid objects. It is important to realize that sound can be converted into electrical energy, which we will elaborate later. Telephone is a device that can transform sound into electrical energy and transmit it through copper wires to another point.

Remember that as grade school children, we had for a school project a basic telephone, composed of two cans connected by a string. When we pull the string to form a straight line and make it tight, we can actually communicate through the cans. This is possible because when one student talks into the can, the bottom of the can vibrates back and forth with sound waves that travel through the straight line of string, which the other student who puts his ear near the can hears. The telephone uses the same principle, but instead of string, it uses wire.