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WHAT ARE THE BASICS OF FLIGHT?

October 18, 2003 by Carl Chance

Although nothing is mind-boggling or mysterious about flying, there is much to learn — just as there is in learning to drive a car. As you learn to fly step by step, you’ll find your training enjoyable and challenging.

Although airplanes have been a part of our society for more than 85 years, most people have only a vague idea of the basic principles of flight. Flight may seem complicated, but in fact it’s based on some simple laws of nature.

lift

The principle of lift

When you examine a cross-section of an airplane’s wing, or airfoil, you’ll notice that the top part is curved and the bottom part is relatively flat. This special shape creates lift, which makes the airplane fly.

As the wing moves forward, the air flowing over the top travels faster than the air flowing beneath, resulting in a lower pressure area above the wing. The relative pressure differential provides the upward force called lift. Lift is basic to flying.

principles of lift

Lift and gravity

In order for an airplane to climb, lift must be greater than gravity, the force that holds objects on the earth.

For an airplane to maintain level flight at a particular altitude, lift and gravity must be the same, or in equilibrium. When gravity is greater than lift, the airplane will descend.

Thrust and drag

As an airplane moves forward, the wing produces lift. The force of forward movement is called thrust, and it’s created by the engine-driven propeller or a jet engine.

Like the wing, the propeller is also an airfoil. As it rotates, it creates “lift” in a forward direction that is called thrust. Thrust overcomes drag (resistance of an object toward movement).

When thrust is greater than drag, during takeoff, for instance, the airplane’s speed increases. When thrust and drag are equal, the airplane maintains the same speed. Whenever drag is greater than thrust, the plane slows down.

Lift, gravity, thrust, and drag are the four forces acting upon the airplane. You’ll learn to understand them thoroughly as you advance in your study of flight.

parts of an airplane

The parts of an airplane

An airplane, of course, is more than a wing, a propeller, and an engine.

The body of the airplane, which holds the pilot, passengers, and baggage, is called the fuselage.

The tail of the airplane is called the empennage, and it consists of the horizontal and vertical surfaces called stabilizers. They create the stability necessary to use the lift and thrust created by the wing and the engine-driven propeller.

Parts of the wing, horizontal stabilizer, and vertical stabilizer are moveable to provide the pilot with the means to control the airplane. These control surfaces are called ailerons on the wings, elevators on the horizontal stabilizer, and rudder on the vertical stabilizer.

You’ll become as familiar with the workings of these different parts as you are with the operation of a car.

Control

As the pilot, you control the airplane, and determine how it flies. The different movements of your controls will cause corresponding movements in the airplane. Here are some basic airplane movements.

Pulling the control wheel toward you raises the elevator, which in turn forces the tail down and the nose up. This serves to create more lift than gravity and the airplane will climb. To help produce the extra lift needed in the climb, you usually need additional power from the engine, which you achieve by using the throttle control. Pushing the control wheel away from you lowers the elevator, forcing the tail up and the nose down. This reduces the lift, and gravity makes you descend.

The rudder pedals control the movement of the plane from right to left in much the same way as the rudder of a boat. Pushing the right rudder pedal forces the nose of the airplane to the right, and the left rudder pedal produces the same movement to the left.

Turning the control wheel moves the ailerons in opposite directions, enabling you to raise or lower either the right or left wing which enables the airplane to turn faster than using rudder only.

To change the attitude of the airplane, its relationship to the horizon, you simply use the control surfaces and the power of the airplane. It’s an exercise in coordination, much like riding a bicycle. Your flight instructor will discuss with you how these simple movements can be combined to maneuver the airplane.

instruments

The basic flight instruments

Although the instrument panel of an airplane may confuse you at first, you’ll soon be familiar with the dials and switches and the valuable information they provide. The basic flight instruments are as follows:

Magnetic compass — Like the compass you have seen in a car or boat, it tells you the airplane’s heading — the direction it’s flying. It requires no power source.

Airspeed indicator — It shows the speed of the airplane through the air.

Attitude indicator — This instrument is like the horizon you see looking out from the pilot’s seat. It tells you whether the nose of the airplane is pointed above or below the horizon and whether the airplane is turning (banking) to the left or right (left wing down or right wing down).

Altimeter — This instrument shows the airplane’s altitude in feet above sea level.

Vertical speed indicator — This instrument tells you how quickly you’re climbing or descending in feet per minute. When you’re in level flight, it reads “0″.

Heading indicator (directional gyro) — This instrument is another compass. It shows the direction that the airplane is flying. It’s usually bigger and easier to read than the magnetic compass, but requires some source of power to work.

cockpit

Turn coordinator — When you’re turning the airplane, this instrument shows the rate and the direction of the turn. In this way you can adjust to a slower or faster rate of turn.

After your first few flights, you’ll be thoroughly familiar with these instruments and how they work together with the airplane’s control surfaces.


Copyright 1996 General Aviation Manufacturers Association
General Aviation Manufacturers Association

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