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# How does an object heavier than air fly?

flight
by

## felix browning

on 31 March 2011

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#### Transcript of How does an object heavier than air fly?

How does an object heavier than air fly? The forces of flight The four main forces of flight are Lift, Thrust, Drag and Gravity . Thrust is the force moving an aircraft forward. It comes frome a source of power, like a propeller, a rocket engine, a jet engine, or a tow (for gliders). Lift comes from wings, which have a special curved shape called an airfoil. Lift is the force that gives an uneaven pressure balance on the wings, which forces an airplane up. Drag is air pushing back on an aeroplane which slows it down. Gravity is the weight of a plane
combating the lift by forcing the plane down. The Pioneers of Aviation The main pioneers of aviation were the Wright Brothers. They built the first aeroplane to actually fly with an engine. Then there was Lois Bleriot. He was the first person to fly across the English Channel. Did you know that he sold 800 of his Bleriot XI monoplanes? A father of aviation, Otto Lilienthal, created the most beutiful and succesful gliders. Unfortunately, he died in 1894 in a glider crash. The Bernoulli Principle The Bernoulli Principle is a scientiffic explanation for flight and some other things. It states that with a wing, the airfoil, faster moving air has lower pressure. Therefore on a wing, the curved shape on the top makes air on the top of the wing move faster to keep up with the air on the bottom of the wing, which moves slowly, thus creating higher pressure. The higher pressure forces the wing up. All the different types of engines! How a Jet Engine Works
An animated image of a jet engine to show how the air flows through the engine.
This is a picture of how the air flows through a jet engine.

Jet engines move the airplane forward with a great force that is produced by a tremendous thrust and causes the plane to fly very fast.

All jet engines, which are also called gas turbines, work on the same principle. The engine sucks air in at the front with a fan. A compressor raises the pressure of the air. The compressor is made up of fans with many blades and attached to a shaft. The blades compress the air. The compressed air is then sprayed with fuel and an electric spark lights the mixture. The burning gases expand and blast out through the nozzle, at the back of the engine. As the jets of gas shoot backward, the engine and the aircraft are thrust forward. Charles Yeager: My Aviator
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