How Airplanes Fly
By: Julian S


Basic idea of flight
Airplanes are heavier then air so they have to have characteristics of aerodynamics.
Airplanes have 3 features, a long narrow body called a fuselage, wings that extend from either side of the fuselage, and a tail. Airplanes fly because of the shape of their wings. The shape of the plane’s wings is called a airfoil. It’s a flat bottom with a curved top. When air flows over the top of the wing, it causes low pressure, which causes lift. When air flows across the bottom of the wing it also causes low pressure which causes more lift.

There are four forces that are associated with the flight of an airplane. Those are lift, weight thrust and drag.

The faster the airplanes fly’s the more lift. At higher speeds the air travels faster around the wing. Decreasing the high pressure around the top surface and increasing low pressure on the bottom surface.
julian644_air_flow_of_an_airfoil.gif
This picture shows a close up veiw of how the air flows around an airfoil.


Helping Factors in Flight

Many airplanes need propellers to help get the air that planes need to fly. There are also other ways to get that air, like jet engines, and some are still powered by rockets. All airplanes have sections on their wings called control surfaces. In the middle of the airplane there is something called a control stick. Which is used to move little parts on the back of the wings and tail to change direction to fly in different directions.

Angle of attack
The angle of attack is very important because the plane would not fly upwards without it. The angle of attack is the angle that the plane is pointed up.If there was no angle of attack the plane would not lift up into the sky.









julian644.png
This shows how the air flows over and around the airplane, and wings.


Julian644_Flight_basics.jpg
This picture shows how thrust, lift, drag, and gravity efect the plane.






Glossary

Fuselage: The body of an airplane.

Aerodynamics: a branch of dynamics that deals with the motion of air and other gaseous fluids and with the forces acting on bodies in motion relative to such fluids.

Airfoil:a body (as an airplane wing or propeller blade) designed to provide a desired reaction force when in motion relative to the surrounding air.


Citations;
How Do Airplanes Work?. Prod. The Entertainment Group. The Entertainment Group, 2004. Discovery Education. Web. 22 September 2011. <http://www.discoveryeducation.com/>.
airplane." Compton's by Britannica. Encyclopædia Britannica Online School Edition.
Encyclopædia Britannica, Inc., 2011. Web. 22 Sept. 2011.
<http://school.eb.com/comptons/article-230862>.