Published bySophia Harrison Modified over 7 years ago
How flight works presentation By Blaise and Nick
4 Forces - Lift Lift is the force that acts against the weight of the plane and moves the plane in the air. Flight is effected because this makes the airplane go higher. Lift happens when a moving flow of air is turned by an airfoil, which holds the airplane in the air. The flow of air is controlled and aimed in a certain direction, and then lift is generated. The airfoil splits the air flow in two directions, low air pressure and high air pressure.
4 Forces - Drag Drag is the force that acts against the movement of the plane. Drag is the opposite of thrust. It will pull the plane back in the direction of the airflow. Drag is the resistance of the thrust of the plane.
4 Forces - Weight Weight is the force of gravity pulling the aircraft down. The gravity of the Earth is pulling the aircraft down. The aircraft must overcome this force to be able to reach higher altitudes. The weight of an airplane changes during the flight because the plane’s fuel is being used during the flight causing a change in the weight.
4 Forces - Thrust Thrust is the force that moves straight, or sends the aircraft forward. Thrust is crucial for flight to commence. Thrust overcomes the drag of the airplane (and weight of a rocket). Thrust is made by engines all around the plane. The engines used are called a propulsion system. The propulsion engine takes wind from the front, and shoots it out the back at a higher speed.
Air Foil - Bernoulli’s Principal
Bernoulli’s Principal is a formula created by David Bernoulli. The equation expresses how the plane can lift up by the shape of its wings. The wings are shaped so the air goes faster above the wing, and slower below. This creates air pressure, which will lift the plane into the air. Fast traveling air creates low air pressure, and slow moving air creates high pressure. The shape of the wing divides the pressures into two different the directions. The low goes up and down the curved top of the wing, and the high will go straight until they rejoin again. These two pressures will lift the plane in the air, creating lift. The principal can be used for other activities, like paper airplanes as long as the air foil is following the design.
Size and Shape of the Air Foil
The amount of lift generated depends on how much the high pressure (the air on the top of the wing) is turned. When the air splits, passes, and rejoins this creates a upward movement, or lift. When the air splits, passes, and rejoins this creates a upward movement, or lift. Without the airfoil shape, an aircraft would not be able to go in the sky. An air foil is needed for flight because it helps liftoff, and going higher. The bigger the size of the air foil, the more lift generated, but if its too heavy it will be impractical for it to work because it would weigh down the aircraft. Different types of airfoils or surfaces will change the way flight is created, and change them in the way some pilots want their air craft changed. The surface of the shapes effect lift and drag tremendously. Whether it is flat, concave, or convex, flight can be changed in many ways. Curved bottom sides will have the high pressure not rejoin with the low, withholding lift. However flat bottoms add lift, allowing the pressures to rejoin.
Work Cited Thrust: Lift: Drag: Weight: Air Foil - Bernoulli's Principal: Size and Shape:
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