EO M231.02 Lift

TP5 Types of Airfoils

­-Wing designs and airfoils come in various shapes and sizes each specialized to perform a certain way for different aircraft

TP4 & TP5 Confirmation

1. What is the Angle of Attack?

2. A Wing is a type of ________ because of ________

3. As the air on top of the wing is faster its has less ________

4. The "Critical Angle of Attack" produces ______ _______

Give me a pro and con for each airfoil and what type of airplane its used on

1. Deep Camber

2. Low Camber

3.Low Lift

TP4 Angle of Attack

-A wing is a type of airfoil because of its cross­sectional shape, the top is curved while the bottom is mostly flat

-As the air on top goes faster the pressure decreases on top of the wing the air below has a slower speed which has more pressure. (High to low concentration)

-The angle under the wing which encounters the air is call the wing’s Angle of Attack The bigger angle of attack the more lift the wings will generate

-The critical angle of attack is the angle of attack which produces maximum lift. This is also called the "stall angle of attack''

Extra Cool Stuff

TP2 & TP3 ­Bernoulli’s Principle

TP2 ­Bernoulli’s Principle

TP3 Exploring Bernoulli’s Principle

Activity:

­Bernoulli’s Principle states that the total energy in a system remains constant

The pressure of moving air can be seen by blowing gently over a small piece of curved paper. The air does not push the paper down as assumed.

Instead, the paper behind the curve rises toward the moving air. This happens because the air pressure drops over the paper due to the air’s increased speed –

this would seem to match the description

-We take advantage of Bernoulli’s Principle to use ­Newton’s third law and apply it in flight

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-Air is a lot like a fluid and a fluid has energy in the form of speed and pressure

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-As speed increases the pressure drops, a wing uses this principle to deflect air which causes equal and opposite reaction

-Speed increases, pressure decrease and it works the other way around

Confirmation

TP1 & Review

1. What is Newton's First Law?

2. What is Newton's Second Law?

3. What is Newton's Third Law?

4. What is Bernoulli's Principle?

5. As speed increases what decreases?

What are the four forces that act on an aircraft in flight?

The Four Forces:

-Lift

-Weight

-Thrust

-Drag

Lift: Created by the wing due to airflow

Weight: Mass of the aircraft & gravity

Thrust: Produced by the engine

Drag: Air resistance

TP1 Air and Newton's Three Laws

Newton's Three Laws:

1. Anything in motion stays in motion unless acted on

2. F=ma (Force equals mass times acceleration)

3. For every action there is a equal and opposite reaction

Objective: By the end of the lesson you should be able to describe the production of lift by an aircraft wing

-Air is a gaseous fluid so it follows Newton's first law, if acted upon then it will lead to Newton's second law

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-Newton's second law requires that a force must be applied to change the air's motion

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-Newton's third law is crucial to flight. It allows the wing through applying a force that changes the motion of air to develop lift through opposite and equal reaction

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-Air has mass and it is very important in flight, it has enough mass to allow an aircraft to fly.

Importance: It is important for cadets to learn the production of lift so that they can develop an understanding of the principles of flight.

EO M231.02 Lift

MTPs

-­Air and Newton’s First Law

­-Bernoulli’s Principle

­-Explore Bernoulli’s Principle

­-Angle of Attack

­-Types of Airfoils

2x30min Sgt. Weng