Lesson 2

Question 1

What are the two scientific factors produce lift on a wing?

Answer 1

1. Bernoulli’s Principle
2. Newton’s 3rd Law

Question 2

What is Bernoulli’s Principle?

Answer 2

When the velocity of a fluid increases, the pressure of that fluid decreases

Question 3

Explain Bernoulli’s Principle in relation to a wing

Answer 3

The curved surface of a wing causes the air on top of the wing to move faster than the bottom; this leads to lower pressure on the top of the wing and higher pressure under the wing, causing the wing to press upwards which is lift.

Question 4

What are ways to increase the lift on a wing?

Answer 4

1. Increase airspeed, which increases the speed of the wind going over the wing.
2. Change the shape of the wing - i.e. lower Flaps
3. Increase the Angle of Attack - i.e. pitch up

Question 5

What is the lift equation?

Answer 5

L= 1/2 pvvSCl

where:
p is the air density,
v is the velocity of the air relative to the wing (airspeed),
S is the wing area,
Cl is the coefficient of lift, which is a dimensionless number depending on the wing shape and angle of attack.

or 1/2 * air density * velocity squared * wing area * (wing shape + AoA)

Question 6

What three types of wind will affect the air going over a wing?

Answer 6

1. Acceleration/Plane’s speed
2. Prop Wash
3. Natural Wind

Question 7

What is Newton’s Third Law?

Answer 7

For every action, there is an equal and opposite reaction

Question 8

How does Newton’s Third Law affect a wing?

Answer 8

When the wing increases it’s angle of attack (to a certain point), more relative wind hits the underside of the wing, pushing it up (and back)