Chapter 2: Aerodynamics

Question 1

The four forces acting on an airplane in flight are

Answer 1

lift, weight, thrust and drag

Question 2

When are the four forces that act on an airplane in equilibrium?

Answer 2

During unaccelerated flight

Question 3

What is the relationship of lift, drag, thrust and weight when an airplane is in straight-and-level flight?

Answer 3

Lift equals weight and thrust equals drag

Question 4

Airplanes climb because of ___?

Answer 4

excess thrust

Question 5

Lift acts at a ___ degree angle to relative wind.

Answer 5

90 degree

Question 6

The minimum forward speed of the airplane is called the ___ speed.

Answer 6

stall

Question 7

You can best determine the proper climb attitude for your airplane by referring to the

Answer 7

airspeed indicator

Question 8

The chord line is an imaginary line connecting the

Answer 8

leading edge of the wing with the trailing edge

Question 9

The chord line is used to represent

Answer 9

the general shape of the wing

Question 10

The definition of chord enables us to understand

Answer 10

the angle the wind meets a wing that may very in size and shape

Question 11

Relative wind results from the motion of the

Answer 11

airplane through the air

Question 12

Relative wing is called relative because it

Answer 12

results from the motion of the airplane

Question 13

Relative wind is ___ and ___ to the airplanes motion

Answer 13

opposite to, equal

Question 14

Relative wind is ___ which way the airplane’s nose is pointed

Answer 14

independent of

Question 15

The term “angle of attack” is defined as the angle

Answer 15

between the wing chord line and the relative wind.

Question 16

An important principle to understand when dealing with angle of attack is that the nose (therefore the wing) can be pointed on an uncle thats ___ the actual climb path

Answer 16

different from

Question 17

Angle of attack is defined as the angle between the chord line of an airfoil and the

Answer 17

direction of the relative wind

Question 18

Wings are expressively build to plow through air molecules separating them either above or below while offering little resistance in the ____ horizontal

Answer 18

horizontal

Question 19

Wind deflected downward by the airfoil creates a/an____movement of the wing

Answer 19

upward

Question 20

Bernoulli figured out that the father the air flows over a surface, the ___pressure it exerts on that surface

Answer 20

less

Question 21

Air flowing faster over a curved surfaces causes a slight____ in pressure on that surface

Answer 21

decrease

Question 22

High velocity airflow over the wing causes a slight decrease in pressure on the wings upper surface. In other words, the pressure on __ of the wing is now __ than the pressure on the bottom of the wing

Answer 22

top, less

Question 23

Since high pressure always moves toward low pressure, the wing (which just happens to be in the way) is pushed ___.

Answer 23

upward

Question 24

Because the wing’s shape, even at a very small angle of attack, a cambered wing still adds a slight curve and ___ to the wind.

Answer 24

acceleration.

Question 25

At a relatively slow speed (such as during takeoff), the wing’s engineered curve into capable of curving or deflecting enough air ___ to produce the necessary lift for flight.

Answer 25

downward.