Chapter 2: Aerodynamics Flashcards Preview

Rod Machado's Private Pilot Workbook > Chapter 2: Aerodynamics > Flashcards

Flashcards in Chapter 2: Aerodynamics Deck (25)
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1
Q

The four forces acting on an airplane in flight are

A

lift, weight, thrust and drag

2
Q

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

A

During unaccelerated flight

3
Q

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

A

Lift equals weight and thrust equals drag

4
Q

Airplanes climb because of ___?

A

excess thrust

5
Q

Lift acts at a ___ degree angle to relative wind.

A

90 degree

6
Q

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

A

stall

7
Q

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

A

airspeed indicator

8
Q

The chord line is an imaginary line connecting the

A

leading edge of the wing with the trailing edge

9
Q

The chord line is used to represent

A

the general shape of the wing

10
Q

The definition of chord enables us to understand

A

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

11
Q

Relative wind results from the motion of the

A

airplane through the air

12
Q

Relative wing is called relative because it

A

results from the motion of the airplane

13
Q

Relative wind is ___ and ___ to the airplanes motion

A

opposite to, equal

14
Q

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

A

independent of

15
Q

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

A

between the wing chord line and the relative wind.

16
Q

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

A

different from

17
Q

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

A

direction of the relative wind

18
Q

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

A

horizontal

19
Q

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

A

upward

20
Q

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

A

less

21
Q

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

A

decrease

22
Q

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

A

top, less

23
Q

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

A

upward

24
Q

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.

A

acceleration.

25
Q

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.

A

downward.