Chapter 2: Aerodynamics Flashcards Preview

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Flashcards in Chapter 2: Aerodynamics Deck (25)
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1

The four forces acting on an airplane in flight are

lift, weight, thrust and drag

2

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

During unaccelerated flight

3

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

Lift equals weight and thrust equals drag

4

Airplanes climb because of ___?

excess thrust

5

Lift acts at a ___ degree angle to relative wind.

90 degree

6

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

stall

7

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

airspeed indicator

8

The chord line is an imaginary line connecting the

leading edge of the wing with the trailing edge

9

The chord line is used to represent

the general shape of the wing

10

The definition of chord enables us to understand

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

11

Relative wind results from the motion of the

airplane through the air

12

Relative wing is called relative because it

results from the motion of the airplane

13

Relative wind is ___ and ___ to the airplanes motion

opposite to, equal

14

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

independent of

15

The term "angle of attack" is defined as the angle

between the wing chord line and the relative wind.

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

different from

17

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

direction of the relative wind

18

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

horizontal

19

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

upward

20

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

less

21

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

decrease

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

top, less

23

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

upward

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.

acceleration.

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.

downward.