Part 3- Four Forces Of Flight

Question 1

What is the relationship of the relative wind to the flight path?

Answer 1

The relative wind is directly opposite the flight path of the aircraft

Question 2

How do airfoils create lift?

Answer 2

Airfoils cause comparatively greater air pressure on the bottom surface of the wing than on the upper surface, creating lift

Question 3

All other factors being equal, what happens to lift as an airfoil moves faster through the air?

Answer 3

More lift is generated

Question 4

How can pilots use the wing to increase lift?

Answer 4

Lower the flaps and increase the angle of attack

Question 5

Which type of flap is attached to the wing by a hinge and changes the upper camber of the wing?

Answer 5

Plain flap

Question 6

What force acts vertically towards the center of the earth?

Answer 6

Weight

Question 7

How does changing the thickness of a propeller from root to tip affect thrust?

Answer 7

The airfoils shape at the root provides maximum thrust at the low rotational speeds that occur near the hub and a thin, flat airfoil provides maximum thrust at the tip

Question 8

What is skin friction drag?

Answer 8

Drag caused by the roughness of the airplanes surfaces

Question 9

Induced drag added to parasite drag results in

Answer 9

Total drag

Question 10

Which of the following statements accurately describes L/Dmax?

Answer 10

L/Dmax is the airspeed for maximum efficiency, and determines how far the airplane can glide horizontally from any given height above the terrain

Question 11

What problem could ground effect cause during takeoff?

Answer 11

An overloaded or improperly configured airplane may take off and fly, but be incapable of climbing out of ground effect

Question 12

How does l/Dmax relate to airplane performance?

Answer 12

L/Dmax provides maximum gliding distance and fuel economy for an airplane

Question 13

What is interference drag?

Answer 13

Drag created when the air flowing around one part of the airplane interacts with air moving at a different speed or in a different direction around an adjacent part of the airplane

Question 14

What is the purpose of flaps when landing?

Answer 14

To maintain lift at slow airspeeds for a safer landing

Question 15

Which of the flowing best describes critical angle of attack?

Answer 15

The angle of attack that, if exceeded, causes the airplane to stall regardless of its airspeed, flight attitude or weight

Question 16

How does Newton’s third law of motion apply to lift?

Answer 16

As the airfoil forces air downward, the wing is pushed upward in response to

Question 17

The angle of attack is the angle between the

Answer 17

Chord line and relative wind

Question 18

Newton’s third law of motion states that

Answer 18

Every force exerted by one body on another is accompanied by an equal force in the opposite direction

Question 19

The apparent force that results from inertial resistance to a turn is

Answer 19

Centrifugal force

Question 20

How do you correct a slip

Answer 20

Decrease the amount of ball or increase the rate of turn by applying more rudder pressure in the direction of the turn

Question 21

During a turn of you increase the airspeed and maintain the angle of bank, the rate of turn will decrease and the radius will

Answer 21

Increase

Question 22

The lift to drag ratio

Answer 22

Determines the gliding efficiency of an airplane

Question 23

What force causes a left turning tendency in response to the clockwise rotation of the propeller

Answer 23

Torque

Question 24

How does gyroscopic precession create a left turning tendency

Answer 24

When the airplane pitches down, a force is applied to the top of the propeller and a resultant forage causes the airplane to yaw to the left

Question 25

What will the load factor be while making a turn and maintaining a constant altitude

Answer 25

More than 1g

Question 26

Maneuvering speed increases as the aircraft

Answer 26

Weight increases

Question 27

What is one way to correct a skid

Answer 27

Apply less rudder pressure in the direction of the turn

Question 28

What determines the gliding efficiency of an airplane

Answer 28

The lift to drag ratio

Question 29

At a given weight, l/dmax corresponds to a certain airspeed called

Answer 29

The best glide speed

Question 30

The four factors that cause a left turning tendency in a propeller driven aircraft are torque, p-factor, gyroscopic precession

Answer 30

Spiraling slipstream

Question 31

When an airplane pitches down, gyroscopic precession causes the airplane to

Answer 31

Yaw left

Question 32

How does spiraling slip stream cause left turning tendency

Answer 32

The spiraling slipstream strikes left side of the vertical tail and the resulting force yaws the nose to the left

Question 33

Load factor can change with

Answer 33

Turbulence

Question 34

Why is it necessary to increase the angle of attack by increasing back pressure on the control struck in a level turn

Answer 34

The vertical component of lift decreases in a level turn and the increase in the angle of attack is required to maintain lift

Question 35

What happens to stall speed when load factor increases

Answer 35

Stall speed increases

Question 36

How does p factor create a left turning tendency

Answer 36

When the airplane is flying at high angles of attack the different angles of attack between the ascending and descending propeller blades create asymmetrical thrust causing the airplane to yaw to the left

Question 37

The area above can on the v-g diagram represents the

Answer 37

Region of structure damage

Question 38

As the aircraft weight decreases

Answer 38

The maneuvering speed decreases