Drag Part 2

Question 1

What type of drag occurs when air meets at a junction?

Answer 1

Interference drag.

Question 2

What type of drag does fillets remove/reduce?

Answer 2

Interference drag.

Question 3

How do you reduce form drag?

Answer 3

Streamline.

Question 4

How do you reduce skin friction drag?

Answer 4

Smooth the surface.

Question 5

How do you reduce interference drag?

Answer 5

Fillets.

Question 6

How do you reduce induced drag?

Answer 6

Winglets.

Question 7

How induced drag proportional to velocity?

Answer 7

Id & 1/v^2

Question 8

What does the Coefficient of drag consist of?

Answer 8

Coefficient of parasite + coefficient of induced.

Question 9

How is coefficient of induced drag proportional to coefficient of lift?

Answer 9

CID & CL^2

Question 10

What type of speed characteristics are improved by winglets?

Answer 10

Low speed.

Question 11

Although tip tanks can reduce wingtip vortices, what type of drag is increased when they’re used?

Answer 11

Form drag.

Question 12

How do fences reduce trailing edge vortices?

Answer 12

Prevent spanwise flow.

Question 13

What do vortilons and strakes do?

Answer 13

The promote vortices, preventing spanwise flow.

Question 14

How does a vortex generator delay separation?

Answer 14

It induces energy from the free stream layer into the boundary layer.

Question 15

How is parasite drag and speed proportional?

Answer 15

Pd & v^2

Question 16

How do flaps effect induced drag?

Answer 16

It doesn’t.

Question 17

How do flaps affect trailing edge and wing tip vortices?

Answer 17

Increases trailing edge but decreases wing tip vortices.

Question 18

Whats it called where parasite drag and induced drag meet on a drag,speed graph.

Answer 18

Minimum drag speed.

Question 19

What number of minimum drag speed is the best for drag to speed ratio?

Answer 19

1.32.

Question 20

At speed stable, which is greater : drag or thrust?

Answer 20

Thrust.

Question 21

At speed unstable, which is greater : drag or thrust?

Answer 21

Drag.

Question 22

As mass increases, what happens to the VMD? (Minimum drag speed)

Answer 22

It gets faster.

Question 23

As flaps are extended what happens to the VMD?

Answer 23

It slows.

Question 24

As TAS increases, what happens to the mean drag curves’ position as altitude increase?

Answer 24

It moves to the right.

Question 25

What is gonna be the answer to most drag part 2 questions?

Answer 25

VMD.

Question 26

True or false : Assuming no flow separation, the strength of wing tip vortices increases as the angle of attack decreases.

Answer 26

Flase

Question 27

True or false : The strength of wing tip vortices increases as the aspect ratio increases

Answer 27

False.

Question 28

Wing tip vortices are (inversely/proportional) to aspect ratio?

Answer 28

Inversely proportional

Question 29

A reduction in induced drag means a blank upwash and a blank induced angle of attack.

Answer 29

Decrease and increase.

Question 30

True or false : Induced drag increases as angle of attack increases.

Answer 30

True.

Question 31

True or false : At constant load factor, induced drag decreases with increasing aeroplane mass.

Answer 31

False.

Question 32

An aircraft is in a steady climb to high altitude at a constant thrust setting. The autopilot is set to maintain constant vertical speed. The danger associated with this autopilot selection is:

Answer 32

Stall

Question 33

The coefficient of drag can be defined as the ratio of x pressure to x pressure.

Answer 33

Drag to dynamic

Question 34

Which drag components make up parasite drag?

1. pressure drag.
2. friction drag.
3. wingtip drag.
4. interference drag.

The combination that regroups all of the correct statements is:

Answer 34

124

Question 35

at speeds above the minimum drag speed, total drag increases/decreases.

Answer 35

Increases.

Question 36

If the aircraft’s mass changes, the VMD (1)_____ and the induced drag (2)_____. (Varies / remains constant)

Answer 36

Varies