Drag

Question 1

What is the vertical component? (OL)

Answer 1

It is the lift and is used to support the weight of the airplane

Question 2

What is the horizontal component? (OD)

Answer 2

It is the drag

Question 3

List the two principle types of drag

Answer 3

1) Parasite Drag

2) Induced Drag

Question 4

What is a Parasite drag?

Answer 4

drag of parts of the airplane which doesn’t contribute to lift. Plus any lost of momentum of the airstream

Question 5

What are some parts of the airplane that does not contribute to lift?

Answer 5

1) Fuselage
2) Landing gear
3) Strunts
4) Antennas
5) wing tip
6) Fuel tank

Question 6

What are the two components of a parasite drag?

Answer 6

1) Form drag

2) Skin Friction

Question 7

What is form drag?

Answer 7

it is the drag created by the form or body as it resists motion through the air

Question 8

What is skin friction?

Answer 8

It is the tendency of airflow over a body to cling to its surface

Question 9

Can you eliminate a parasite drag completely?

Answer 9

No, but there are ways to reduce it

Question 10

How can you reduce skin friction?

Answer 10

Can reduce skin friction by the removal of dust, dirt, mud, or ice that has collected on the airplane

Question 11

What is interference drag?

Answer 11

Where the wing is attached to the fuselage or the struts of the wings

Question 12

What is induced drag?

Answer 12

It is cause by parts of the airplane that are active in producing lift

(wing)

Question 13

Can induced drag be eliminated?

Answer 13

No

Question 14

What happens with the induced drag and the angle of attack?

Answer 14

the induced drag increases when the angle of attack increases and decreases when the angle of attack decreases

Question 15

How can induced drag be reduce?

Answer 15

Induced drag can only be reduce during the initial designing of the airplane

Question 16

Which way those the air flowing over the top surfaces of the wing tend to flow?

Answer 16

inward

Question 17

Which way those the air flowing over the lower surfaces of the wing tend to flow?

Answer 17

outward and curl upward over the wing tip

Question 18

When the two airflows unite at the trailing edge which way are they flowing?

Answer 18

They are flowing contra-wise

Question 19

What forms when the two airflows unite at the trailing edge?

Answer 19

Eddies and vortices are formed which tend to unite into one larger eddy at each wing tip

Question 20

What are wing tip vortices?

Answer 20

are eddies and vortices that are formed and tend to unite into one larger eddy at each wing tip

Question 21

Does induced drag increase when the speed increases?

Answer 21

No

Question 22

What is the ground effect?

Answer 22

The ground effect is the reduced in he induced drag when an airplane is flown very near to the ground

Question 23

What is something that is effective in the reduced of induced drag?

Answer 23

winglets

Question 24

What is a winglet and how it is effective in reducing induced drag?

Answer 24

It is a small vertical surface of airfoil section. It is effective in producing side forces that diffuse the wing tip vortex flow