Chapter 11 - Aircraft Drag

Question 1

What are 2D Drags

Answer 1

Form

Skin Friction

Question 2

What are 3D Drags

Answer 2

Induced

Interference

Question 3

If you double IAS what happens to Parasite Drag

Answer 3

Goes up x4

Question 4

What is Total Drag - has x3

Answer 4

Interference, profile and induced

Question 5

Skin friction causes by the friction/ shear forces by the adjacent molecules in the boundary layer and we need to consider this over the whole?

Answer 5

Aircraft

Question 6

With parasite which way does the graph go

Answer 6

0 degrees up to the right in knots

Question 7

If we put flaps down which way does the parasite drag graph go

Answer 7

to the left from 0 degrees - thus making the airspeed slower

Question 8

Parasite is proportional to

Answer 8

V^2

Question 9

With induced drag which way does the graph go

Answer 9

Starts on the right and go up to the left corner - induced drag is high at low speeds

Question 10

If we add weight to induced drag which way does the graph go

Answer 10

Right - for a faster airspeed the drag will be as high

Question 11

Induced drag inversly proportional to

Answer 11

V^2

Question 12

If we double IAS what happens to induced drag

Answer 12

becomes a 1/4

Question 13

What happens to induced drag during a manoeuvre

Answer 13

increase

Question 14

Winglets, end plates and tip tanks all reduce induced drag how

Answer 14

increasing the distance around the tip therefore restricting the movement of pressure differentials

Question 15

A tip tank does what to form drag

Answer 15

Increases