11.1 Aerodynamics

Question 1

What is the main function of a stabilator?

Answer 1

Eliminate Mach tuck caused by shock wave formation

Question 2

What is the purpose of vortex generators?

Answer 2

They provide the boundary layer with additional energy to prevent flow separation

Question 3

What is the effect of pulling the control column rearwards?

Answer 3

Elevators deflect upward, aircraft nose up

Question 4

How do ailerons respond if the pilot rolls the aircraft to the left?

Answer 4

The aileron on the left wing moves up and the aileron on the right moves down

Question 5

How does area rule effect an aircraft’s transonic flight performance?

Answer 5

It reduces wave drag

Question 6

What are the two types of shock waves that are formed in supersonic flight?

Answer 6

Normal and oblique

Question 7

What happens to air temperature behind a shock wave?

Answer 7

The temperature rises

Question 8

Airflow behind a normal shockwave does what?

Answer 8

Decreases to subsonic

Question 9

Airflow behind an oblique shock wave does what?

Answer 9

Remains at supersonic but decreases a bit

Question 10

Where does velocity reduce and temperature increase?

Answer 10

Stagnation point

Question 11

What are the 4 flight controls on the wings?

Answer 11

. Slats
. Flaps
. Spoilers
. Ailerons

Question 12

What is the main function of the horizontal stabiliser?

Answer 12

Eliminate mach tuck

Question 13

Wha5 stalls first the lifting canard or wing?

Answer 13

Lift canard

Question 14

Control canards produce how much lift?

Answer 14

0%

Question 15

What angle is the control canard set to?

Answer 15

0%

Question 16

What is a boundary layer control at wing root?

Answer 16

Stall strip or wedge

Question 17

The ruddervator has two functions, what are they?

Answer 17

. If both surfaces moved simultaneously = elevator function
. If both surface moved oppositely = rudder YAW

Question 18

What is the most important control?

Answer 18

Pitch

Question 19

Why does the tip stall first on swept wing?

Answer 19

Spanwise flow

Question 20

How would you roll right?

Answer 20

Right aileron deflects up, left aileron deflects down.

Question 21

Subsonic air in flight is …….?

Answer 21

Incompressible

Question 22

Define the critical Mach number

Answer 22

The highest Mach number without being supersonic

Question 23

What is the lift increase for a plain flap?

Answer 23

55%

Question 24

What is the lift increase for a flower flap?

Answer 24

95%

Question 25

What is the lift increase for a slat?

Answer 25

35%

Question 26

When a supersonic airflow passes through a shock wave, what happens to temperature?

Answer 26

Temperature increases

Question 27

When a supersonic airflow passes through a shock wave, what happens to pressure and density?

Answer 27

Both increase

Question 28

When a supersonic airflow passes through a shock wave, what happens to velocity?

Answer 28

Decreases

Question 29

How do ailerons respond if pilot rolls the aircraft to the left?

Answer 29

Left aileron deflects upwards, right deflects down

Question 30

What percentage does a split edge flap increase lift by?

Answer 30

65%

Question 31

What percentage does a slotted flap increase lift by?

Answer 31

70%

Question 32

If nose goes upward what way does the trim tab deflect?

Answer 32

Down

Question 33

What control does a control canard allow?

Answer 33

Pitch control

Question 34

What do stall wedges allow?

Answer 34

Stalling at the root instead of tip

Question 35

What is a transonic profile also know as?

Answer 35

Rear loaded profile

Question 36

What do you use to correct the aircraft when the centre if pressure moves back causing Mach tuck?

Answer 36

Trimmable horizontal stabiliser

Question 37

What does an expansion wave do to supersonic airflow?

Answer 37

Increases the supersonic airflow speed