The Test

Question 1

Three ways of decelerating an aircraft once it has landed?

Answer 1

Full flap
Brakes
Thrust Reverse 
Spoilers 
Parachutes

Question 2

What is flutter?

Answer 2

Causes wings and or stabilisers to oscillate

Question 3

Name the types of aerodynamic balance

Answer 3

Horn balance
Insert hinges 
Balance tabs
Spring tabs
Servo tabs

Question 4

Elevators attached to the horizontal stabiliser control what?

Answer 4

Pitch about the lateral axis

Question 5

Three types of drag?

Answer 5

Friction
Lift
Total

Question 6

Methods of improving directional stability

Answer 6

Add dorsal fin
Add a ventral fin
Extending the length of the fuselage
Increase the size of the fin

Question 7

Aircraft generally fly in?

Answer 7

Stratosphere

Troposphere

Question 8

Methods of boundary layer control?

Answer 8

Suction
Blowing
Vortex generators
Air jets

Question 9

Explain the function of vortex generators

Answer 9

Energise the boundary layer
Allows laminar air flow and transition point to extend back along aerofoil
Increasing lift and reducing drag

Question 10

Stagnation/total pressure

Answer 10

Static pressure + Dynamic pressure

Question 11

Sea level ISA values

Answer 11

Temp- 15*
Pressure- 1013 millibar
Density- 1.226 kg/m3

Question 12

Why is the Isa required?

Answer 12

Compare aircraft

Calibrate instruments

Question 13

ISA

Answer 13

International Standard Atmosphere

Question 14

Purpose of flaps

Answer 14

Change camber & AOA without changing wing angle or it’s attitude

Question 15

What angle of incidence is a wing attached to give the best L/D ratio

Answer 15

4*

Question 16

Normal cambered wing stalls at?

Answer 16

15-16* AOA

Question 17

Most effective combination of leading and trailing edge devices?

Answer 17

Slats & thrills slotted Fowler flaps

Question 18

Total reaction of an aerofoil in an air stream is affected by? 6

Answer 18

Density (p)
Velocity (v) of airflow
Wing area(s)
Angle of Attack(&)
Surface finish 
Aerofoil shape

Question 19

Benefits of a Fowler flap

Answer 19

Increase camber
Increase Alpha @ same attitude
Increase surface area
Energise boundary layer if slotted

Question 20

Ways in which roll stability can be achieved

Answer 20

High vertical tail fin
Sweep back
High wing or low CG
Dihedral

Question 21

Explain the purpose of

Anhedral wings?

Dihedral wings?

Answer 21

They both increase stability.

A- used to reduce +ve static lateral stability

Question 22

Define aspect ratio

Answer 22

Span/chord

The ratio of span to chord

Question 23

Rudders attached to the fin, control what?

Answer 23

Yaw, normal axis

Question 24

Ailerons attached to the wings, control what?

Answer 24

Roll about longitudinal axis

Question 25

Converging duct/ Venturi?

Answer 25

Dynamic pressure & velocity increasesincreases,

Question 26

The distance between the tips of the wings?

Answer 26

Span

Question 27

Wash out

Answer 27

The reduction in angle of incidence towards the tip.

Question 28

As angle of attack increases…

Answer 28

Total reaction increases together with lift and drag

Question 29

What is the boundary layer?

Answer 29

Thin layer next to surface, slowed by surface friction & viscosity

Question 30

How does boundary layer flow?

Answer 30

Laminar and becomes turbulent at the transition point

Question 31

Point at which air separates from the wing?

Answer 31

Separation point. No lift lots of drag

Question 32

How thick laminar layer

Answer 32

0.1-0.2

Question 33

Stall?

Answer 33

No further increased lift with increased AOA

Question 34

Negligible movement of CP with AOA on…

Answer 34

Symmetrical aerofoil

Question 35

Total reaction is

Answer 35

Lift & drag