Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Mod 11 > 11.1 - Theory of Flight > Flashcards

11.1 - Theory of Flight Flashcards

Theory of Flight

1
Q

Which form of drag is reduced by boundary layer control?

A

Induced Drag

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

which of the statements is true?

A

Spoiler and speed brakes always reduce lift and increase drag

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How are the Leading edge devices deployed?

A

By the same lever as flap deployment.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Regarding aerodynamic heating. which material looses 80% of its strength at 250c

A

Aluminium Alloys

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What can be said about changes in velocity, pressure and density in a shock wave?

A

Changes occur suddenly and sharply

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What happens to the airflow as an aircraft approaches the speed of sound?

A

Areas of supersonic airflow increases and shockwaves move closer to the trailing edges.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the increase in lift provided by the slat system?

A

35%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

When does the boundary layer loose control with the surface?

A

When kinetic energy in boundary layer is too low.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the critical Mach number

A

The point at which local airflow reaches Mach 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

When is a control surface correctly balanced

A

When the centre of gravity of the surface is located on the hinge line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is done to prevent extreme pressures and temps at the engine compressor during high speed flight

A

1 normal and 3 oblique shockwaves are formed to slow airflow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the disadvantage of an antibalance trim tab

A

The pilot requires more effort to deflect the control surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which tab system uses a lever

A

Control tab type

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How is profile thickness expressed in aerodynamics

A

as a relationship between actual thickness divided by chord length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the name of the most effective flaps

A

Fowler flap

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the main function of the stabilator

A

Eliminate Mach Tuck caused by a shockwave formation

17
Q

What is the purpose of ailerons

A

Roll control

18
Q

Which primary flight controls effect the yaw control of the aircraft

A

Rudder

19
Q

Which type of tab arrangement increases the effectiveness of a control surface

A

Anti-balance tab

20
Q

Which of the following materials would generally be used to resist aerodynamic heating

A

Titanium alloy

21
Q

How does supersonic flight effect the air

A

The air is compressible

22
Q

If a mach indicator shows a number of 0.6. What does it mean

A

The aircraft is flying at 60% the speed of sound

23
Q

Which of the following statements, regarding transonic flight is correct

A

Local Mach number is more than the flight Mach number

24
Q

If the right ruddervator goes down and the left goes up.

A

The aircraft yaws right

25
Q

How much does the fowler flap increase lift by more than other lifting devices

A

95%

26
Q

What is the Subsonic speed range

A

Mach numbers less than 0.8

27
Q

What is the transonic speed range

A

Mach numbers from 0.8 to 1.2

28
Q

What is the supersonic speed range

A

Mach numbers between 1.2 to 5.0

29
Q

When flying above Mach 1, an oblique shock wave is formed. What happens to air passing through it

A

As it passes the wave, the velocity is reduced but remains supersonic. Causing slight increase in temperature and pressure

30
Q

When is an expansion wave formed

A

When supersonic airflow changes direction around a curve or corner, away from the preceding flow direction

31
Q

How does the Center of lift/pressure chord position differ between subsonic and supersonic flight

A

At supersonic speeds the centre of lift is approximately 50% chord position

At subsonic speeds the centre of lift is approximately 25%

32
Q

What is the portion of total drag due to shockwaves called

A

Wave drag

33
Q

What is the function of a vortex generator

A

Transference of energy from the free airstream to the boundary layer to reduce flow separation

34
Q

How does supersonic airflow act in a Venturi

A

It acts opposite to subsonic flow due to nozzle chokes the air and increases pressure

35
Q

What is the disadvantage of a swept back wing

A

Increases span wise airflow

Mod 11 (21 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions