Revision

Question 1

Convert feet into NM

Answer 1

1 ft = 6080nm

Question 2

Convert Knots into M/s

Answer 2

X 0.5144 (approx half)

Question 3

Define power

Answer 3

Power is the work actually being done by the airframe physically

Power = force x TAS

Question 4

Define all 3 of Newtons Laws

Answer 4

1st - An object will remain at rest unless an external force is applied

2nd - An object will

3rd - every action has an equal and opposite reaction

Question 5

Properties of air density

Answer 5

Increase in alt = reducing density
Increasig Temp = reducing density
Increasing pressure = increasing density
Increasing humidity = less density

Question 6

Lift equation

Answer 6

L = IAS2 x S x Cl

Question 7

What is TAS

Answer 7

True airspeed is the speed at which the aircraft is flying through the air

Question 8

What is IAS

Answer 8

Indicated airspeed is the dynamic pressure of the air against the plane

The airflow the aircraft is experiencing

Question 9

Explain the different speeds

Answer 9

Remember Ice tea Pretty Cool Drink

IAS > correct for position error causing changes in dynamic pressure in pitot tube = CAS > correct for compressability = EAS > Correct for density = TAS

Question 10

In 2D flow for therom what do we assume?

Answer 10

Ideal fluid

No viscosity
No compressability

Question 11

What is bernoulli’s theroum

Answer 11

Total pressure = Static + Dynamic pressure

Total pressure must remain constant

Question 12

Difference between chord and chord line

Answer 12

Chord = actual length of the distance from LE to TE

Chord line = physical line keeping the middle of the wing shape

Question 13

Thickness chord ratio?

Answer 13

Thickness chord ratio = max thickness / chord

Question 14

Where can we find centre of pressure on a symetrical aerofoil?

Answer 14

25% between LE and TE

Question 15

What affects coefficient of lift?

Answer 15

Camber
AOA
Thickness

Question 16

Centre of pressure is affected by what?

Answer 16

AOA - angle of attack

Question 17

What happens to CP on a cambered wing

Answer 17

CP will move with AOA

Question 18

What is the best angle for lift and drag?

Answer 18

4 degree

Question 19

What is profile drag?

Answer 19

Skin friction + Form drag

Skin friction is the particles slowing as they hit the fu

Question 20

What are streamlines and stream tubes

Answer 20

StreAmlines show the path of a partical of air. In a steady air they can never cross.

Stream tubes are imaginary tubes made of streamlines there is no flow into or out of a tube wall only along

Question 21

Difference between chord and chord line

Answer 21

Chord line is just a line. Linking LE-TE

Chord = actual distance

Question 22

What is thickness to chord (or fineness ratio)

Answer 22

This is the ratio of the aerofoils maximum thickness compared to chord length expressed as a %

Thickness chord ratio = max thickness / chord

Question 23

What is the taper ratio

Answer 23

Tip chord/root chord

Question 24

What is aspect ratio

Answer 24

Span2/area

Or span/mean aero chord

Question 25

What is the angle of incidence

Answer 25

The angle between wing root chord and longitudde axis Think the intermediate stage to EAF

Question 26

Where to find CL/CD Max on drag polar

Answer 26

At tangent intercept

Question 27

Where to find CL/CD Max on drag polar

Answer 27

At tangent intercept

Question 28

What thickness is laminar flow in boundary layer

Answer 28

1-2mm

Question 29

What thickness is turb flow on boundary layer

Answer 29

1-2cm

Question 30

Before which point will laminar transistion to turb

Answer 30

A point before max thickness

Question 31

What type of flight is defined as 1g flight

Answer 31

Straight and level

Question 32

3 phases of a spin?

Answer 32

Incipient spin, fully developed spin, recovery

Question 33

What CG position will lead to a flatter spin?

Answer 33

A more AFT cg

Question 34

CS 23 /25 requirements

Answer 34

CS23 class B Vs1 - 20% at 50ft Vs0 - 30% at 50 ft CS25 class A Vsref- 23% at 50ft Vr0 - 13% at 35 ft

Question 35

How to get VS regulated limited

Answer 35

94% of Vs1g = VS

Question 36

At what limits will stick pusher activate?

Answer 36

2% or 2knotd

Question 37

What will TE flap ext do to CP

Answer 37

Move it aft

Question 38

Why pitch down in ground effect?

Answer 38

Increased EAF on tailplane from main wing = less down force

Question 39

What happens in ground effect

Answer 39

Downwash surpressee to EAF as a shallower angle. EAOA decreases induced increases = greater lift

Question 40

At a LF of 1 and aeroplanes minimum drag speed what is ratio of induced and parasite drag?

Answer 40

Di/Dp = 1 ... this is where they both cross over to create Vmd

Question 41

CL prop to Cdi2

Answer 41

CL prop to Cdi2

Question 42

Calculate AOB?

Answer 42

AOB= TAS/10 + 7 degrees

Question 43

Radius of a turn

Answer 43

R = V2/Tan0 x Gravity

Question 44

Time to complete a turn?

Answer 44

2 x Pi x R = Distance Then do speed = distance / time Speed in M/S

Question 45

What is a rate 1 turn?

Answer 45

3 degrees per second So 180 degrees in 1 minute

Question 46

Calculate rate of turn

Answer 46

TAS/Radius x 60

Question 47

What is VMP

Answer 47

Velocity maximum power Best endurance speed VMP is 0.76 of Vmd

Question 48

What is the best speed for glide range?

Answer 48

VMD