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My Principles Of Flight > Revision > Flashcards

Revision Flashcards

1
Q

Convert feet into NM

A

1 ft = 6080nm

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2
Q

Convert Knots into M/s

A

X 0.5144 (approx half)

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3
Q

Define power

A

Power is the work actually being done by the airframe physically

Power = force x TAS

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4
Q

Define all 3 of Newtons Laws

A

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

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5
Q

Properties of air density

A

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

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6
Q

Lift equation

A

L = IAS2 x S x Cl

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7
Q

What is TAS

A

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

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8
Q

What is IAS

A

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

The airflow the aircraft is experiencing

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9
Q

Explain the different speeds

A

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

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10
Q

In 2D flow for therom what do we assume?

A

Ideal fluid

No viscosity
No compressability

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11
Q

What is bernoulli’s theroum

A

Total pressure = Static + Dynamic pressure

Total pressure must remain constant

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12
Q

Difference between chord and chord line

A

Chord = actual length of the distance from LE to TE

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

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13
Q

Thickness chord ratio?

A

Thickness chord ratio = max thickness / chord

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14
Q

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

A

25% between LE and TE

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15
Q

What affects coefficient of lift?

A

Camber
AOA
Thickness

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16
Q

Centre of pressure is affected by what?

A

AOA - angle of attack

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17
Q

What happens to CP on a cambered wing

A

CP will move with AOA

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18
Q

What is the best angle for lift and drag?

A

4 degree

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19
Q

What is profile drag?

A

Skin friction + Form drag

Skin friction is the particles slowing as they hit the fu

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20
Q

What are streamlines and stream tubes

A

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

21
Q

Difference between chord and chord line

A

Chord line is just a line. Linking LE-TE

Chord = actual distance

22
Q

What is thickness to chord (or fineness ratio)

A

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

Thickness chord ratio = max thickness / chord

23
Q

What is the taper ratio

A

Tip chord/root chord

24
Q

What is aspect ratio

A

Span2/area

Or span/mean aero chord

25
Q

What is the angle of incidence

A

The angle between wing root chord and longitudde axis

Think the intermediate stage to EAF

26
Q

Where to find CL/CD Max on drag polar

A

At tangent intercept

27
Q

Where to find CL/CD Max on drag polar

A

At tangent intercept

28
Q

What thickness is laminar flow in boundary layer

A

1-2mm

29
Q

What thickness is turb flow on boundary layer

A

1-2cm

30
Q

Before which point will laminar transistion to turb

A

A point before max thickness

31
Q

What type of flight is defined as 1g flight

A

Straight and level

32
Q

3 phases of a spin?

A

Incipient spin, fully developed spin, recovery

33
Q

What CG position will lead to a flatter spin?

A

A more AFT cg

34
Q

CS 23 /25 requirements

A

CS23 class B

Vs1 - 20% at 50ft
Vs0 - 30% at 50 ft

CS25 class A

Vsref- 23% at 50ft
Vr0 - 13% at 35 ft

35
Q

How to get VS regulated limited

A

94% of Vs1g = VS

36
Q

At what limits will stick pusher activate?

A

2% or 2knotd

37
Q

What will TE flap ext do to CP

A

Move it aft

38
Q

Why pitch down in ground effect?

A

Increased EAF on tailplane from main wing = less down force

39
Q

What happens in ground effect

A

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

40
Q

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

A

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

41
Q

CL prop to Cdi2

A

CL prop to Cdi2

42
Q

Calculate AOB?

A

AOB= TAS/10 + 7 degrees

43
Q

Radius of a turn

A

R = V2/Tan0 x Gravity

44
Q

Time to complete a turn?

A

2 x Pi x R = Distance

Then do speed = distance / time

Speed in M/S

45
Q

What is a rate 1 turn?

A

3 degrees per second

So 180 degrees in 1 minute

46
Q

Calculate rate of turn

A

TAS/Radius x 60

47
Q

What is VMP

A

Velocity maximum power

Best endurance speed

VMP is 0.76 of Vmd

48
Q

What is the best speed for glide range?

A

VMD

My Principles Of Flight (2 decks)

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