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Principals Of Flight > Lift > Flashcards

Lift Flashcards

1
Q

Lift =

A

1/2p S V2 CL

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2
Q

Gravity constant is

A

9.81 m/s2 (rounded to 10 m/s2)

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3
Q

Mass is measured in

A

KG

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4
Q

How meany mm in 1M ?

A

1000

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5
Q

Feet in 1M

A

3.28

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6
Q

1nm = ? Feet

A

6080

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7
Q

1sm = ? Feet

A

5280

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8
Q

Work equation

A

Force x Distance

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9
Q

Force equation

A

Mass x Acceleration

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10
Q

Power equation

A

Work ➗ time

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11
Q

KE =

A

1/2 mV2

M= mass

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12
Q

TAS stands for

A

True Airspeed

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13
Q

CAS stands for

A

Celebrated Airspeed

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14
Q

EAS stands for

A

Equivalent Airspeed

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15
Q

How to you work out MACH NO#

A

TAS ➗ a

a is speed of sound 660 kts

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16
Q

How to you work out Dynamic Pressure?

A

Total pressure - static pressure

Is will give you IAS

17
Q

How do you Work out total Pressure?

A

Static Pressure + Dynamic Pressure

18
Q

Explain CAS?

A

CAS is IAS but more accurate as this takes into account position error. And is achieved by an accurate measurement of Dynamic Pressure of significance.

19
Q

Explain EAS

A

EAS is CAS but allows for the compressibility of air at highs speeds (usually above 300kts or at higher altitudes)

20
Q

1Km in m is?

A

1000

21
Q

What is the ISA assumed to be?

A 
15”c 
Pressure of 1013.15 hPa
Air density = 1.225 kg/m 3 
Laps rate of 1.98”c / 1000 ft to 36,090 ft
above that constantl temp is 56.5’c
22
Q

CL is the ratio between…

A

Lift per unit wing area and dynamic pressure.

23
Q

Airflow patter and thus lift and drag will depend on?

A

Angle of Attack

Aero foil thickness and camber

Air density

Velocity

24
Q

As AOA increases from -4* the leading edge stagnation point moves from…

A

Upper surface around leading edge to the lower surface.

25
Q

Where does the greatest positive pressure occur?

A

Leading edge stagnation point where relative flow velocity is 0

26
Q

Form (pressure) drag is the result of the pressure differential between …

A

The leading and trailing edge of the aerofoil.

27
Q

CD is the ratio between…

A

Drag per unit wing area and dynamic pressure

28
Q

Moment equation is…

A

Force x Distance

29
Q

Decreasing static pressure means

A

Decreasing air density

30
Q

Difference in kts and m/s

A

2 kts in 1 m/s

31
Q

As AOA increases what happens to low Pressure peak with CP

A

Moves forward

32
Q

CL of life formula is

A

Lift pressure ➗ Dynamic pressures

33
Q

CD is worked out as…

A

Drag pressure ➗ dynamic pressure

34
Q

For airflows less than M0.4 the AC is at what % of the cord?

A

25%

35
Q

2 ways changing the pitching moment can be considered?

A

Moving CP or through fixed AC

36
Q

What is Aerodynamic Centre (AC)

A

Fixed point on chordline where all changes in magnitude of lift effectively take place

37
Q

Glider L/D radio

A

25/60

38
Q

Airliner L/D ratio

A

12 to 20

39
Q

Single engine piston trainer L/D ratio

A

10 to 15

Principals Of Flight (9 decks)

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