M8 Aerodynamics Flashcards

1
Q

Disadvantages of swept wings

A

Reduces lift, swept wings need to be longer, has to be heavier

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2
Q

How’s lift created

A

Created as velocity of air is taken over the wing and therefore the static pressure above the wing decreases when the static pressure below stays the same so there for the pressure below is higher than above which causes lift to occur

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3
Q

What’s the Magnus affect

A

When an cylinder rotates which then increases the speed on the upper surface which then cause# lift due to the static pressure now being lower on top

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4
Q

What’s the mean camber line

A

The curved line that sits halfway between the upper and lower surface

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5
Q

What factors affect lift

A

Icy conditions
Angle of attack
Thickness of profile
Camber line

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6
Q

Earths average atmospheric pressure ?

A

14.7 psi or 1013Hpa

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7
Q

How do you calculate wing area

A

Wingspan x chord

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8
Q

How do you calculate Mach number

A

Speed of aircraft divided by speed of sound

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9
Q

What’s centre of pressure

A

The centre point from where all pressure/force is said to act from

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10
Q

Factors that affect drag

A

Angle of attack and if the aircraft is at a climb

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11
Q

What’s the stratosphere

A

The point from where temperature no longer changes and there are no more clouds

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12
Q

What’s the difference between positive and negative sweep wings

A

Positive wings are facing backwards whereas negative wings are facing forwards

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13
Q

Advantages of swept wings

A

Provides stability
Good for aircraft that want to fly at speeds close to speed of light or over

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14
Q

How does altitude affect the speed of sound

A

The higher the altitude the slower the speed of sound because as the altitude gets greater the temperature decreases which slows down the speed of sound

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15
Q

What’s the difference between subsonic, transonic and supersonic

A

Subsonic is travelling at speeds up to critical Mach
Transonic is the speed of the aircraft that’s travelling at the speed of sound
Supersonic is the speed of the aircraft that’s exceeding the speed of sound

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16
Q

What’s critical Mach

A

Critical Mach is the speed an aircraft can travel at without any parts of the plane exceeding the speed of sound

17
Q

Average world temp in Kelvin

18
Q

Average air density

A

1.224 kg/m cubed

19
Q

What’s the formula for theoretical lift

A

P divided by 2 x v squared x a

20
Q

What’s the angle of incidence

A

Angle between cord line and longitudinal axis of aircraft

21
Q

What’s the angle of attack

A

The angle between the chord line and the relative wind

22
Q

How do you work out dynamic pressure

A

One half x density x speed squared

23
Q

How do you work out Static pressure

A

Density x height x gravity

24
Q

Difference between a anhedral and dihedral

A

Dihedral is when the wing tips are higher than the wing base
Anhedral is when the wing base is higher than the wing tips

25
What’s air called that’s taken up from the leading edge? What’s air called that’s discharged from trailing edge?
Upwash Downwash
26
What’s a cord line
The line that goes from the leading edge to the trailing edge
27
What’s fineness ratio
The maximum thickness of a profile expressed as a ratio or a percentage
28
What’s relative wind
The speed and direction of the air acting on an aircraft which it’s passing through
29
What are the two components of aerodynamic forces
Drag and lift
30
What part of atmosphere does weather occur in
Troposphere
31
How far up is the stratosphere from sea level
11km
32
How much does temperature drop by as you go up a km
6.5
33
What happens to static pressure as dynamic increases
Static pressure must decrease and vice versa
34
What’s the stagnation point
The point where velocity of airflow is 0
35
What type of wave is a sound wave
Longitudinal