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Module 8 > 8 > Flashcards

8 Flashcards

1
Q

4 fundamentals in aerodynamics?

A

Mass, Length, Time and Temperature

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2
Q

Symbol for speed?

A

V

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3
Q

Formula for speed?

A

Speed = Distance / Time

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4
Q

Symbol for acceleration?

A

a

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5
Q

Formula for acceleration?

A

Acceleration = Change in velocity/Time taken

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6
Q

Symbol for acceleration due to gravity?

A

G

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7
Q

What is the average acceleration due to gravity?

A

9.8ms*2

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8
Q

What is acceleration measured in?

A

Metres per square second

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9
Q

Calculation for weight?

A

Weight = Mass x Acceleration due to gravity

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10
Q

Calculation for work?

A

Work = Force x Distance

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11
Q

What is Work measured in?

A

Newton metres or Joules

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12
Q

Calculation for Force?

A

Force = Mass x Acceleration

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13
Q

What is Force measured in?

A

Newton’s

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14
Q

What is the measurement for Power?

A

Watts/Newton metres per second

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15
Q

Calculation for Power?

A

Power = Force x Distance
———————
Time

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16
Q

What is the unit for work?

A

Joules (J)

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17
Q

What is the symbol for static pressure?

A

p

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18
Q

What is the formula for pressure?

A

Pressure = Force/Area

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19
Q

What is static pressure?

A

Static pressure acts equally in all directions

20
Q

What is dynamic pressure?

A

Dynamic pressure acts only in the direction of flow

21
Q

What is the symbol for dynamic pressure?

A

q

22
Q

What is the symbol for the speed of sound?

A

a

23
Q

What is the formula to calculate the speed of sound?

A

Speed of sound = 20 x (sq. root of T(Kelvin))

24
Q

What is the constant used in the formula for the speed of sound?

A

20

25
Q

What is a diffuser outlet?

A

When diameter increases and speed decreases

26
Q

What is a jet outlet?

A

Diameter decreases and speed increases

27
Q

What is Bernoulli’s principle?

A

Total pressure is always the sum of static pressure and dynamic pressure. The total pressure remains constant.

28
Q

What is the point of stagnation?

A

The speed of the airflow falls to zero and the static pressure equals the total pressure.

29
Q

Where is up-wash experienced?

A

At the leading edge of the wing

30
Q

Where is down-wash experienced?

A

At the trailing edge of the wing

31
Q

What is the Magnus Effect?

A

A rotational cylinder creates an increased local speed on the top and decreased on the bottom

32
Q

How do vortices form?

A

They form in pairs, rotating counter clockwise

33
Q

What is a profile?

A

A cross-sectional area of a wing

34
Q

What can a wing and profile section also be called?

A

Aerofoil and Aerofoil Section

35
Q

What is the camber?

A

The camber of the profile is the displacement of the mean camber line from the chord line.

36
Q

What camber would you find on a typical low speed profile aerofoil?

A

A minimum camber at 5% located 45% aft of the leading edge

37
Q

What is the Fineness Ratio?

A

The maximum thickness of a profile defined as a fraction

38
Q

What thickness would you find on a typical low speed profile?

A

A typical low speed profile might have a maximum thickness of 18% located 30% aft of the leading edge.

39
Q

What is the Angle of Attack?

A

Symbol is alpha - The angle between the chord line and the relative wind

40
Q

What is the Angle of Incidence?

A

Symbol is Gamma - the angle between the chord line and the longitudinal axis of the aircraft

41
Q

How do you calculate wing area?

A

Wing span x Wing chord

42
Q

What is the symbol for the Taper Ratio?

A

Lambda

43
Q

What is the Taper Ratio?

A

It is the ratio between the tip chord and the root chord (Ct/Cr)

44
Q

What is the aspect ratio?

A

The wing span divided by the average chord

45
Q

What is the sweep angle?

A

The sweep angle is the angle between the line of 25% chords and a line perpendicular to the root chord.

46
Q

Which direction does a positive sweep go?

A

Backwards

47
Q

What is the dihedral angle?

A

When the wing tip is either above or below the horizontal plane

Module 8 (1 decks)

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