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M8 > M8 > Flashcards

M8 Flashcards

1
Q

What is acceleration due to gravity

A

9.8 m/s

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2
Q

What unit donates force

A

Newtons N

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3
Q

Where does static pressure act

A

Equally in all directions

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4
Q

What is static pressure denoted by

A

A small p

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5
Q

What is dynamic pressure denoted by

A

A small q

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6
Q

What is static pressure for technical systems denoted by

A

Bar

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7
Q

What must temperature be expressed in

A

Kelvin

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8
Q

Why has an effect on the speed of sound

A

Temperature

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9
Q

What happens to the speed around the aircraft in the transonic region

A

Some areas are above the speed of sound and others are below

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10
Q

What distance is the troposphere from the earth?

A

8km at the poles and 16km at the equator

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11
Q

Which layer of atmosphere is the lowest

A

Troposphere

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12
Q

What is the standard altitude for the tropopause

A

11km

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13
Q

Under standard conditions, temperature decreases with an altitude at a rate of 6.5 degrees per km

A
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14
Q

What is the standard temp in the tropopause

A

56.5 degrees

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15
Q

Which region is the air incompressible

A

Subsonic

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16
Q

What does the continuity equation denote

A

The speed of the airflow is inversely proportional to the area of the cross section of the tube as long as the density remains constant

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17
Q

Why term is used in an outlet when the diameter increases no the speed decreases

A

Diffuser outlet

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18
Q

Why does the Bernoulli equation state

A

The total pressure is always the sum of static pressure and dynamic pressure

19
Q

What a a profile

A

A cross section of a wing

20
Q

What is the chord line

A

A straight line drawn half way between the leading edge and the trailing edge

21
Q

What is the mean camber line

A

Drawn half way between the upper service and lower surface

22
Q

What is the fineness ratio

A

Maximum thickness of a profile as a fraction

23
Q

What is angle of attack denoted by

A

Alpha

24
Q

What is the symbol for angle of incidence

A

Gamma

25
Q

What is the taper ratio

A

From the tip of the chord to the root chord

26
Q

What is the aspect ratio

A

Wing span divided by average chord

27
Q

Out of positive dihedral and negative dihedral which is up and which is down

A

Positive is up and negative is down

28
Q

What is induced drag caused by

A

Lift and spa wise flow

Cured by using fairings

29
Q

What is the equation for the coefficient of lift

A

Measured lift divided by theoretical lift

30
Q

Where is the centre of pressure

A

The point where all the pressures and forces act

31
Q

What happens the more swept back the wings are

A

The more table the aircraft around the roll axis

32
Q

Lift is what to the relative wind

A

Perpendicular

33
Q

Drag is what to the relative wind

A

Parllel

34
Q

What is the equation for coefficient of lift

A

Measured lift over theoretical lift

35
Q

What is critical Mach no

A

The lowest Mach number part of it starts going supersonic

36
Q

What is a polar diagram

A

Polar curve show how lift and drag coefficients combine

37
Q

What are the 3 types of parasite drag

A
  • Form
  • Friction
  • interference
38
Q

What type of compressible drag is there

A

Shock waves

39
Q

When does induced drag affect

A

Lift

40
Q

Where does a swept wing stall first

A

The tip

41
Q

What is washing out

A

Aerodynamically twisting the wing to prevent the tip stalling first and stalling the root, making safer flying conditions

42
Q

What is the centre of pressure

A

Also the centre of lift is the point where the total sum of a pressure field acts on a body

43
Q

What is mean aerodynamic chord

A

The average chord length of a tapered or swept wing

M8 (2 decks)

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