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081 Principles of Flight > The Basics > Flashcards

The Basics Flashcards

1
Q

What’s the unit for mass?

A

Kg

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2
Q

What’s the unit for Force?

A

Newton (N) force that accelerates 1Kg at 1m/sec^2

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3
Q

What’s the unit for Time?

A

Seconds

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4
Q

What’s the unit for Distance?

A

Metres

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5
Q

What’s the unit for Area?

A

Metre squared m^2

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6
Q

What’s the unit for Velocity?

A

m/sec

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7
Q

What’s the unit for acceleration?

A

m/sec^2

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8
Q

What’s the unit for Temperature?

A

Kelvin (K)

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9
Q

What’s the unit for pressure?

A

Pascal (Pa): a pressure of 1 N/m^2

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10
Q

What’s the unit for density?

A

Kilograms per cubic metre Kg/m^3

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11
Q

What’s the unit for Energy?

A

Joule = 1 N moving 1 metre

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12
Q

What’s the unit for power?

A

Watt (w): a rate of energy use of 1J/sec

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13
Q

How much is an hectopascal?

A

100 pascals = 1mb

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14
Q

How much is 1 Kg weight into N?

A

9.81 N

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15
Q

What’s Newton’s First Law?

A

A body will continue in a state of rest or uniform motion unless acted on by an external force

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16
Q

What’s Newton’s Second Law?

A

the rate of change of momentum of a body is proportional to the applied force, and takes place in the direction in which the force acts

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17
Q

What’s Newton’s Third Law?

A

to every action there is an equal and opposite reaction

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18
Q

What are the gas laws?

A

1st: Boyle’s law: at a fixed temperature, increasing pressure will decrease the volume and thus increase the density

2nd: Charle’s law: at a fixed pressure, increasing the temperature will increase the volume and thus decrease the density

3rd: Pressure law: at a fixed volume, increasing temperature or pressure will increase the other factor.

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19
Q

What’s the formula when we combine these ideal gas laws together?

A

Density=P/RT

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20
Q

What’s an adverse pressure gradient?

A

An area where the airflow is moving from low to high pressure

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21
Q

What’s the anhedral?

A

The DOWNWARD angling of the wing, root to tip

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22
Q

What’s the boundary layer?

A

A layer of air next to the aircraft skin slower than the free stream air

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23
Q

What’s the camber?

A

The shaping of the airfoil to improve lift coefficient

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24
Q

What’s the chord line?

A

The line joining the front of the airfoil to the back

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25
Q

What the coefficient of rolling moment?

A

Roll moment is a moment, which is a product of a force and a distance, that tends to cause a vehicle to roll, that is to rotate about its longitudinal axis

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26
Q

What’s the Centre of Gravity?

A

The point through which the aircraft weight acts

27
Q

What’s the Centre of Pressure?

A

Point through which lift and drag act

28
Q

What’s the Critical alpha?

A

Stall angle, the angle of attack where Coefficient of lift stops increasing

29
Q

What’s the dihedral?

A

The upward angling of the wing, root to tip

30
Q

What’s the dihedral?

A

The UPWARD angling of the wing, root to tip

31
Q

What’s EHP?

A

Engine shaft horsepower, the power delivered by the engine to the propeller

32
Q

What’s form drag?

A

An element of drag due to the form or shape of an object

33
Q

What’s incidence?

A

The angle between the airfoil chord line and the aircraft longitudinal axis

34
Q

What’s induced drag?

A

Extra drag induced by the need to generate lift

35
Q

What’s intereference drag?

A

An element of drag due to intereference in the airflow round wing/fuselage and other junctions

36
Q

What’s the leading edge stagnation point?

A

The point where the airflow comes to rest at the wing leading edge

37
Q

What’s the load factor?

A

The lift in manoeuvre divided by lift in level flight, or weight

38
Q

What’s the longitudinal dihedral?

A

The difference between the wing and tail angles of incidence

39
Q

What’s the Mean Camber line?

A

The line joining points equidistant from the top and bottom sufaces of an airfoil

40
Q

What’s Q?

A

Dynamic prsesure element

41
Q

What’s R?

A

Reynolds number, a non-dimensional sacle factor for airflow calculations

42
Q

What’s RAF?

A

Relative Airflow

43
Q

What’s RAS?

A

Rectified Airspeed

44
Q

What’s SAR?

A

Specific Air Range, miles flown in still air over fuel used

45
Q

What’s the separation point?

A

The point where the boundary layer separates from the airfoil surface and streamline flow breaks down

46
Q

What’s the service ceiling?

A

The altitude at which rate of climb has fallen to 100ft/min (propeller) or 500 ft/min (jet)

47
Q

What’s SFC?

A

Specific Fuel consumption, fuel used over power or thrust produced

48
Q

What’s skin friction?

A

An element of drag due to friction in the boundary layer

49
Q

What’s the stagnation point?

A

The point where the airflow is brought to rest and pressure equals total head pressure

50
Q

What’s STOL?

A

Short Takeoff and landing

51
Q

What’s the taper ratio?

A

The ratio of the root chord to the tip chord

52
Q

What’s the thickness/chord ratio?

A

The ratio or aerofoil thicness to chord length, expressed as a percentage

53
Q

What’s the THP?

A

Thrust horsepower, the power delivered by a propeller

54
Q

What’s the trailing edge stagnation point?

A

The point where the airflow comes to rest at the wing trailing edge

55
Q

What’s the transition point?

A

The point where the boundary layer changes from laminar to turbulent flow

56
Q

What’s the trim drag?

A

The extra drag cause by the tail forces needed to trim the aircraft

57
Q

What’s the trim point?

A

The angle of attack where the aircraft is in trim

58
Q

What’s V1?

A

Take-off decision speed

59
Q

What’s V2?¿

A

Take-off safety speed

60
Q

What’s Vsw?

A

The speed at which the onset of the natural or artificial stall warning occurs

61
Q

What’s Vx?

A

Best angle of climb IAS

62
Q

What’s Vy?

A

Best rate of climb IAS

63
Q

What’s the wash in?

A

Increase in incidence at the wing tip

64
Q

What’s the washout?

A

Reduction in incidence at the wing tip, makes the wing root stall sooner than the wingtip

081 Principles of Flight (24 decks)

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