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Aerodynamics > Exam > Flashcards

Exam Flashcards

1
Q

Definition of a straight line representation of a velocity

A

Length is proportional to speed using a fixed scale.

Direction is determined

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2
Q

Definition of Energy of a body

A

Capacity to do work

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3
Q

Kinetic energy definition

A

The energy a body possesses by virtue of its motion proportional to velocity KE = 1/2mv^2

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4
Q

Potential energy definition

A

The energy a body possesses by virtue of its position in a Force field = energy stored

PE =mgh

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5
Q

Gas definition

A

A group of molecules that aren’t bonded

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6
Q

Gas density

A

The measure of the number of particles per volume

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7
Q

Density of gas is a function of :

A

Temperature

Pressure

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8
Q

Camber definition

A

Max distance between the chord line and the mean camber line
Measured perpendicular to the chord line
%

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9
Q

Chord line definition

A

A straight line joining the centres of curvature of the leading edge and trailing edges

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10
Q

Relative air flow definition

A

The relative direction and speed of the air before it is influenced by the presence of the aircraft

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11
Q

Stall definition

A

AoA exceeds critical angle

Decrease in lift due to decreased pressure on top of wing

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12
Q

Thrust definition

A

Engine generates power and the propellor generates thrust by accelerating a mass of air

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13
Q

Temperature increases

A

Decrease density of gas

Increase kinetic energy

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14
Q

As pressure increases

A

Increase density of gas

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15
Q

What is static stability

A

Immediate reaction of a body disturbed by an external force

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16
Q

What is dynamic stability

A

Subsequent reaction of a body disturbed by an external force

17
Q

Symptoms of the stall

A 
High attitude 
Reducing airspeed 
Stall warning 
Less effective controls 
Buffet 
Stall followed by uncommanded pitch down
18
Q

Stall recovery is

A

Reduce AoA

Increase velocity

19
Q

What are two types of drag

A

Zero lift drag

Lift dependent / induced drag

20
Q

Specific fuel consumption definition

A

Amount of fuel burnt divided by the amount of fuel produced

Jets - SFC = FF/Thrust
Turboprop - SFC = FF/SHP

21
Q

TOR(R)

A

Take off run required

Length of ground roll aircraft requires to accelerate from a standing start to speed to fly

22
Q

TORA

A

Take off runway available

Length of runway available for the ground run of an aircraft taking off

23
Q

TOD(R)

A

Take off distance required

Distance required for an aircraft to accelerate from a standing start and climb to a screen height

24
Q

TODA

A

Take off distance available

Distance available for an aircraft to achieve screen height
Includes TORA + stop way + clear way

25
Q

ASDA

A

Accelerate stop distance available

TORA + any stopway

26
Q

What factors increase take off distance

A 
Weight
Pressure altitude 
Tailwind 
Temperature 
Surface
Slope
27
Q

Climb gradient

A

Distance travelled vertically divided by distance covered across the ground

28
Q

What factors need to be considered when calculating landing performance for an aircraft

A 
Aircraft weight
Airfield altitude 
Air temperature 
Runway surface conditions 
Runway slope 
50% HW 150% TW
29
Q

Effects of engine failure

A 
Safety implications 
Alters specific air range and specific ground range 
Decrease airspeed 
Decrease operating ceiling 
Decrease performance
30
Q

Asymmetric flight

A

50% power lost
80% performance lost

Steady flight achieved:

  • engine shut down and feather
  • gear and flap retract
  • 5 degree bank toward live engine
  • limitation of bank angle
31
Q

Ice formation on aerofoil surfaces and fuselage

A

Increase thrust required and stall speed

32
Q

Frost on wings and tail surface

A

Take off run and stalling speed increase

33
Q

Not clearing frost from wings before flight

A

Indicated stalling speed increases

34
Q

Accumulating clear ice on aeroplane in flight

A

Increase stalling speed

35
Q

Rime ice hazard

A

May block pitot tube

Aerodynamics (1 decks)

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